|
|
|
| Registros recuperados: 144 | |
|
|
| Álvarez-Sánchez,Geiner F; Arias-de la Cruz,Heidi L; Salgado-García,Sergio; Córdova-Sánchez,Samuel; Ortiz-Laurel,Hipólito; Castelán-Estrada,Mepivoseth; García-de la Cruz,Rubén; Castañeda-Ceja,Raúl. |
| Abstract Precision mechanized sowing of sugarcane has been delayed due to germination failures caused in sowing process by pieces of sugarcane, generating economic losses by reducing production. The aim of this study was to evaluate different polymers and cultivars of sugarcane to elaborate artificial seed CP-54, seed germination and quality of sugarcane plants. An experiment was carried out in two stages in experimental field of the Colegio de Postgraduados Campus Tabasco, Mexico. Results indicate that the best physical stage of artificial seed CP-54 was obtained in Mex 69-290, Mex 68-P-23 and CP 72-2086 cultivars encapsulated with starch polymers and sodium alginate. Artificial seed CP-54 germination was 100 and 84% encapsulated with starch and alginate... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Encapsulation; Precision agriculture; Saccharum spp.; Seed germination; Buds; Sugarcane response. |
| Ano: 2018 |
URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0120-28122018000100094 |
| |
|
|
| Souza, Cristiano Márcio Alves de; Universidade Federal da Grande Dourados; Bottega, Eduardo Leonel; Universidade Federal de Viçosa; Vilela, Fábio Velloso; Universidade Federal da Grande Dourados; Rafull, Leidy Zulys Leyva; Universidade Federal da Grande Dourados; Queiroz, Daniel Marçal de; Universidade Federal de Viçosa. |
| O objetivo deste trabalho foi analisar o efeito da distribuição espacial do teor de água dos grãos e da produtividade do feijoeiro sobre as perdas e a qualidade do produto durante o processo de arranquio, recolhimento, trilha e separação em uma recolhedora-trilhadora. O trabalho foi realizado em uma área de 35 ha sob pivô central. Foi determinado o teor de água dos grãos no arranquio e no recolhimento, a produtividade total e líquida da lavoura, a velocidade de trabalho da máquina, a quantidade de grãos perdidos no arranquio, no recolhimento e na trilha e separação e a porcentagem de matéria estranha e própria do feijoeiro presente no produto. As perdas de grãos e a qualidade do produto colhido apresentaram elevada variação de seus valores na área,... |
|
Palavras-chave: 5.01.03.02-4 grãos; Impurezas; Agricultura de precisão Mecanização Agrícola grain; Impurity; Precision agriculture. |
| Ano: 2010 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/3240 |
| |
|
|
| Pias, Osmar Henrique de Castro; Cherubin, Maurício Roberto; Basso, Claudir José; Santi, Antônio Luis; Molin, José Paulo; Bayer, Cimélio. |
| There is no consensus in the literature regarding how many subsamples are needed to perform accurate on-farm soil penetration resistance (SPR) mapping. Therefore, the objective of this study was to define the number of subsamples per sampling point needed to quantify the SPR. The experiment was performed in a 4.7 ha area and employed a 50 × 50 m grid system (18 sampling points). The SPR was evaluated using a digital penetrometer in two different years with 1, 2, 3, 4, 5, 6, 9, 12, and 15 subsamples per sampling point. The SPR maps produced with increasing numbers of subsamples were compared to the reference maps (15 subsamples) using the relative deviation coefficient and Pearson´s linear correlation. A reduction in the number of subsamples promoted an... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Soil compaction; Sampling protocol; Precision agriculture; Microvariability. soil compaction; Sampling protocol; Precision agriculture; Microvariability Física do solo. |
| Ano: 2018 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/34989 |
| |
|
| |
|
| |
|
|
| Pias, Osmar Henrique de Castro; Cherubin, Maurício Roberto; Basso, Claudir José; Santi, Antônio Luis; Molin, José Paulo; Bayer, Cimélio. |
| There is no consensus in the literature regarding how many subsamples are needed to perform accurate on-farm soil penetration resistance (SPR) mapping. Therefore, the objective of this study was to define the number of subsamples per sampling point needed to quantify the SPR. The experiment was performed in a 4.7 ha area and employed a 50 × 50 m grid system (18 sampling points). The SPR was evaluated using a digital penetrometer in two different years with 1, 2, 3, 4, 5, 6, 9, 12, and 15 subsamples per sampling point. The SPR maps produced with increasing numbers of subsamples were compared to the reference maps (15 subsamples) using the relative deviation coefficient and Pearson´s linear correlation. A reduction in the number of subsamples promoted an... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Soil compaction; Sampling protocol; Precision agriculture; Microvariability.; Soil compaction; Sampling protocol; Precision agriculture; Microvariability; Física do solo. |
| Ano: 2018 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/34989 |
| |
|
|
| Martins, Mariana Ventura; UNESP; Carvalho, Morel de Passos e; UNESP; Andreotti, Marcelo; UNESP; Montanari, Rafael; UNESP. |
| Os atributos físicos do solo têm se mostrado de grade interesse para a agricultura contemporânea, uma vez que refletem decisivamente sobre a produtividade vegetal. Em 2006, no campus da Faculdade de Engenharia de Ilha Solteira, Unesp, analisou-se a produtividade do feijoeiro (PG) no sistema plantio direto irrigado, a resistência mecânica do solo à penetração (RP), a densidade do solo (DS) e as umidades gravimétrica (UG) e volumétrica (UV) em profundidade, num LATOSSOLO VERMELHO Distroférrico. O objetivo foi determinar as correlações lineares e espaciais, entre os atributos estudados, visando selecionar um indicador da qualidade física do solo de boa representatividade para a PG. Foi instalada a malha, para a coleta de dados contendo 135 pontos amostrais,... |
