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Registros recuperados: 52
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A Practical Algorithm for Multiple-Phase Control Systems in Agricultural and Natural Resource Economics AgEcon
Doole, Graeme J..
Many important problems in agricultural and natural resource economics concern an intertemporal choice between alternate dynamic systems. This significance has motivated a theoretical literature generalizing the necessary conditions of Optimal Control Theory to multiple-phase problems. However, gaining detailed insight into their practical management is difficult because general numerical solution methods are not available. This paper resolves this deficiency through the development of a flexible and efficient computational algorithm based on a set of necessary conditions derived for finite-time, multiple-phase systems. Its effectiveness is demonstrated in an application to a nontrivial crop rotation problem.
Tipo: Journal Article Palavras-chave: Crop management; Multiple-phase systems; Optimal control; Crop Production/Industries; Resource /Energy Economics and Policy.
Ano: 2009 URL: http://purl.umn.edu/50082
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Adoption of Improved Wheat Technologies by Small-Scale Farmers in Mbeya District, Southern Highlands, Tanzania AgEcon
Mussei, Ahaz; Mwanga, Judicate; Mwangi, Wilfred; Verkuijl, Hugo; Mongi, Rose; Elanga, Anthony.
This study was conducted to gain an understanding of how small-scale farmers in Mbeya District have adopted improved wheat technologies promoted by the wheat research program at MARTI-Uyole. The specific objectives were to assess farmers’ wheat management practices, determine the technical and socioeconomic factors affecting the adoption of improved wheat technologies, and draw implications for research, extension, and policy. A purposive multistage sampling procedure was used to select 202 farmers, 160 from Tembela Division and 42 from Isangati Division, which are two important wheat-growing areas in Mbeya District. Primary data were collected using structured questionnaires and supplemented by secondary information obtained from MARTI-Uyole. Juhudi was...
Tipo: Report Palavras-chave: Tanzania; Wheats; Varieties; Innovation adoption; Technology transfer; Economic indicators; Socioeconomic environment; Plant breeding methods; Research programs; Crop management; Fertilizer application; Food production; Small farms; Highlands; Crop Production/Industries; E14; E30.
Ano: 2001 URL: http://purl.umn.edu/56190
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Agronomic management and comparative performance of short duration post-rainy season pigeonpea in rice-based cropping patterns International Rice Research Institute
Ahmed, Nizam Uddin.
143,[2] p. : ill. Thesis (Ph.D.) -- University of Florida
Tipo: Thesis Palavras-chave: Rice; Pigeon peas; Crop rotation; Crop management; Cropping systems.
Ano: 1987 URL: http://hdl.handle.net/123456789/1356
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Artificial Hybridization in Groundnut Open Agri
S.N..
Palavras-chave: Hybridization; Self pollination; Artificial hybridization; Groundnuts; Hybrids; Cross pollination; Planting; Crop management; Genes; Crossing over.
Ano: 1990 URL: http://agropedia.iitk.ac.in/openaccess/?q=node/4085
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Calendário agrícola da cultura do guaraná para o Estado do Amazonas. Infoteca-e
CRAVO, M. da S.; ATROCH, A. L.; MACEDO, J. L. V. de; RIBEIRO, J. de R. C.; LIMA, L. dos P..
Característica. Mudas de semente. Mudas clonadas. Tempo para formação da muda. Doença (Antracnose). Plantio. Produtividade de semente torrada. Início de produção. Estabilidade da produção. Sobrevivência das mudas após plantio. Escolha da área para plantio. Broca, derruba e aceiramento. Queima e encoivaramento. Demarcação da área. Abertura, adubação e fechamento de covas. Plantio. Adubação de cobertura. Roçagem e coroamento. Roçagem, coroamento e adubação de cobertura. Poda. Controle de Tripes. Colheita e beneficiamento. Encomenda de mudas para plantio no ano seguinte.
Tipo: Séries anteriores (INFOTECA-E) Palavras-chave: Processamernto; Brasil; Amazonas; Manaus; Planting stock; Productivity; Cultural methods; Harvest; Postharvest; Processing.; Adubação; Colheita; Controle Biológico; Guaraná; Manejo; Muda; Paullinia Cupana; Produtividade; Pós-Colheita; Pratica Cultural; Plantio; Poda; Semente.; Rendimento; Crop management; Fertilizers; Biological control; Pruning; Seeds; Yields..
