Consulta: subjectFacets:"Precision farming"
Registros recuperados: 51
Data/hora: 02/06/2024 02:08:45

Application of x-ray computed tomography in the evaluation of soil porosity in soil management systems
Provedor de dados: 70
Autores: Beraldo,José M. G.; Scannavino Junior,Francisco de A.; Cruvinel,Paulo E.
The study aimed to evaluate a methodology to quantify the porosity of the soil using computed tomography in areas under no-tillage, conventional tillage and native forest. Three soil management systems were selected for the study: forest, conventional tillage and no-tillage. In each soil management system, undisturbed soil samples were collected in the surface layer (0.0 to 0.10 m). The tomographic images were obtained using a X-ray microtomography. After obtaining the images, they were processed, and a methodology was evaluated for image conversion into numerical values. The statistical method which provided the greatest accuracy was the percentile method. The methodology used to analyze the tomographic image allowed quantifying the porosity of the soil...
Tipo: Info:eu-repo/semantics/other
Palavras-chave: Precision farming; Image processing; X-ray microtomography; Macroporosity.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162014000600012

Metodologias de tratamento de dados georreferenciados e correlação entre as variáveis de solo, planta e produtividade.
Provedor de dados: 14
Autores: KRAHL, L. L.; SHIRATSUCHI, L. S.; RESENDE, A. V. de.
bitstream/CPAC-2009/26917/1/p2005_70.pdf
Tipo: Fôlder / Folheto / Cartilha (INFOTECA-E)
Palavras-chave: Georreferenciamento; Precision farming; Geoprocessing.; Agricultura de Precisão; Fertilidade do Solo; Glycine Max; Soja.; Soybeans.; Soil fertility.
Ano: 2006
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/569523

Conceitos e considerações práticas do sistema de geração de mapas de produtividade na cultura de grãos.
Provedor de dados: 14
Autores: SHIRATSUCHI, L. S.
ABSTRACT: Precison Agriculture adoption is increasing on savannas region in the central plain areas in Brazil, principally because fertilizers and others pesticides were saved reducing the cost of grain production in the agricultural areas. But environmental pollution with these products area also become a problem. It was estimated that the are with variable rate tax of fertilizers in brazilian agricultural areas is about on million hectare, this is quarter of no till system broadcast area in the Savannas Region. But Precision Agriculture tools are unknown by a lot of farmers and technicians and one of these tools that make possible Precision Agriculture adoption is the yield map generation with monitors. This guideline aims farmers and agricultural...
Tipo: Documentos (INFOTECA-E)
Palavras-chave: Mapeamento; Precision farming; Harvest monitor.; Agricultura de Precisão; Colheita; Rendimento.; Cartography; Harvesting; Yield monitoring; Yields.
Ano: 2004
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/569192

Aplicação localizada de herbicidas.
Provedor de dados: 14
Autores: SHIRATSUCHI, L. S.; CHRISTOFFOLETI, P. J.; FONTES, J. R. A.
ABSTRACT: Curent interest in site-specific weed control considering the weed spatial variability is increasing nowadays, when economical and environmental aspects are considered. This paper reviews the patch spraying methods for herbicides application systems regarding the economical and technical aspects. Using this new approach high herbicides savings are possible, maintaining the efficacy of chemical control using the site-specific herbicide applications, and consequently reducing the environmental impact of the broadcast application of herbicides.
Tipo: Documentos (INFOTECA-E)
Palavras-chave: Planta daninha; Precision farming; Agricultural chemicals.; Agricultura de Precisão; Defensivo; Controle Químico; Herbicida; Pulverização.; Chemical control; Herbicides; Spraying; Weeds.
Ano: 2003
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/568141

Amostragem em Grid e imagens aéreas: métodos para estudos da distribuição espacial de corós em soja sob plantio direto no cerrado.
Provedor de dados: 14
Autores: OLIVEIRA, C. M. de; VILELA, M. de F.; SHIRATSUCHI, L. S.; ABDALLA, R. P.; VIEIRA, A. L. N.
bitstream/CPAC-2009/26812/1/p2005_20.pdf
Tipo: Fôlder / Folheto / Cartilha (INFOTECA-E)
Palavras-chave: Pests of plants; Precision farming; Natural distribution.; Agricultura de Precisão; Glycine Max; Inseto; Praga de Planta; Soja.; Insecta; Soybeans.
Ano: 2006
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/569439

Classificação não-supervisionada no delineamento de zonas de manejo.
Provedor de dados: 14
Autores: SHIRATSUCHI, L. S.; QUEIROS, L. R.; FACCIONI, G. C.
RESUMO: O objetivo deste trabalho foi utilizar o método de classificação não-supervisionada (fuzzy K-means) em dados de produtividade para delineamento de zonas de manejo. O estudo foi conduzido a partir de dados georregerenciados de produtividade de grãos coletados por sensores e DGPS. Foram mapeadas três safras (milho-soja-arroz) em área de plantio direto irrigada por pivô central. Os dados de produtividade foram interpolados pelo inverso da distância resultando em um mapa de resolução espacial de 5 x 5 m. Os valores relativizados em relação à média de produtividade foram comparados ao longo do tempo nos mesmos locais. Como referência, foram escolhidas três classes de produtividade para delinear as zonas de manejo segundo os seguintes critérios:...
Tipo: Boletim de Pesquisa e Desenvolvimento (INFOTECA-E)
Palavras-chave: Fuzzy kmeans; Precision farming; Productivity.; Agricultura de Precisão; Mapa; Produtividade.; Cartography; Yield mapping.
Ano: 2005
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/570016

Geração de mapas de produtividade para experimentos com milho no âmbito de fazenda.
Provedor de dados: 14
Autores: SHIRATSUCHI, L. S.
ABSTRACT: Many farmers do not use precision agriculture tools due to high equipment costs and lack of knowledge about this new approach. A number of farmers have, however, conducted on-farm experiments without the help of these new and still expensive tools. One of most important equipments for precision agriculture practices is the crop yield monitor. It can also be used for on-farm experiments to collect yield data, reducing costs and paybacks. The aim of this paper is to evaluate the effects of combine header distance on corn harvest accuracy of yield maps. Conventional yield map was statistically compared with five maps generated by removing 2, 4, 6, 8 e 10 combine header width generated by a GIS-based software package. Two interpolations were made, i....
Tipo: Comunicado Técnico (INFOTECA-E)
Palavras-chave: Interpolação; Precision farming; Maize; Interpolation; Productivity.; Agricultura de Precisão; Mapa; Milho; Produtividade; Zea Mays.; Cartography.
Ano: 2003
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/568680

