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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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| Kampas, Athanasios; Mamalis, Spyridon. |
| Although the initial allocation of pollution permits is neutral in terms of efficiency, it does have a significant impact on distributive equity. In this paper, we examine the two main categories of permit allocation rules, the distributive and the reductive, for controlling phosphorus pollution in a small catchment in South West England. Based on the premise that the regulatory choice compromises efficiency and equity, the main result of this paper is that an allocation of permits in proportion to the intensity of environmental preferences is a “win-win” choice. The reason is that it simultaneously achieves two goals. First, it is efficient (or cost-effective) since a permit system achieves a prespecified target at a minimum abatement cost, while second,... |
| Tipo: Journal Article |
Palavras-chave: Pollution permits; Phosphorus; Nutrient management; Export coefficient model; Water quality; Distributive justice; Income inequality; Atkinson Index; Environmental Economics and Policy. |
| Ano: 2006 |
URL: http://purl.umn.edu/44115 |
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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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| Claassen, Roger; Breneman, Vincent E.; Bucholtz, Shawn; Cattaneo, Andrea; Johansson, Robert C.; Morehart, Mitchell J.. |
| Since 1985, U.S. agricultural producers have been required to practice soil conservation on highly erodible cropland and conserve wetlands as a condition of farm program eligibility. This report discusses the general characteristics of compliance incentives, evaluates their effectiveness in reducing erosion in the program's current form, and explores the potential for expanding the compliance approach to address nutrient runoff from crop production. While soil erosion has, in fact, been reduced on land subject to Conservation Compliance, erosion is also down on land not subject to Conservation Compliance, indicating the influence of other factors. Analysis to isolate the influence of Conservation Compliance incentives from other factors suggests that about... |
| Tipo: Report |
Palavras-chave: Conservation compliance; Sodbuster; Swampbuster; Conservation policy; Agri-environmental policy; Nutrient management; Buffer practices; Agricultural and Food Policy. |
| Ano: 2004 |
URL: http://purl.umn.edu/34033 |
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| LOPES, M. N.; CÂNDIDO, M. J. D.; GOMES, G. M. F.; MARANHÃO, T. D.; GOMES, E. da C.; SOARES, I.; POMPEU, R. C. F. F.; SILVA, R. G. da. |
| Abstract: Forage biomass production and water storage (WS) was evaluated in cactus pear cv. Gigante fertilized with combinations of nitrogen (10, 70, 100, 130, and 190 kg ha-1 yr-1 N) and phosphorus (10, 70, 100, 130, and 190 kg ha -1 yr -1 P2O5) in annual (AH) and biennial (BH) harvest frequencies, in Quixadá and Tejuçuoca, Brazil. A randomized complete block design was used in a split-plot arrangement with four replications. In Quixadá, the maximum total forage biomass (TFB) recorded in the AH was 3,522.9 kg ha -1 yr -1 for the N/P2O5 combination of 134.6/190.0 kg ha -1 yr -1, and in the BH, the maximum TFB of 1,583.2 kg ha -1 yr -1 was recorded for the N/P2O5 combination of 114.6/136.8 kg ha -1 yr -1. In Tejuçuoca, the maximum TFB recorded in the AH was... |
| Tipo: Artigo de periódico |
Palavras-chave: Harvest frequency; Water accumulation; Feed crops; Opuntia Ficus Indica; Planta Forrageira; Palma Forrageira; Nutrient management; Biomass production; Opuntia ficus-indica; Forage crops. |
| Ano: 2021 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1133217 |
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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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| Registros recuperados: 28 | |
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