Ano: 2001 URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/668643
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Contribution of on-farm assessment of improved varieties and crop management to yield of deepwater rice International Rice Research Institute
Ghosh, A.; Singh, B. N..
p.38-39
Palavras-chave: Crop management; Crop yield; Deepwater rice; Improved varieties; On-farm production; Production economics.
Ano: 2005 URL: http://hdl.handle.net/123456789/1174
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Controle químico da Sigatoka negra da bananeira. I - Trifloxistrobin, Propiconazole e Difenoconazole. Infoteca-e
GASPAROTTO, L.; PEREIRA, J. C. R.; PEREIRA, M. C. N.; COSTA, M. M. da.
A Sigatoka negra, causada pelo fungo Mycosphaerella fijiensis (fase anamórfica: Paracercospora fijiensis (Morelet) Deighton, é a doença mais grave da bananeira, causando perdas de 100% da produção, quando não se efetua o controle. Os fungicidas trifloxistrobin, difenoconazole e propiconazole, foram eficientes no controle da Sigatoka negra, aplicados a intervalos regulares de 14 dias.
Tipo: Comunicado Técnico (INFOTECA-E) Palavras-chave: Mal de sigatoka; Brasil; Amazonas; Manaus; Plant diseases; Chemical controls.; Banana; Cercosporiose; Controle Químico; Doença de Planta; Fungo; Fungicida; Manejo; Musa Acuminata.; Crop management; Fungi; Fungicides..
Ano: 2000 URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/668638
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Crop diversification and cropping systems flexibility in two Philippine rice-based irrigation systems International Rice Research Institute
Moya, Tolentino Bermudez.
343 l.: ill. Thesis (Ph.D.) -- Cornell University
Tipo: Thesis Palavras-chave: Rice; Crop management; Cropping systems; Irrigation systems; Philippines.
Ano: 1992 URL: http://hdl.handle.net/123456789/844
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Crop management of upland rice in different environments International Rice Research Institute
Malabuyoc, Jose Almendrala.
221 p.: ill. Thesis (Ph.D.) -- Gregorio Araneta University Foundation
Tipo: Thesis Palavras-chave: Rice; Crop management; Ecology; Highlands; Upland rice.
Ano: 1993 URL: http://hdl.handle.net/123456789/732
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Crop management studies for sorghum at Khon Kaen University Thai Agricultural
Nimitr Vorasoot; Kitti Wongpichet; Kanae Boontop; Vipa Aemmetavee.
2 ill., 8 tables
Palavras-chave: Sorghum; Peanuts; Soybeans; Crop management; Spacing; Intercropping; Planting patterns; Relay intercropping; Planting date; Yields; Khon Kaen University; ข้าวฟ่าง; ระยะปลูก; แบบแผนการปลูก; ระบบการปลูกพืชแบบสลับ; ระบบการปลูกพืชเหลื่อมฤดู; ระยะยาว; การจัดการระบบการปลูกพืช.
Ano: 1977 URL: http://anchan.lib.ku.ac.th/agnet/handle/001/3923
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Cultivo de milho em várzea do Amazonas: variedades BR-5102 e saracura. Infoteca-e
BARRETO, J. F.; DIAS, M. C.; XAVIER, J. J. B. N.; MARTINS, G. C.; FIGUEIREDO, E. A..
Visando disponibilizar variedades melhoradas e adaptadas as condicoes ambientais do Amazonas, a Embrapa Amazonia Ocidental em conjunto com a Embrapa Milho e Sorgo, apos varias etapas de selecao, com enfase maior para as varzeas, em solos classificados como gley pouco humido e caracterizados como de alta fertilidade natural e, tambem de maior concentracao de produtores da cultura. Estas variedades selecionadas e adaptadas as condicoes de varzea, se bem exploradas, contribuirao substancialmente para o aumento da producao de milho no Estado.
Tipo: Fôlder / Folheto / Cartilha (INFOTECA-E) Palavras-chave: Cultivo; Brasil; Amazonas; Humaita; Maize.; Milho; Variedade; Zea Mays.; Crop management; Varieties..
Ano: 2000 URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/670183
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Cuticle and cuticular wax development in the sunflower (Helianthus annuus L.) pericarp grown at the field under a moderate water deficit Phyton
Franchini1,MC; Hernández,LF; Lindström,LI.