Mapeamento da distribuição espacial de plantas daninhas na cultura da soja por meio de sensoriamento remoto.
Provedor de dados: 14
Autores: VILELA, M. de F.; FONTES, J. R. A.; SHIRATSUCHI, L. S.
RESUMO: Não existe, atualmente, maneira prática e rápida de geração de mapas de distribuição espacial de plantas daninhas para aplicação localizada de herbicida, e o emprego de fotografias aéreas não convencionais com esse fim tem sido discutido. O objetivo deste trabalho foi avaliar o uso de fotografias aéreas não convencionais para mapear a distribuição e o nível de infestação por plantas daninhas, visando ao manejo localizado. As fotografias aéreas, obtidas a uma altitude de vôo média de 300 metros, possibilitaram a confecção de um mosaico aerofotogramétrico que foi posteriormente georreferenciado e classificado, gerando um mapa de distribuição e de níveis de infestação por plantas daninhas. Esse mapa foi comparado aos dados de referência, coletados na...
Tipo: Boletim de Pesquisa e Desenvolvimento (INFOTECA-E)
Palavras-chave: Planta daninha; Levantamento florístico; Precision farming; Weed survey.; Agricultura de Precisão; Glycine Max; Soja.; Soybeans; Weeds.
Ano: 2005
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/570352

Correlação da distribuição espacial do banco de sementes de plantas daninhas com a fertilidade dos solos.
Provedor de dados: 14
Autores: SHIRATSUCHI, L. S.; FONTES, J. R. A.; RESENDE, A. V.
bitstream/CPAC-2009/25291/1/p2004_18.pdf
Tipo: Fôlder / Folheto / Cartilha (INFOTECA-E)
Palavras-chave: Planta daninha; Mapeamento; Distribuição espacial; Mapping; Precision farming; Natural distribuition.; Agricultura de Precisão; Fertilidade do Solo; Erva Daninha; Semente.; Soil fertility; Seeds; Weeds.
Ano: 2005
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/568290

Conceitualização de um sistema de suporte à decisão para o dimensionamento e manejo de pivô central em condições de irrigação de precisão.
Provedor de dados: 14
Autores: RODRIGUES, L. N.; PRUSKI, F. F.; AZEVEDO, J. A. de; SILVA, E. M. da.
RESUMO: Embora a água seja um dos principais componentes de produção a afetar a produtividade das culturas, sua variabilidade dentro da área irrigada é frequentemente ignorada. Acredita-se que isto seja devido à falta de instrumentos confiáveis para sua medição em tempo real como, por exemplo, aqueles existentes para medição de nitrogênio. Nota-se que há, nesta área do conhecimento, uma grande oportunidade para utilização de modelos computacionais, os quais são usualmente utilizados no dimensionamento e manejo de sistemas de irrigação e que, agora, poderão ser utilizados na geração de mapas de umidade do solo, os quais poderão auxiliar o projetista no momento de interpretar os mapas de rendimento. O objetivo do presente trabalho foi apresentar a...
Tipo: Boletim de Pesquisa e Desenvolvimento (INFOTECA-E)
Palavras-chave: Escoamento superficial; Irrigation equipment; Precision farming; Infiltration water.; Agricultura de Precisão; Água; Evapotranspiração; Infiltração; Irrigação; Pivô Central; Solo.; Evapotranspiration; Soil.; Runoff.
Ano: 2005
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/571365

Correlação entre índice de cone e produtividade de milho utilizando ferramentas da agricultura de precisão.
Provedor de dados: 14
Autores: MACHADO, T. M.; SHIRATSUCHI, L. S.; SÁ, M. A. C. de; CORAZZA, E. J.
bitstream/CPAC-2009/26821/1/p2005_27.pdf
Tipo: Fôlder / Folheto / Cartilha (INFOTECA-E)
Palavras-chave: Mapeamento; Maize; Productivity; Precision farming; Soil compactation.; Agricultura de Precisão; Compactação do Solo; Milho; Produtividade; Zea Mays.; Cartography.
Ano: 2006
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/569260

Grades amostrais para fins de mapeamento da fertilidade do solo em área de cerrado.
Provedor de dados: 14
Autores: RESENDE, A. V.; SHIRATSUCHI, L. S.; SENA, M. C.; KRAHL, L. L.; OLIVEIRA, J. V. F.; CORRÊA, R. F.; ORO, T.
bitstream/CPAC-2009/27858/1/p2006_71.pdf
Tipo: Fôlder / Folheto / Cartilha (INFOTECA-E)
Palavras-chave: Georreferenciamento; Precision farming; Geoprocessing.; Agricultura de Precisão; Fertilidade do Solo; Mapa.; Cartography; Soil fertility.
Ano: 2006
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/570296

Procedimento para estimativa da intensidade de precipitação máxima admissível em pivô-central com base nas características do equipamento e do solo.
Provedor de dados: 14
Autores: RODRIGUES, L. N.; PRUSKI, F. F.; SILVA, E. M. da.
ABSTRACT: A procedure to estimate the center pivot maximum application rate, based on equipment and soil characteristic is presented. It was developed to minimize the surface runoff. To achieve this objective, the Green and Ampt (GA) infiltration equation was modified to include surface sealing and surface storage. The highest application rate is determined by solving a system of equations which incout to application rate and its derivative and the GA and its derivative. Sensitivit analysis showed that the procedure represented adequately the variation in the main parameters that interfere in the value of the maximum application rate. This methodology can be used to desing the optimum center pivot irrigation system for given combination of soil, climate...
Tipo: Documentos (INFOTECA-E)
Palavras-chave: Escoamento superficial; Interceptação; Armazenamento superficial; Precision farming; Surface runoff; Infiltration water; Plant cover; Interception; Superficial storage.; Agricultura de Precisão; Água; Cobertura Vegetal; Infiltração; Irrigação; Pivô Central; Solo.; Agriculture; Irrigation; Soil; Water management.
Ano: 2003
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/567998

