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Registros recuperados: 17 | |
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Jesús Lozano, Luis. |
El objetivo de este estudio fue determinar un patrón óptimo de cultivos en el sector agrícola de la Comarca Lagunera considerando de manera simultánea la maximización de la ganancia y la minimización del consumo de agua, dos criterios de optimización usualmente en conflicto. Se formularon dos modelos, uno de programación lineal para replicar el patrón actual de cultivos como base de referencia en el análisis comparativo, y un segundo modelo de programación compromiso que considera de manera simultánea los objetivos en conflicto. Los resultados indican que una estructura productiva más eficiente que la actual, debería considerar el aumento de la superficie de hortalizas ya que estos cultivos consumen sólo el 5% del recurso agua, pero aportan 21% del... |
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Palavras-chave: Productividad del agua; Programación lineal; Programación compromiso; Water productivity; Linear programming; Compromise programming; Maestría; Economía. |
Ano: 2012 |
URL: http://hdl.handle.net/10521/691 |
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BOULAY, A. M.; DRASTIG, K.; AMANULLAH; CHAPAGAIN, A.; CHARLON, V.; CIVIT, B.; CAMILLIS, C. DE; SOUZA, M. DE; HESS, T.; HOEKSTRA, A. Y.; IBIDHI, R.; LATHUILLIERE, M. J.; MANZARDO, A.; MCALLISTER, T.; MORALES, R. A.; MOTOSHITA, M.; PALHARES, J. C. P.; PIRLO, G.; RIDOUTT, B.; RUSSO, V.; SALMORAL, G.; SINGH, R.; VANHAM, D.; WIEDEMANN, S.; ZHENG, W.; PFISTER, S.. |
The FAO Livestock Environmental Assessment and Performance (LEAP) Partnership organised a Technical Advisory Group (TAG) to develop reference guidelines on water footprinting for livestock production systems and supply chains. The mandate of the TAG was to i) provide recommendations to monitor the environmental performance of feed and livestock supply chains over time so that progress towards improvement targets can be measured, ii) be applicable for feed and water demand of small ruminants, poultry, large ruminants and pig supply chains, iii) build on, and go beyond, the existing FAO LEAP guidelines and iv) pursue alignment with relevant international standards, specifically ISO 14040 (2006)/ISO 14044 (2006), and ISO 14046 (2014). The recommended... |
Tipo: Artigo de periódico |
Palavras-chave: Water footprinting; Water productivity; Water scarcity footprint; Water use assessment; Livestock production. |
Ano: 2021 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1137681 |
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Amirouche, mawhoub. |
The search for decision-making tools is essential in order to control agricultural practices and plan for sustainable agriculture that respects the environment. To this end, FAO has developed an evaluation model called AquaCrop, which covers most technical routes, including fertilization. In this perspective, this study focuses on the AquaCrop model (v6.1) to calibrate it for the simulation of lettuce crop yields (Lactuca sativa L), under different fertilization levels for the trial periods (2015/2016) and (2016/2017). Four levels of fertilization were examined under rain conditions, namely T1 (0 kg N/ha), T2 (60 kg N/ha), T3 (120 kg N/ha) and T4 (180 kg N/ha). The model performance was evaluated using the coefficient of determination (R2), the square root... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: AquaCrop; Lettuce; Calibration; Validation; Fertility stress; Water productivity. |
Ano: 2021 |
URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/6195 |
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TEIXEIRA, A. H. de C.; LEIVAS, J. F.; SILVA, G. B. S. da. |
Onze imagens Landsat 8, sendo três para 2014 e oito para 2015, e dados agrometeorológicos foram usados na modelagem da evapotranspiração (ET) e da produção de biomassa (BIO) em larga escala através da aplicação conjunta do algoritmo Simple Algorithm for Evapotranspiration Retrieving (SAFER) e do modelo da interceptação da radiação de Monteith, no Perímetro Irrigado Nilo Coelho, em Petrolina, PE. A inclusão das imagens do ano de 2014 foi devido à ausência de imagens sem nuvens durante o período chuvoso de 2015. As maiores taxas para ambos, ET e BIO, bem como as mais elevadas variações espaciais ocorreram em janeiro, dentro da estação chuvosa, sendo as médias respectivas de 3,6 ± 2,1 mm dia-1 e 112 ± 92 kg ha-1 dia-1. Os valores mais baixos correspondentes... |
Tipo: Anais e Proceedings de eventos |
Palavras-chave: Demanda atmosférica; Produtividade da água; Atmospheric demand; Water productivity; Recurso hídrico; Water resources. |
Ano: 2016 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1062775 |
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Magalhães,Diogo Barreto; Donato,Sérgio Luiz Rodrigues; Santos,Marcelo Rocha dos; Brito,Cleiton Fernando Barbosa; Fonseca,Varley Andrade; Souza,Bruno Soares de. |
Abstract Yield-improving and water-saving techniques assume great importance in the cultivation of banana plants under semiarid regions, prone to greater climate variability. The objective of this study was to evaluate yield and water-use efficiency (WUE) response of ‘Prata-Anã’ banana plants to combinations of plant densities and irrigation levels: three irrigation levels, 50, 75 and 100% crop evapotranspiration (ETc), and four plant densities, 1,666 (3.0 x 2.0 m), 2,083 (3.0 x 1.6 m), 2,666 (3.0 x 1.25 m) and 3,333 (3.0 x 1.0) plants ha-1, evaluated in two production cycles. The treatments were laid out in a randomized block design with four replicates. Increasing plant density up to 3,333 plants ha-1 induced reductions in number of leaves at harvest and... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Musa spp.; Water productivity; Dense planting. |
Ano: 2020 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-29452020000506002 |
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Registros recuperados: 17 | |
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