Wax in the sunflower (Helianthus annuus L.) pericarp is an important morphological feature that interferes with oil quality and varies with crop management and environmental conditions. We studied the effect of a moderate water deficit (MWD) generated from early to late anthesis on quantitative development of the cuticle, and qualitative and quantitative development of the cuticular waxes (CW) of the pericarp in two hybrids grown under field conditions. The experiment was repeated during two consecutive seasons (Exp-I and Exp-II). At harvest maturity (HM), plants grown under a MWD showed higher CW content (31 to 47%) and thicker cuticles (13%) in both experiments compared to controls. Epicuticular wax (ECW) crystals showed a granular morphology. Also a...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Cuticular waxes; Oil quality; Crop management; Hull; Anthesis; Harvest Maturity; Hybrid; Helianthus annuus L..
Ano: 2010 URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-56572010000200007
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Diversity of parasitoid wasps in conventional and organic guarana (Paullinia cupana var. sorbilis) cultivation areas in the Brazilian Amazon Acta Amazonica
SCHOENINGER,Karine; SOUZA,Jorge L.P.; KRUG,Cristiane; OLIVEIRA,Marcio L..
ABSTRACT We surveyed parasitoid wasps (Hymenoptera) in two guarana plantations in the central Brazilian Amazon (one conventionally, and one organically managed), as well as in adjacent forest and edge areas between crop and forest. We evaluated differences between management systems in parasitoid diversity and abundance, and assessed the importance of the surrounding matrix as a source of parasitoid wasps for guarana cultivation. Parasitoid wasp richness, abundance and taxonomic composition (at family level) were compared between plantations, and among habitats within plantations. Wasps were sampled using Malaise and Moericke traps. A total of 25,951 parasitoid wasps (10,828 in the conventional, and 15,123 in the organic crop area) were collected, and were...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Agroecosystem; Chalcidoidea; Crop management; Encyrtidae; Natural enemies.
Ano: 2019 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672019000400283
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EFFECT OF PLANTING DENSITIES OF “BRS PRINCESS” BANANA TREE IN THE SUPPRESSION OF WEEDS Planta Daninha
LANZA,T.R.; MACHADO,A.F.L.; MARTELLETO,L.A.P..
ABSTRACT The objective is to evaluate the effects of plant density in banana crops against weed suppression. Six treatments were used: 1,200 (3.33 x 2.5 m), 1,600 (2.5 x 2.5 m), 2,000 (2.0 x 2.5 m), 2,400 (1.67 x 2.5 m), 2,800 (1.43 x 2.5 m) and 3,200 (1.25 x 2.5 m) banana plants per hectare, arranged in an experimental design of randomized blocks with four replications. The phytosociological study of weed communities was carried out one month after transplanting and then every 90 days, totaling six samples in 16 months of cultivation, always those being held 15 days after mowing. With the data of dry mass and number of individuals per species Relative density (De.R) Relative frequency (Fr.R) Relative dominance (Do.R), importance value value (IVI) of weed...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Banana crop; Phytosociology; Crop management.
Ano: 2017 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582017000100252
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Evolution of social science research at ICRISAT, and a case study in Zimbabwe Open Agri
J.D..
Palavras-chave: Social sciences; Crop management; Cash flow; Assets; Synergism; Farm inputs; Agricultural credit; Strategies; Policies; Weather hazards.
Ano: 2005 URL: http://agropedia.iitk.ac.in/openaccess/?q=node/3321
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Four-way data analysis within the linear mixed modelling framework Scientia Agricola
Studnicki,Marcin; Mądry,Wiesław; Derejko,Adriana; Noras,Kinga; Wójcik-Gront,Elżbieta.
Cultivars have to be evaluated under different crop management systems across agro-ecosystems and years using multi-environment trials (MET) before releasing them to the market. Frequently, data collected in METs are arranged according to cultivar (G), management (M), location, (L) and year (Y) combinations in a four-way G x M x L x Y data table that is highly unbalanced for cultivars across locations and time. Therefore, we present the restricted maximum likelihood method (REML) for linear mixed models (LMM) with a factor analytic variance-covariance matrix for assessing cultivar adaptation to crop management systems and environments based on unbalanced datasets. Such a multi-environmental trial system has been in operation in Poland for winter wheat...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Crop management; Restricted maximum likelihood methods; Unbalanced data; Winter wheat.
Ano: 2015 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162015000500411
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FUZZY MODELING OF THE EFFECTS OF IRRIGATION AND WATER SALINITY IN HARVEST POINT OF TOMATO CROP. PART I: DESCRIPTION OF THE METHOD REA
Viais Neto,Daniel dos S.; Cremasco,Camila P.; Bordin,Deyver; Putti,Fernando F.; Silva Junior,Josué F.; Gabriel Filho,Luís R. A..