Comparação de modelos receptores GPS para utilização na agricultura de precisão.
Provedor de dados: 14
Autores: SHIRATSUCHI, L. S.; ZIVIANI, A. C.; MARTINS, F. da S.
ABSTRACT: After the liberation of Selective Availability (S/A) several GPS receivers started to have enough accuracy or precision for work with grid sampling in Precision Agriculture. There are few articles describing the accuracy and precision of these receivers. The objective of this work was compared and calculated the accuracy of two models very used for grid sampling in Brazil. The study was done in a flat surface, common in the Cerrados region. The geographical reference was determined by DGPS collecting data for 10 hous. The tested models (Garmin GPSIII Plus and Garmin etrex Vista) were evaluated for 5 days in the period of 7 a.m. to 17 p.m. The concept of Circular Error Probability (CEP) was uded for the accuracy and precision calculation. The...
Tipo: Comunicado Técnico (INFOTECA-E)
Palavras-chave: GPS; Precision farming; Circular error probality.; Agricultura de Precisão.
Ano: 2004
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/569252

Mapeamento da distribuição espacial de plantas daninhas na cultura de soja por meio de sensoriamento remoto.
Provedor de dados: 14
Autores: VILELA, M. de F.; FONTES, J. R. A.; SHIRATSUCHI, L. S.
bitstream/CPAC-2009/26814/1/p2005_21.pdf
Tipo: Fôlder / Folheto / Cartilha (INFOTECA-E)
Palavras-chave: Planta daninha; Precision farming; Natural distribution.; Agricultura de Precisão; Glycine Max; Mapa; Soja.; Cartography; Soybeans; Weeds.
Ano: 2005
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/569440

Agricultura de precisão: possibilidades de manejo da adubação nitrogenada para o milho no Cerrado.
Provedor de dados: 14
Autores: HURTADO, S. M. C.; RESENDE, A. V. de; SILVA, C. A.; CORAZZA, E. J.; SHIRATSUCHI, L. S.
Altas produtividades de milho são dependentes da interação de fatores como clima, solo e manejo. O manejo da adubação nitrogenada é um dos principais condicionantes da produtividade, pela complexa dinâmica do nitrogênio (N) nos sistemas agrícolas. É com base nessa dinâmica que se busca estimar o potencial de suprimento de N pelo solo e o seu aproveitamento pela cultura, o que possibilita definir as recomendações de adubação. Contudo, a maioria das variáveis que influencia a necessidade de N na adubação pode mudar no espaço e no tempo, como é o caso das características edafoclimáticas que interferem no potencial de suprimento do nutriente pelo solo. Assim, para se refinar o manejo da adubação nitrogenada, é preciso considerar a sua variabilidade espacial e...
Tipo: Documentos (INFOTECA-E)
Palavras-chave: Fertillidade do solo; Adubação nitrogenada; Precision farming; Maize; Zero tillage.; Agricultura de Precisão; Cerrado; Milho; Plantio Direto; Zea Mays.; Nitrogen fertilizers; Soil fertility.
Ano: 2008
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/556775

Geração de mapas multitemáticos em agricultura de precisão.
Provedor de dados: 14
Autores: SHIRATSUCHI, L. S.; MARCHÃO, R. L.; JERKE, C.; RESENDE, A. V.; FONTES, J. R. A.; OLIVEIRA, C. M.; VILELA, M. de F.; SÁ, M. A. C. de; SANTOS JÚNIOR, J. de D. G. dos; HURTADO, S. M. C.
RESUMO: O objetivo deste trabalho foi delinear uma metodologia de geração de mapas multitemáticos para o apoio à tomada de decisão nas culturas de grãos, considerando a abordagem integrada e hierarquizada dos fatores que interferem na produtividade. A área foi mapeada para os atributos da fertilidade do solo, nutrição de plantas, plantas daninhas e estande de plantas, sendo colhida com colhedora equipada com sensores de produtividade, umidade e GPS para a geração de mapas de produtividade. Utilizou-se a análise de componentes principais (ACP) com o intuito de correlacionar a produtividade das culturas com a disponibilidade dos nutrientes do solo e planta, infestação de plantas daninhas e estande. Os três maiores fatores que interferiram na produtividade,...
Tipo: Boletim de Pesquisa e Desenvolvimento (INFOTECA-E)
Palavras-chave: Precision farming; Productivity.; Agricultura de Precisão; Mapa; Milho; Produtividade; Soja; Tomada de Decisão.; Cartography; Decision making.
Ano: 2007
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/572273

IDENTIFICATION OF AGRONOMIC MANAGEMENT UNITS BASED ON PHYSICAL ATTRIBUTES OF SOIL
Provedor de dados: 126
Autores: Cucunubá-Melo,J.L; Álvarez-Herrera,J.G; Camacho-Tamayo,J.H.
Oil palm (Elaeis guineensis Jacq) is an alternative for the development of productive systems in the tropics. By determining the spatial variability of physical characteristics of soil, specific recommendations for certain areas within a zone can be made. Geostatistical analysis can determine the existence and characteristics of the spatial distribution and is an appropriate tool for analyzing the spatial variability of soil properties. The aim of this study was to determine areas with homogeneous physical characteristics in order to establish agricultural management units, using geostatistical techniques. For this study, 62 samples were collected in 10.6 ha in the municipality of El Reten (Magdalena, Colombia). The properties analyzed were: content of...
Tipo: Journal article
Palavras-chave: Geoestatistics; Semivariogram; Kriging; Precision farming; Elaeis guineensis Jacq.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-95162011000100008

マニュアスプレッダの堆肥散布機構と散布精度
Provedor de dados: 19
Autores: 申, 宝明; 佐藤, 禎稔; 岸本, 正; 谷, 昌幸; 仙北谷, 康; 加藤, 拓; 林, 芙俊; SHEN, Baoming; SATOW, Tadatoshi; KISHIMOTO, Tadashi; TANI, Masayuki; SENBOKUYA, Yasushi; KATO, Taku; HAYASHI, Futoshi.
マニュアスプレッダによる堆肥の散布精度の現状を把握することを目的とし，横軸ピータ型，縦軸ビータ型，左側方散布型の3機種を対象として堆肥の散布量分布および 堆肥散布精度の調査を行った。各機種の散布量分布は，いずれも山型の形状を示しており，横軸ビータ型，縦軸ピータ型では，マニュアスプレッダの中心から左右1m以内に，それぞれ全体の76%，40%が散布され，左側方散布型は左側3-5mの範囲に全体の71%が集中して散布された。最大散布畳は横軸ビータ型が2.3t/l0a，縦軸ビータ型が6.5t/10a，左側方散布型が10.3t/l0aとなり，重複散布しても規定散布量である2t/l0aが望めない結果となった。また，圃場全体の堆肥散布量は各機種で0.2-3.4t/lOa，2.4-22. 8t/l0a，0.6-5.0t/10aであり， 堆肥の性状によって散布むらが大きくなることが判明した。The purpose of this study was to investigate the present situation of compost spreading with manure spreaders in Tokachi region. Therefore，three different types of manure spreaders: rear horizontal beater type(A)，vertical beater type (B) and side discharge type (C)，were used to determine the application pattern and accuracy of compost spreading. Application pattern of each...
Palavras-chave: 堆肥の利用; マッピング; 炭素循環; 精密農法; Utilization of compost; Mapping; Carbon cycle; Precision farming.
Ano: 2010
URL: http://ir.obihiro.ac.jp/dspace/handle/10322/2701