|
Palavras-chave: 5.02.01.07-7 Solos Florestais manejo do solo; Qualidade física do solo; Plantio direto; Agricultura de precisão; Phaseolus vulgaris. soil management; Soil physical quality; No-tillage; Precision agriculture; Phaseolus vulgaris. |
| Ano: 2009 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/6641 |
| |
|
|
| Pavlu, Franz Arthur; Molin, José Paulo. |
| Sphenophorus levis has become a major pest of sugarcane plantations in Brazil, causing significant losses in productivity. Few studies have been conducted on the spatial distribution of this pest in the field, which is essential for the development of sampling plans. We aimed to characterize the spatial distribution of S. levis in sugarcane, defining a reliable, practical and feasible sampling plan, as well as generating application maps for production areas, allowing for comparison of the consumption of inputs in a conventional system with site-specific application. The study was conducted in areas around Piracicaba, Brazil. First, we conducted sampling to evaluate the best sampling density to characterize the spatial dependence. The results showed that... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: 5.03.01.00-4 eostatistics; Site-specific application; Precision agriculture; Entomology; Soil pests; Sugarcane weevil Máquinas e Implementos Agrícolas. |
| Ano: 2016 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/28599 |
| |
|
| |
|
|
| Bagheri, Nikrooz -. |
| To evaluate the performance of a variable rate boom sprayer, an artificial neural network (ANN) was employed. To model output flow of nozzles, 727 nets by four neural net models, namely, linear, MLP, RBF and GRNN were tested. For each nozzle, 45, 22 and 23 experimental data were used for train, verification and test, respectively. The results indicated that RBF model was selected as the best by regression ratio of 0.198 and R2 of 0.98. To investigate the capability of RBF model in prediction of nozzles flow, statistical analysis was used. Based on the results, average value of R2 for statistical and RBF models were 0.98 and 0.99, respectively. So, the average value of CV for RBF and statistical models were 18.96% and 19.05%, respectively. From the results,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Precision agriculture; Mechanics of agricultural engineering ANN; Control system; Precision agriculture; Sprayer; VRA.. |
| Ano: 2014 |
URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/2861 |
| |
|
|
| Oksanen, Timo; Hakojärvi, M.; Maksimow, T.; Aspiala, A.; Hautala, M.; Visala, A.; Ahokas, J.. |
| Agricultural machines capable of utilizing variable rate application technology are tackling spatial variability in agricultural fields. Agricultural field robots are the next step in technology, robots which are capable of utilizing sensor and actuating technologies without human contact and operate only areas of interest. However, agricultural field robots are still under research. Robots are just one part of the next generation of crop farming having more advanced tools to do the work which currently requires humans. The next generation of crop farming, in the vision of the authors, is based on automation, which incorporates stationary and moving sensors systems, robots, model based decision making, automated operation planning which adapts to... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Robots; Crop growth models; Soil water models; Precision agriculture; Environment simulation; Decision making; Operation planning. |
| Ano: 2014 |
URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/2604 |
| |
|
| |
|
|
| Elsayed,Salah; Darwish,Waleed. |
| ABSTRACT Spectral remote sensing offers the potential to provide more information for making better-informed management decisions at the crop canopy level in real time. In contrast, the traditional methods for irrigation management are generally time-consuming, and numerous observations are required to characterize them. The aim of this study was to investigate the suitability of hyperspectral reflectance measurements of remote sensing technique for salinity and water stress condition. For this, the spectral indices of 5 maize cultivars were tested to assess canopy water content (CWC), canopy water mass (CWM), biomass fresh weight (BFW), biomass dry weight (BDW), cob yield (CY), and grain yield (GY) under full irrigation, full irrigation with salinity... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Irrigation; Precision agriculture; Precision phenotyping; Spectral indices. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052017000100062 |
| |
|
|
| Elsayed,Salah; Elhoweity,Mohamed; El-Hendawy,Salah; Schmidhalter,Urs. |
| ABSTRACT High-throughput phenotyping using spectral reflectance measurements offers the potential to provide more information for making better-informed management decisions at the crop canopy level in real time. The aim of this study was to investigate the suitability of hyperspectral reflectance measurements of the crop canopy for the assessment of biomass, nitrogen concentration, nitrogen uptake, relative chlorophyll contents, and yield in 2 peanut cultivars, Giza 5 and Giza 6. Peanuts were grown under field conditions and subjected to 3 doses of nitrogen fertilizer with or without the application of 2 bio-fertilizers, Bradyrhizobium spp. or plant growth-promoting rhizobacteria. Simple linear regression of normalized difference spectral indices and... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Biofertilizer; Phenomics; Phenotyping; Precision agriculture; Spectral reflectance. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052017000200189 |
