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| Registros recuperados: 28 | |
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| Koocheki, Alireza; Ferdowsi University of Mashhad; Nassiri Mahallati, Mehdi; Ferdowsi University of Mashhad; Mansoori, Hamed; Ferdowsi University of Mashhad; Moradi, Rooholla; Ferdowsi University of Mashhad. |
| Increasing resource use efficiency is crucial for enhancement of agricultural productions and reducing environmental hazards. For this purpose, improvement of Nitrogen use efficiency is an effective approach. Not only N loss occurs in field but also in processing course of food utilization. The objective of this study was to evaluate N loss and efficiency from production to consumption for wheat and maize. For this purpose, data for the amount of applied nitrogen, acreage, yields, amount of returned residue were collected and a proportion of N allocated to different source of food or feed was also traced. Results showed that total N harvested by wheat and maize were 387 and 81.7 kt and N use efficiency for the same crops were 25 and 60%, respectively.... |
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Palavras-chave: N use efficiency; N loss; Nutrient management; Fertilizer Environment. |
| Ano: 2013 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/16039 |
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| Hirzel,Juan; Undurraga,Pablo; González,Jorge. |
| Long-term crop rotation systems can benefit soil chemical-physical properties and crop productivity. The lack of information on the effect of long-term crop rotations on soil chemical-physical properties for volcanic soils in Chile could restrict reaping real benefits, and make it difficult to take agricultural management decisions, which could lead to possible negative consequences on some soil chemical-physical properties and the environment. The development of information associated with the effect on soil chemical-physical properties with respect to long-term rotation systems and their fertilization management contribute to improving agronomic management decisions for these soils. A study was carried out to assess the effect of six rotation systems... |
| Tipo: Journal article |
Palavras-chave: Crop rotation; Andisol; Nutrient management; Soil fertility. |
| Ano: 2011 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392011000200016 |
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| QUEIROZ, J. F. de; ALVES, J. M. C.; LOSEKANN, M. E.; FRASCA-SCORVO, C. M. D.; SCORVO FILHO, J. D.; FERRI, G. H.; ISHIKAWA, M. M.. |
| Resumo: Este documento tem como objetivo principal apresentar um conjunto de Boas Práticas de Manejo (BPM) para o manejo alimentar de peixes em viveiros escavados e, também, alguns exemplos de BPM para tanques-rede. Os principais aspectos referentes ao manejo alimentar e seus efeitos são apresentados em tabelas onde estão indicadas as causas e as consequências dos problemas que afetam diretamente a produção de peixes, assim como relaciona as BPM mais apropriadas para solucioná-los e/ou evitá-los. |
| Tipo: Folhetos |
Palavras-chave: Manejo alimentar; Tilápia; Oreochromis Niloticus; Qualidade da Água; Manejo; Pratica Cultural; Nutrição Animal; Water quality; Nutrient management; Tilapia (common name); Water management. |
| Ano: 2021 |
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1131706 |
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| Christensen, Lee A.. |
| Corn production uses over 25 percent of the Nation's cropland and more than 40 percent of the commercial fertilizer applied to crops. Thus, corn farmers' choices of soil, nutrient, and water management systems can have a major impact not only on their own profitability, but also on the environment. If sound economic and environmental choices are to be encouraged, it may help to assess relationships between operator and farm characteristics and the adoption of management techniques by corn farmers. Data from the 1996 Agricultural Resource Management Survey (ARMS) of U.S. corn farms and producers are analyzed for this purpose, supplemented by a literature survey on factors that influence corn farm management choices. Relationships were found between certain... |
| Tipo: Report |
Palavras-chave: ARMS; Soil management; Nutrient management; Irrigation systems; Profitability; Socioeconomic variables; Crop Production/Industries. |
| Ano: 2002 |
URL: http://purl.umn.edu/33618 |
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| Stott, Kerry; Doole, Graeme J.; Vigiak, Olga; Kumaran, Thabo; Roberts, Anna M.. |
| Ambitious nutrient reduction targets have been set for the Gippsland Lakes, Victoria but at what cost to productive agriculture? An interdisciplinary approach is addressing this question for the Moe River catchment, a dairy-dominated catchment that is a major source of pollutants to the Gippsland Lakes. Off-farm nitrogen exports are being estimated by biophysical modellers, and economists are quantifying the impact of farming systems and agricultural practices on farm profitability. This information is assembled to form the interim profit-pollution frontier for nitrogen reported in this paper, and to calculate abatement costs. Phosphorus and sediment exports will be considered in future work. This information is intended for use in a landscape-optimisation... |
| Tipo: Presentation |
Palavras-chave: Nutrient management; Profit-pollution frontiers; Abatement costs.; Farm Management. |
| Ano: 2012 |
URL: http://purl.umn.edu/124454 |
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| Registros recuperados: 28 | |
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