EVALUATING THE RETURNS TO VARIABLE RATE NITROGEN APPLICATION
Provedor de dados: 31
Autores: Roberts,   Roland K.; English,   Burton C.; Mahajanashetti,   S.B.
Potential benefits of variable rate nitrogen application are illustrated and information needs identified. Lower costs of precision farming services, higher crop prices, and greater divergence in yield response potentials across management zones reduce the spatial variability required for profitable variable rate application. Information needs include identification and measurement of management zones within a field and estimation of management zone yield response functions, crop and input prices, and the cost of precision farming services.
Tipo: Journal Article
Palavras-chave: Production economics; Management zones; Nitrogen; Precision farming; Spatial break-even variability proportions; Variable rate applications; Yield response variability; Crop Production/Industries.
Ano: 2000
URL: http://purl.umn.edu/15393

Will Variable Rate Application Technology Pay in Tennessee?
Provedor de dados: 31
Autores: Cochran,   Rebecca L.; Larson,   James A.; Roberts,   Roland K.; English,   Burton C.
Costs differ among variable rate application systems.  Most feasible in Tennessee are the 1-bin and 2-bin spreader beds mounted to existing chassis with an owner-added variable rate controller and global positioning system.  Truck spreader systems required more acreage or larger custom charges making it difficult to breakeven and earn a profit.
Tipo: Conference Paper or Presentation
Palavras-chave: Cotton; Grid soil sampling; Precision farming; Site-specific information; Variable rate application; Research and Development/Tech Change/Emerging Technologies.
Ano: 2004
URL: http://purl.umn.edu/34678

Socioeconomic Profiles of Early Adopters of Precision Agriculture Technologies
Provedor de dados: 31
Autores: Daberkow,   Stan G.; McBride,   William D.
Corn producers are the largest users of cropland and agrichemicals in U.S. agriculture, and represent a major market for precision agriculture technologies. Based on a USDA survey of 950 corn-producing farms, approximately 9% utilized some aspect of precision agriculture for corn production in 1996. A logit analysis indicated that farmers were more likely to adopt precision technologies if they farmed a large number of corn acres, earned a sizable farm income, and had high expected corn yields. The probability of adoption was also higher for farm operators using a computerized farm record system, who were less than 50 years of age, and who relied on crop consultants for information on precision agriculture.
Tipo: Journal Article
Palavras-chave: Corn farms; Logit analysis; Precision agriculture; Precision farming; Technology adoption; Agribusiness; Research and Development/Tech Change/Emerging Technologies.
Ano: 1998
URL: http://purl.umn.edu/90442

Optimal Information Acquisition under a Geostatistical Model
Provedor de dados: 31
Autores: Pautsch,   Gregory R.; Babcock,   Bruce A.; Breidt,   F. Jay.
Studies examining the value of switching to a variable rate technologies (VRT) fertilizer program assume producers possess perfect soil nitrate information. In reality, producers estimate soil nitrate levels with soil sampling. The value of switching to a VRT program depends on the quality of the estimates and on how the estimates are used. Larger sample sizes, increased spatial correlation, and decreased variability improve the estimates and increase returns. Fertilizing strictly to the estimated field map fails to account for estimation risk. Returns increase if the soil sample information is used in a Bayesian fashion to update the soil nitrate beliefs in non-sampled sites.
Tipo: Conference Paper or Presentation
Palavras-chave: Estimation risk; Geostatistics; Nitrogen fertilizer; Optimal sample sizes; Precision farming; Single rate technology; Variable rate technology; Variogram; Research Methods/ Statistical Methods.
Ano: 1999
URL: http://purl.umn.edu/18358

Net Effect of Education on Technology Adoption by U.S. Farmers
Provedor de dados: 31
Autores: Uematsu,   Hiroki; Mishra,   Ashok K.
The objective of this study is to estimate the net effect of education on technology adoption for U.S. farmers. Using 2006 Agricultural Resource Management Survey data, this study develops a simultaneous equations model to integrate farmers’ labor allocation decision with adoption of both time saving and management intensive technologies.
Tipo: Conference Paper or Presentation
Palavras-chave: Education; Technology adoption; Off-farm labor supply; Precision farming; Genetically modified crops; Simultaneous equations model; Crop Production/Industries; Farm Management; Production Economics; Risk and Uncertainty; Q10; Q12.
Ano: 2010
URL: http://purl.umn.edu/56450

A precíziós gazdálkodás terjedésének vizsgálata
Provedor de dados: 31
Autores: Kalmar,   Sandor.
A precíziós gazdálkodás – 90-es évek közepétől kezdődő – alkalmazását követően napjainkban is megválaszolásra vár a beruházás megtérülési idejének és a területnagyságnak az összefüggése. Megállapítható, hogy a beruházás az eszközök gyors avulását figyelembe véve, 3 éves megtérülés esetén, 3 millió Ft (áfával együtt) értékű eszközberuházás, 21 140 Ft/ha inputfelhasználás és 5%-os megtakarítási szint mellett 946 ha-on térülhet meg az inputanyag-megtakarításból. Természetesen több végeredmény is lehetséges a változók függvényében.  --------------------------------------  Ever since precision farming was introduced in the mid-nineties, correlations between payback period and area size have been unexplored. It was found that – taking into account the quick...
Tipo: Journal Article
Palavras-chave: Precíziós gazdálkodás; Innováció terjedése; Ökonómiai modell; Precision farming; Spreading of innovation; Economic model; Crop Production/Industries; Farm Management; Research and Development/Tech Change/Emerging Technologies.
Ano: 2009
URL: http://purl.umn.edu/92531