| |
|
|
| Loureiro,Diego Campana; De-Polli,Helvécio; Ceddia,Marcos Bacis; Aquino,Adriana Maria de. |
| The objective of this work was to study the spatial variability of soil microbial biomass (SMB) and labile soil organic matter pools (labile SOM), under different management systems and plant cover. The experiment was conducted in a Haplic Planosol soil on an Integrated Agroecological Production System (SIPA), in Seropédica, Rio de Janeiro. The evaluated management systems were: alley cropping, pasture, and bush garden, the late one was used as reference area. Three grids of regular spacing of 2.5 x 2.5 meters were used for sampling, consisting of 25 georeferenced points each, where soil samples were taken at 0-10 cm depth. The following labile constituents of soil organic matter were determined: free light fraction (FLF), water soluble C and N, C and N of... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Organic carbon; Geoestatistic; Glomalin; Precision agriculture. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052010000500010 |
| |
|
|
| Pias,Osmar Henrique de Castro; Cherubin,Maurício Roberto; Berghetti,Juliano; Kuss,Cassiano Carlos; Santi,Antônio Luis; Basso,Claudir José. |
| ABSTRACT Euschistus heros is one the most important pest insect in soybean fields in Brazil. Therefore, site-specific management applied for controlling E. heros can result in economic and environmental benefits. However, sampling protocols for assessing spatialtemporal variability of this soybean pest and, then, for guiding a more sustainable pest management, were still unknown. Thus, the objective of this study was to compare the efficiency of sampling grid sizes for monitoring the spatial variability of E. heros infestation along the soybean reproductive stages. Nine sampling campaigns were carried out using the beating sheet method, from R2 to R7 soybean phenological stages. It was used a sampling grid of 10 × 10 m, totaling 338 points in an soybean... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Neotropical brown stink bug; Pest sampling protocol; Spatio-temporal variability; Precision agriculture. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052017000300386 |
| |
|
|
| Claret M,Marcelino; Urrutia P,Roberto; Ortega B,Rodrigo; Best S,Stanley; Valderrama V,Natalia. |
| Consumption of water contaminated with nitrates is associated with important health effects such as methemoglobinemia and gastric cancer. Intensive agriculture, which uses large quantities of N fertilizer, is the main source of nitrates in water systems. There are several strategies to reduce leaching and increase Nitrogen Use Efficiency (NUE). An experiment was conducted with spring wheat (Triticum aestivum L.) under sprinkler irrigation (center pivot) to determine if adjusted N applications using precision agriculture tools and plant demand resulted in a lower groundwater nitrate load. Evaluated treatments were: produced fertilization (Pr), precision agriculture (Pa), chlorophyll meter (Sm), and control without N (W/N). The ceramic capsule methodology... |
| Tipo: Journal article |
Palavras-chave: Nitrates; Precision agriculture; Chlorophyll meter; Wheat. |
| Ano: 2011 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392011000100018 |
| |
|
|
| Camacho-Tamayo,Jesús H; Luengas,Carlos A; Leiva,Fabio R. |
| Growing demand for food exerts pressure on natural resources and may lead to the expansion of agricultural frontiers in developing countries. Most of this pressure appears in tropical zones, in native savannahs, with naturally infertile soils prone to degradation. Crop management in these regions is based on generalized estimates, leaving aside the inherent soil variability, leading to low production efficiency and high risk of environmental damage. This study aims at determining the spatial variability of some chemical properties, including organic carbon, pH, exchangeable acidity, exchangeable aluminum, P, Ca, Mg, K and Na for two Oxisols with different levels of agricultural intervention, in Puerto Lopez, Colombia, in order to identify guidelines for... |
| Tipo: Journal article |
Palavras-chave: Geostatistics; Kriging; Soil management; Precision agriculture; Kriging. |
| Ano: 2008 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392008000100005 |
| |
|
|
| Bazzi,Claudio L; Souza,Eduardo G; Khosla,Raj; Uribe-Opazo,Miguel A; Schenatto,Kelyn. |
| During the last few years, yield maps have become economically feasible for farmers due to technological advances in precision agriculture. However, evidence of yield profitability is still uncertain, and variability in yield has seldom been correlated to variability in profits. Differently from yield maps, profit maps can supply additional information about the economic return for each particular area of a field. The objective of the present work was to study how management decisions can be facilitated by transforming yield-map datasets into profit maps and the importance of the selection of interpolator type. Yield and profit maps were generated for each data set (three soybean fields and one corn field) using the inverse of the distance (ID), the... |
| Tipo: Journal article |
Palavras-chave: Precision agriculture; Profit map; Profitability map. |
| Ano: 2015 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202015000300007 |
| |
|
| |
| Registros recuperados: 144 | |
|
|
|