ABSTRACT It was used statistical techniques for the evaluation of agricultural experiments, but there are mathematical theories that allow finer adjustments, highlighting among them, the fuzzy logic. The objective of the study was characterizing a method of fuzzy modeling from an agronomic experiment. For this study it was used data from an experiment conducted at the School of Agriculture of São Paulo State University (UNESP) in Botucatu-SP. The system input variables based in fuzzy rules were soil water tension and doses of water salinity, being defined three fuzzy sets. The output variables was elected from the biometric and productivity analysis that showed statistically significant differences, namely, plant height, stem diameter, leaf area, green...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Fuzzy logic; Drought; Salt stress; Crop management.
Ano: 2019 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162019000300294
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Groundwater pollution and emerging environmental challenges of industrial effluent irrigation in Mettupalayam Taluk, Tamil Nadu AgEcon
Mukherjee, Sacchidananda; Nelliyat, Prakash.
Industrial disposal of effluents on land and the subsequent pollution of groundwater and soil of surrounding farmlands – is a relatively new area of research. The environmental and socioeconomic aspects of industrial effluent irrigation have not been studied as extensively as domestic sewage based irrigation practices, at least for a developing country like India. The disposal of effluents on land has become a regular practice for some industries. Industries located in Mettupalayam Taluk, Tamil Nadu, dispose their effluents on land, and the farmers of the adjacent farmlands have complained that their shallow open wells get polluted and also the salt content of the soil has started building up slowly. This study attempts to capture the environmental and...
Tipo: Working or Discussion Paper Palavras-chave: Groundwater; Water pollution; Income; Water quality; Irrigation water; Effluents; Wells; Drinking water; Domestic water; Households; Soil salinity; Crop management; Agricultural and Food Policy; Crop Production/Industries; Resource /Energy Economics and Policy.
Ano: 2007 URL: http://purl.umn.edu/91902
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Guia de bolso: diagnose e manejo de doenças e pragas do cafeeiro na Amazônia. Infoteca-e
VIEIRA JUNIOR, J. R.; COSTA, J. N. M..
A busca por cultivos de café bem manejados do ponto de vista sanitário é questão essencial. E, em se tratando do ambiente Amazônico, as condições edafoclimáticas (temperatura e pluviosidade média elevadas) constituem-se grande desafio aos cafeicultores e técnicos envolvidos no manejo da cultura, diferindo?se significativamente das demais regiões produtoras Nesse sentido, torna-se premente a correta identificação dos problemas fitossanitários associados à cultura, de forma a facilitar as decisões referentes às necessidades de qual, quando e como realizar o manejo. Objetiva-se assim auxiliar os produtores, técnicos e demais interessados na cultura do cafeeiro, como uma fonte de consulta rápida e portátil, auxiliando a tomada de decisões, por meio de...
Tipo: Livro técnico (INFOTECA-E) Palavras-chave: Coffee plant; Cafezal; Doença de Planta; Praga de Planta; Identificação; Manejo; Pratica Cultural; Plant diseases and disorders; Plant pests; Pathogen identification; Plant cultural practices; Crop management; Amazonia.
Ano: 2020 URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1125364
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Guia prático de manejo de açaizais para produção de frutos. Infoteca-e
QUEIROZ, J. A. L. de; MOCHIUTTI, S..
O açaizeiro (Euterpe oleracea, Mart.) é uma palmeira que ocorre nas florestas de várzea do estuário amazônico e em áreas úmidas de terra-firme, chamadas de grotas. Nas várzeas do estuário amazônico, os açaizeiros apresentam grandes densidades e trouçeiras com elevado número de estirpes, convivendo em harmonia com as demais espécies que ocorrem na floresta. Neste ambiente a produção de frutos é boa e ocorre naturalmente durante o ando todo, sendo que em alguns meses há produção de muitos frutos e em outros meses produção de poucos frutos, o que resulta em grande oscilação em seu preço.
Tipo: Fôlder / Folheto / Cartilha (INFOTECA-E) Palavras-chave: Acaizal; Acaizeiro; Amapá; Brasil; Environments; Fruit; Harvest; Macapá; Management; Manejo florestal; Processing; Producao de frutos; Production; Tree.; Açaí; Árvore; Biodiversidade; Colheita; Euterpe Oleracea; Fruta; Fruticultura; Fruto; Manejo; Meio Ambiente; Produção; Processamento; Recurso Natural.; Biodiversity; Forest management; Crop management; Natural resources..
Ano: 2012 URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/964364
Registros recuperados: 52
Primeira ... 123 ... Última
 

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