Prefarm Systems and economical analysis of practical experiences
Provedor de dados: 31
Autores: Gnip,   Pavel; Kafka,   Stepan; Cepicky,   Jachym; Charvat,   Karel.
The system of Precision farming guarantees a detail monitoring of data and information necessary for a successful decision in a crop production. The system is designed for a data collection from several sources. The data are collected by a service company and also directly by farmers. The paper also analyses the economical efficiency on the base of Medlov Farm. Next development is currently running under projects Prezem and AgriSensor.
Tipo: Journal Article
Palavras-chave: GPS; GIS; Precision farming; Economical analysis; Monitoring; Farm Management; Research and Development/Tech Change/Emerging Technologies.
Ano: 2009
URL: http://purl.umn.edu/96855

VARIABLE RATE NITROGEN APPLICATION ON CORN FIELDS: THE ROLE OF SPATIAL VARIABILITY AND WEATHER
Provedor de dados: 31
Autores: Roberts,   Roland K.; Mahajanashetti,   S.B.; English,   Burton C.; Larson,   James A.; Tyler,   Donald D.
Meta-response functions for corn yields and nitrogen losses were estimated from EPIC-generated data for three soil types and three weather scenarios.  These metamodels were used to evaluate variable rate (VRT) versus uniform rate (URT) nitrogen application technologies for alternative weather scenarios and policy option.  Except under very dry conditions, returns per acre for VRT were higher than for URT and the economic advantage of VRT increased as realized rainfall decreased from expected average rainfall.  Nitrogen losses to the environment from VRT were lower for all situation examined, except on fields with little spatial variability.
Tipo: Journal Article
Palavras-chave: Corn; Environment; Meta-response functions; Nitrogen restriction; Precision farming; Site-specific management; Spatial variability; Weather variability; Crop Production/Industries.
Ano: 2002
URL: http://purl.umn.edu/15512

Precision Farming by Cotton Producers in Six Southern States: Results from the 2001 Southern Precision Farming Survey
Provedor de dados: 31
Autores: Roberts,   Roland K.; English,   Burton C.; Larson,   James A.; Cochran,   Rebecca L.; Goodman,   W. Robert; Larkin,   Sherry L.; Marra,   Michele C.; Martin,   Steven W.; Reeves,   Jeanne M.; Shurley,   W. Donald.
Precision Farming by Cotton Producers in Six Southern States: Results from the 2001 Southern Precision Farming Survey
Tipo: Report
Palavras-chave: Cotton; Precision farming; Survey; Agribusiness; Farm Management; Production Economics; Research and Development/Tech Change/Emerging Technologies.
Ano: 2002
URL: http://purl.umn.edu/91331

ECONOMICS OF VARIABLE RATE PLANTING FOR CORN
Provedor de dados: 31
Autores: Lowenberg-DeBoer,   James.
This analysis works out the economic implications for variable rate seeding of the corn population response curves estimated by Pioneer Hi-Bred agronomists. Examples are developed for various mixes of low, medium and high yield potential soil, as well as for a range of seed costs and variable rate equipment costs. The strategies analyzed were: variable rate planting using agronomic recommendations for each yield potential zone, variable rate planting using an economic decision rule for each yield potential zone, an information strategy which sets the uniform planting rate at the highest population indicated by agronomic recommendations for any part of the field and a second information strategy which uses an economic decision rule for the whole field based...
Tipo: Working or Discussion Paper
Palavras-chave: Precision farming; Variable rate; Corn; GPS; Production economics; Crop Production/Industries.
Ano: 1998
URL: http://purl.umn.edu/28685

INFORMATION AND THE ADOPTION OF PRECISION FARMING TECHNOLOGIES
Provedor de dados: 31
Autores: McBride,   William D.; Daberkow,   Stan G.
Precision farming technologies have been commercially available since the early 1990s, but the pace of adoption among U.S. farmers has been modest. This study examines the relationship between the adoption of diagnostic and application techniques of precision farming and sources of information available to farmers about precision farming. The model used in the analysis accounts for sources of self-selection in the adoption process that could bias the results. Results indicate interpersonal information sources have increased adoption relative to information from the mass media, and the private sector has been the driving force behind the diffusion of precision farming. Information from crop consultants and input suppliers has had the greatest impact on the...
Tipo: Journal Article
Palavras-chave: Information sources; Logit analysis; Precision farming; Self-selection bias; Technology adoption; Farm Management; Research and Development/Tech Change/Emerging Technologies.
Ano: 2003
URL: http://purl.umn.edu/14671

Aprecíziós gazdálkodás beruházásainak megtérülése
Provedor de dados: 31
Autores: Smuk,   Norbert; Milics,   Gabor; Salamon,   Lajos; Nemenyi,   Miklos.
A vizsgálatokból megállapítható, hogy a precíziós gazdálkodás bevezetésére irányuló beruházások megtérülése és az üzemi méretek között szoros az összefüggés. A feltételezett öt- és hatéves megtérülés mellett a hozam- vagy az elvárt kamatszint-változást a nagyobb területű üzemek képesek ellensúlyozni.    --Return on investment in projects for implementing precision farming is closely related to farm size. In the event of the envisaged repayment over five or six years, farms with a larger area can balance changes in yield or interest rate.
Tipo: Journal Article
Palavras-chave: Precíziós gazdálkodás; Beruházás; Megtérülés; Üzemi méret; Precision farming; Investment; Return on investment; Farm size; Crop Production/Industries; Farm Management.
Ano: 2009
URL: http://purl.umn.edu/92483

ECONOMIC AND ENVIRONMENTAL BENEFITS OF VARIABLE RATE APPLICATION OF NITROGEN TO CORN FIELDS: ROLE OF VARIABILITY AND WEATHER
Provedor de dados: 31
Autores: English,   Burton C.; Mahajanashetti,   S.B.; Roberts,   Roland K.
The use of meta-response functions based on EPIC-generated data resulted in comparisons between variable (VRAT) and uniform rate application technologies for 36 simulated fields.  VRAT was more profitable and less nitrogen was lost to the environment in most cases.   When spatial variability was small, uniform rate application techniques were adopted.   However, when nitrogen use is restricted, VRAT is used on all simulated fields.
Tipo: Conference Paper or Presentation
Palavras-chave: Precision farming; Site-specific farming; Spatial variability; Nitrogen restriction; Rainfall; EPIC; Crop growth simulation model; Meta-response functions; Environmental Economics and Policy; Research and Development/Tech Change/Emerging Technologies; Resource /Energy Economics and Policy.
Ano: 1999
URL: http://purl.umn.edu/21533

A Binary Logit Estimation of Factors Affecting Adoption of GPS Guidance Systems by Cotton Producers
Provedor de dados: 31
Autores: Banerjee,   Swagata (Ban); Martin,   Steven W.; Roberts,   Roland K.; Larkin,   Sherry L.; Larson,   James A.; Paxton,   Kenneth W.; English,   Burton C.; Marra,   Michele C.; Reeves,   Jeanne M.
Binary logit analysis was used to identify the factors influencing adoption of Global Positioning System (GPS) guidance systems by cotton farmers in 11 Mid-south and Southeastern states. Results indicate that adoption was more likely by those who had already adopted other precision-farming practices and had used computers for farm management. In addition, younger and more affluent farmers were more likely to adopt. Farmers with larger farms and with relatively high yields were also more likely to adopt. Education was not a significant factor in a farmer’s decision to adopt GPS guidance systems.
Tipo: Journal Article
Palavras-chave: Binary logit; Cotton; GPS guidance system; Marginal effect; Precision farming; Technology adoption; Agribusiness; Crop Production/Industries; Q2; Q16; Q19; Q20; Q24.
Ano: 2008
URL: http://purl.umn.edu/45530

The Variable-Rate Input Application Decision for Multiple Inputs with Interactions
Provedor de dados: 31
Autores: Roberts,   Roland K.; English,   Burton C.; Larson,   James A.
Research has evaluated the relative profitability of variable-rate (VRT) versus uniform-rate (URT) application of a single input in fields with multiple management zones. This study addresses map-based VRT decisions for multiple inputs in fields with multiple management zones. The decision-making framework is illustrated for nitrogen and water applied to irrigated cotton in fields with three management zones. Results suggest traditional methods of determining VRT application of a single input may by suboptimal if interactions exist among VRT inputs and URT inputs. Implications are that a systems approach to multiple-input VRT decisions can produce increased net returns to VRT.
Tipo: Journal Article
Palavras-chave: Breakeven analysis; Cotton; Economic feasibility; Multiple-inputs; Precision farming; Variable-rate technology; Crop Production/Industries.
Ano: 2006
URL: http://purl.umn.edu/8616

SPATIAL BREAK-EVEN VARIABILITY FOR CUSTOM HIRE VARIABLE RATE TECHNOLOGY ADOPTION
Provedor de dados: 31
Autores: Mahajanashetti,   S.B.; English,   Burton C.; Roberts,   Roland K.
A theoretical model identified ranges of spatial variability required within multiple-land-class fields for economically viable variable rate technology (VRT) and the spatial variability required for maximum return to VRT.  An example illustrated that return to VRT and the viable range of spatial variability increased for higher corn and nitrogen prices.
Tipo: Conference Paper or Presentation
Palavras-chave: Precision farming; Site-specific farming; Nitrogen; Corn; Spatial variability; Yield variability; Profit function; Land Economics/Use; Resource /Energy Economics and Policy.
Ano: 1999
URL: http://purl.umn.edu/21676

ASSESSING SPATIAL BREAK-EVEN VARIABILITY IN FIELDS WITH TWO OR MORE MANAGEMENT ZONES
Provedor de dados: 31
Autores: English,   Burton C.; Mahajanashetti,   S.B.; Roberts,   Roland K.
Farmers are interested in knowing whether applying inputs at variable rates across a field is economically viable.  The answer depends on the crop, the input, their prices, the cost of variable rate technology (VRT) versus uninform rate technology (URT), and the spatial and yield response variability within each field.  Methods were investigated for determining the range of spatial variability over which the return to VRT covers its additional cost compared with URT in fields with multiple management zones.  Models developed in this article, or variants thereof, could be used to help farmers make the VRT adoption decision.
Tipo: Journal Article
Palavras-chave: Management zones; Nitrogen; Precision farming; Site-specific management; Spatial break-even variability proportions; Spatial variability; Variable rate technology; Yield response variability; Farm Management.
Ano: 2001
URL: http://purl.umn.edu/15450

Jövedelemtérképek a precíziós növénytermelésben
Provedor de dados: 31
Autores: Smuk,   Norbert; Milics,   Gabor; Nemenyi,   Miklos.
A mezőgazdaságban egy-egy tevékenységnél magas tőkeigényű beruházások szükségesek a termeléshez. Ezek fényében érthető, hogy a gazdálkodó a piac változékonyságát csak lassan képes követni, ezért több időbe telik a piaci hatásokra történő reagálás. Napjaink vezetőinek ma már nem elég kifogástalanul ismerni a növénytermelés rejtelmeit, megfelelő ökonómiai látásmód is szükséges. Ehhez nyújthat segítséget a szemléletes jövedelemtérkép, amely a gazdálkodónak egyértelmű információkkal szolgál a jövedelmezőségről, és amit hazánkban eddigi ismereteink szerint még nem készítettek. Jelen publikációnk a jövedelemtérképezés gyakorlati alkalmazhatóságát hivatott bemutatni. A jövedelemtérképek hasznosítható többletinformációkat nyújtanak a hozamtérképekhez képest....
Tipo: Journal Article
Palavras-chave: Tápanyag-visszapótlás; Hozam-; Jövedelemtérkép; Precíziós növénytermelés; Nutrient supplementation; Yield and revenue maps; Precision farming; Crop Production/Industries; Production Economics; Research and Development/Tech Change/Emerging Technologies.
Ano: 2010
URL: http://purl.umn.edu/99084

Adoption of Site-Specific Information and Variable-Rate Technologies in Cotton Precision Farming
Provedor de dados: 31
Autores: Roberts,   Roland K.; English,   Burton C.; Larson,   James A.; Cochran,   Rebecca L.; Goodman,   W. Robert; Larkin,   Sherry L.; Marra,   Michele C.; Martin,   Steven W.; Shurley,   W. Donald; Reeves,   Jeanne M.
Probit analysis identified factors that influence the adoption of precision farming technologies by Southeastern cotton farmers. Younger, more educated farmer who operated larger farms and were optimistic about the future of precision farming were most likely to adopt site-specific information technology. The probability of adopting variable-rate input application technology was higher for younger farmers who operated larger farms, owned more of the land they farmed, were more informed about the costs and benefits of precision farming, and were optimistic about the future of precision farming. Computer use was not important, possibly because custom hiring shifts the burden of computer use to agribusiness firms.
Tipo: Journal Article
Palavras-chave: Cotton; Grid soil sampling; Precision farming; Probit; Sample selection; Site-specific information; Technology adoption; Variable-rate application; D21; Q12; Q16.
Ano: 2004
URL: http://purl.umn.edu/42943

Precision Farming by Cotton Producers in Twelve Southern States: Results from the 2009 Southern Cotton Precision Farming Survey
Provedor de dados: 31
Autores: Mooney,   Daniel F.; Roberts,   Roland K.; English,   Burton C.; Lambert,   Dayton M.; Larson,   James A.; Velandia,   Margarita M.; Larkin,   Sherry L.; Marra,   Michele C.; Martin,   Steven W.; Mishra,   Ashok K.; Paxton,   Kenneth W.; Rejesus,   Roderick M.; Segarra,   Eduardo; Wang,   Chenggang; Reeves,   Jeanne M.
Precision Farming by Cotton Producers in Twelve Southern States: Results from the 2009 Southern Cotton Precision Farming Survey
Tipo: Report
Palavras-chave: Cotton; Precision farming; Survey; Agribusiness; Farm Management; Production Economics; Research and Development/Tech Change/Emerging Technologies.
Ano: 2010
URL: http://purl.umn.edu/91333

A precíziós növénytermelés externális hatásai az Agárdi Farm Kft. esetében
Provedor de dados: 31
Autores: Sinka,   Anett.
A hagyományos mezőgazdasági termelés negatív hatásainak kiküszöbölése ér¬dekében az Európai Unió országaiban az utóbbi évtizedben egyre fontosabbá vált a multifunkcionális mezőgazdaság. Ahhoz, hogy a vidékfejlesztés, a környezetgazdálkodás az agrárgazdaság integrált részévé váljék, a gazdasági gyakorlatnak szá¬mos területen szükséges változtatni: merőben új módszerek alkalmazása, a koráb¬ban használt vagy meglévő technológiák megújítása, mások által már kipróbált eljá¬rások adaptálása, mind-mind egy-egy lehetőséget kínál a jól működő, többfunkciós mezőgazdasághoz. Mindezen okok mérlegelése után döntött úgy az Agárdi Farm Kft., hogy átáll a ha¬gyományos gazdálkodásról a precíziós növénytermelésre. A precíziós növényterme¬lési technológia nem más, mint a...
Tipo: Journal Article
Palavras-chave: Externáliák; Multifunkcionális mezőgazdaság; Precíziós növénytermelés; Versenyképesség; Externalities; Multifunctional agriculture; Precision farming; Competitiveness; Crop Production/Industries; Farm Management.
Ano: 2009
URL: http://purl.umn.edu/92499

PRECISION FARMING IN IRRIGATED CORN PRODUCTION: AN ECONOMIC PERSPECTIVE
Provedor de dados: 31
Autores: Watson,   Susan; Segarra,   Eduardo; Machado,   Stephen; Bynum,   Edsel; Archer,   Thomas; Bronson,   Kevin.
A dynamic optimization model is used to assess the profitability of precision and whole-field farming in corn production.  Yield, on the average, was higher under whole-field farming practices, while net present value of returns was higher under precision farming, on the average, by 7.41% and 8.15%, respectively.
Tipo: Conference Paper or Presentation
Palavras-chave: Precision farming; Mathematical optimization; Technology adoption; Crop Production/Industries.
Ano: 2003
URL: http://purl.umn.edu/35053

Precision Farming by Cotton Producers in Eleven Southern States: Results from the 2005 Southern Precision Farming Survey
Provedor de dados: 31
Autores: Cochran,   Rebecca L.; Roberts,   Roland K.; English,   Burton C.; Larson,   James A.; Goodman,   W. Robert; Larkin,   Sherry L.; Marra,   Michele C.; Martin,   Steven W.; Paxton,   Kenneth W.; Shurley,   W. Donald; Reeves,   Jeanne M.
Precision Farming by Cotton Producers in Eleven Southern States: Results from the 2005 Southern Precision Farming Survey
Tipo: Report
Palavras-chave: Cotton; Precision farming; Survey; Agribusiness; Farm Management; Production Economics; Research and Development/Tech Change/Emerging Technologies.
Ano: 2006
URL: http://purl.umn.edu/91332

Economic Analysis of Phosphorus Applications under Variable and Single-Rate Applications in the Bothaville District
Provedor de dados: 31
Autores: Maine,   Ntsikane; Nell,   Wilhelm T.; Lowenberg-DeBoer,   James; Alemu,   Zerihun Gudeta.
Variable-rate (VR) application of inputs in South African cash crop production is mainly concerned with fertilizer and lime, and this indicates the importance of these inputs in cash crop production. However, the profitability of VR application of inputs has not yet been investigated under South African conditions. This paper studies the maize yield response to variable-rate application of phosphorus (P) and the profitability thereof in South Africa, on the basis of data collected on a 104-hectare experimental field on a farm in the Bothaville district. The strip-plot design of 180 strips was used for this on-farm research experiment. This design involved treatments that run in the same direction across the field as planting and harvesting. The objective...
Tipo: Journal Article
Palavras-chave: Precision agriculture; Precision farming; Site-specific phosphorus management; Variable-rate application; Fertilizer; Yield response; South Africa; Crop Production/Industries.
Ano: 2007
URL: http://purl.umn.edu/7047

IMPROVING NITROGEN MANAGEMENT USING SITE-SPECIFIC TECHNOLOGY IN THE VIRGINIA COASTAL PLAIN
Provedor de dados: 31
Autores: Peng,   Wei; Bosch,   Darrell J.
On a Virginia crop farm, alternative levels of information are evaluated for managing nitrogen applications based on soil properties and yield potential. Application of variable rates of nitrogen based on crop yield potential can increase profitability and reduce nitrogen pollution potential.
Tipo: Conference Paper or Presentation
Palavras-chave: Precision farming; Pollution; Cost; Information; Soil maps; Environmental Economics and Policy; Resource /Energy Economics and Policy.
Ano: 2000
URL: http://purl.umn.edu/21746

RISK MANAGEMENT POTENTIAL OF PRECISION FARMING TECHNOLOGIES
Provedor de dados: 31
Autores: Lowenberg-DeBoer,   James.
Initial ideas on risk management uses of precision agricultural technology focused on site-specific treatment of problem areas to reduce the probability of low yields and returns. Recent discussions deal with sensor and remote-sensing information to improve marketing and "as applied maps" as trace-back mechanisms to manage liability. A theoretical model is presented that suggests that there are plausible circumstances under which precision farming can reduce temporal yield variability. Empirical evidence from an on-farm trial of site-specific P&amp;K management in the Eastern Cornbelt supports the hypothesis that precision farming can have risk-reducing benefits.
Tipo: Journal Article
Palavras-chave: Food safety; GIS; GPS; Crop insurance; Marketing; Precision farming; Site specific management; Risk; Research and Development/Tech Change/Emerging Technologies; Risk and Uncertainty.
Ano: 1999
URL: http://purl.umn.edu/15366

Optical crop sensor for variable-rate nitrogen fertilization in corn: II - indices of fertilizer efficiency and corn yield
Provedor de dados: 90
Autores: Bragagnolo,Jardes; Amado,Telmo Jorge Carneiro; Nicoloso,Rodrigo da Silveira; Santi,Antônio Luis; Fiorin,Jackson Ernani; Tabaldi,Fabiano.
Generally, in tropical and subtropical agroecosystems, the efficiency of nitrogen (N) fertilization is low, inducing a temporal variability of crop yield, economic losses, and environmental impacts. Variable-rate N fertilization (VRF), based on optical spectrometry crop sensors, could increase the N use efficiency (NUE). The objective of this study was to evaluate the corn grain yield and N fertilization efficiency under VRF determined by an optical sensor in comparison to the traditional single-application N fertilization (TSF). With this purpose, three experiments with no-tillage corn were carried out in the 2008/09 and 2010/11 growing seasons on a Hapludox in South Brazil, in a completely randomized design, at three different sites that were analyzed...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Nitrogen; N-Sensor; Optical spectrometry; Precision farming.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832013000500019

Determination of nitrogen and chlorophyll levels in bean-plant leaves by using spectral vegetation bands and indices
Provedor de dados: 124
Autores: Abrahão,Selma Alves; Pinto,Francisco de Assis de Carvalho; Queiroz,Daniel Marçal de; Santos,Nerilson Terra; Carneiro,José Eustáquio de Souza.
This study aimed to develop classifiers based on different combinations of spectral bands and vegetation indices from original, segmented and reflectance images in order to determine the levels of leaf nitrogen and chlorophyll in the bean, and to define the best time and best variables. A remote-sensing system was used, consisting of a helium balloon and two small-format digital cameras. Besides the individual spectral bands, four vegetation indices were tested: simple ratio, normalized difference, normalized difference in the green band, and modified-chlorophyll absorption. The classifiers proved to be efficient in determining levels of leaf nitrogen and chlorophyll. The best time for determining leaf N content was at 13 DAE (stage V4). The best...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Precision farming; Remote sensing; Nitrogen dosage.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902013000300007

Spatial distribution of the chemical properties of the soil and of soybean yield in the field
Provedor de dados: 124
Autores: Gazolla-Neto,Alexandre; Fernandes,Marciabela Correa; Vergara,Rafael de Oliveira; Gadotti,Gizele Ingrid; Villela,Francisco Amaral.
ABSTRACT The aim of this study was to evaluate the spatial dependence between chemical properties of the soil and yield components in the soybean using precision farming techniques. Samples of the soil and plants were taken from georeferenced points to determine the chemical properties of the soil and the yield components. The results were submitted to Pearson correlation analysis, descriptive statistics and geostatistics. The coefficient of variation showed a wide range of distribution for the chemical attributes of the soil, with the highest indices being found for the levels of available phosphorus (102%) and potassium (72.65%). Soil pH and organic matter showed a coefficient of variation of 5.96 and 15.93% respectively. Semivariogram analysis of the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Precision farming; Soil fertility; Spatial distribution; Seed yield.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902016000200325

Biometric characteristics and canopy reflectance association for early-stage sugarcane biomass prediction
Provedor de dados: 63
Autores: Rocha,Murillo Grespan da; Barros,Flávio Margarito Martins de; Oliveira,Stanley Robson de Medeiros; Amaral,Lucas Rios do.
ABSTRACT: Knowing the spatial variability of sugarcane biomass in the early stages of development may help growers in their management decision-making. Proximal canopy sensing is a promising technology that can identify this variability but is limited to quantifying plant-specific parameters. In this study, we evaluated whether biometric variables integrated with canopy reflectance data can assist in the generation of models for early-stage sugarcane biomass prediction. To substantiate this assertion, four sugarcane-producing fields were measured with an active crop canopy sensor and 30 sampling plots were selected for manually quantifying chlorophyll content, plant height, stalk number and aboveground biomass. We determined that Random Forest and Multiple...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Random forest; Canopy sensor; Vegetation indices; Precision farming; Data mining.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162019001400274

Development of a smart machine-vision-based system to detect water stress in greenhouse tomato plants
Provedor de dados: 111
Autores: LAK, MohammadBagher.
Timely detection of water stress in agricultural crops is important. In this paper, a smart classification algorithm was developed to detect water stress in tomato plants that were grown in the greenhouse. During the growth period, thermal and visible light images were acquired from the canopy tops in two states: (1) plants in normal conditions; and (2) plants under water stress. Images were obtained using a camera that recorded simultaneous frames of thermal and visible (red, green, and blue (RGB)) features. Based on these features, 22 parameters were defined and applied to classify the image frames. In order to develop an efficient algorithm, principal component analysis (PCA) was applied to optimize the classifying of parameters. For normalizing the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Image classification; MLPNN; Normalization; PCA; Precision farming.
Ano: 2021
URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/6343

Design and evaluation of a yield monitoring system for combinable crops
Provedor de dados: 111
Autores: Kargarpour, Hoda; Razavi, Jalil; Hemmat, Abbas; Salar, Mahmood Reza.
The existence of spatial variability within fields can be beneficial if inputs for arable crop are given to the field according to locally determined requirements. While yield mapping has become an important part of precision farming strategies, the goal of this paper is to plot a yield map by the application of yield monitoring components. A yield monitoring system capable of providing sufficient reliable data to plot a yield map for small grain fields in central regions of Iran was developed. The system consisted of an impact flow sensor determining the mass flow of grain, the GPS receiver determining geographical position of the machine, two shaft encoders measuring the speed of the combine, an ultrasonic sensor measuring the actual cutting width, and a...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Wheat; Spatial variability; Yield map; Mass flow sensor; Precision farming.
Ano: 2016
URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/3608