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| Registros recuperados: 2.368 | |
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| Bouis, Howarth E.. |
| Breeding for food-staple plant varieties that load high amounts of iron and zinc in their seeds holds great promise for making a significant, low-cost, and sustainable contribution to reducing iron and zinc deficiencies in humans in developing countries. This strategy also may well have important spinoff effects for increasing farm productivity in developing countries in an environmentally-beneficial way. Understanding how household incomes, food prices, and culturally-based preference patterns interact to drive food consumption and nutrient intake patterns can provide crucial background information for designing effective nutrition intervention programs. Research in both of these areas is being pursued under a five-year project organized by the... |
| Tipo: Working or Discussion Paper |
Palavras-chave: Food Consumption/Nutrition/Food Safety. |
| Ano: 1994 |
URL: http://purl.umn.edu/49996 |
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| Smith, Katherine R.. |
| It is proposed that "real" research issues are socially relevant, provide findings with utility beyond the profession, and are anticipatory. An industrializing agricultural sector, an evolving political economy of agroenvironmental policy, an increasingly transnational economy, and rapid population growth are important sources of change to which research on real agroenvironmental issues must respond. Specific, identified "real" research issue areas include: benefit-risk assessment methodology; agroenvironmental regulation for industrialized agriculture; trade agreements and environmental quality; the recreation-tourism-agriculture interface; sustainable development; and the formation of preferences. The nature of identified issues suggests more... |
| Tipo: Journal Article |
Palavras-chave: Research and Development/Tech Change/Emerging Technologies. |
| Ano: 1994 |
URL: http://purl.umn.edu/31434 |
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| Current, Dean. |
| This paper summarizes results of the evaluation of 11 forestry activities in Central America using a framework of factors related to long term sustainability of the benefits flowing from forestry development activities. Identified problems included: the lack of continuity of support to project sponsored activities once formal projects end, the short term focus of many projects, the lack of interest or capacity of host governments and institutions to provide continued support to these activities, and restrictive permit procedures and legislation that discourage tree management. Factors that contribute to sustainability include the participation and training of local farmers as promoters, trainers, and employees of projects. Another factor is farmer... |
| Tipo: Working or Discussion Paper |
Palavras-chave: Resource /Energy Economics and Policy. |
| Ano: 1994 |
URL: http://purl.umn.edu/11889 |
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| Siewerdt,Frank; Farias,José Viriato da Silva; Osório,José Carlos da Silveira; Jacondino,Ilo Francisco Ribeiro. |
| Data from 82 purebred and crossbred Large White and Duroc barrows and gilts were used to describe the growth of carcass primal cuts, of tissues, and of several organs. Pigs were allowed ad libitum to a conventional diet, which contained com and soybean meal. Pigs were weighted weekly and were slaughtered when attained a liveweight over 90kg. An allometric pattern of growth was assumed. Within the observed range of liveweight, the carcass grew slower than the whole animal. An increase of carcass weight corresponds to a similar increase of lean, but also corresponds to a larger increase of fat tissues. A suggestion to slaughter pigs near to 90kg of liveweight is presented, in order to obtain leaner carcasses. |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Allometric growth; Carcasses; Pigs. |
| Ano: 1994 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84781994000300031 |
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| Smith, Vincent H.; Chouinard, Hayley H.; Baquet, Alan E.. |
| Using yield data for a sample of 123 dryland wheat producers in Montana, the effects of three area yield contracts, including the contract currently offered by the United States Federal Crop Insurance Corporation and two individual yield contracts on individual farm yield variability, are examined. The results indicate that while the Federal Crop Insurance Corporation area yield contract provides all farmers in the sample with some protection against yield variability, a simpler, actuarially equivalent "almost ideal" area yield contract provides substantially larger reductions in yield variability. However, actuarially equivalent individual yield contracts provide levels of protection against yield variability similar to those obtained under the "almost... |
| Tipo: Journal Article |
Palavras-chave: Risk and Uncertainty. |
| Ano: 1994 |
URL: http://purl.umn.edu/31315 |
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| Frizzone,J.A.; Botrel,T.A.; Arce,R.A.B.; Péres,F.C.. |
| Com o objetivo de desenvolver um modelo de programação linear para simular os níveis das atividades do processo de produção, utilizou-se o sistema de produção da fazenda Lagoa do Fogão, propriedade da família Sakai, localizada no município de Guaíra,SP, com um total de 207 ha irrigados por três sistemas de irrigação do tipo pivô-central. A função objetivo consistiu em maximizar o lucro da propriedade agrícola, utilizando as culturas de inverno tradicionalmente cultivadas nessa propriedade, sob regime de irrigação, a saber: tomate industrial, trigo, batata, ervilha e feijão. As restrições foram quanto à disponibilidade de terra, água e mercado. Os resultados obtidos, permitiram as seguintes conclusões: (a) na área sob o pivô-central 1 deve-se cultivar... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Programação linear; Alocação de água; Pivô-central. |
| Ano: 1994 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161994000300026 |
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| Buriot,Galileo Adeli; Streck,Nereu Augusto; Gimenes,Eliseo Salvatierra; Schneider,Flávio Miguel. |
| RESUMO Foram determinadas alterações micrometeorológicas causadas por tela plástica preta com 18, 30 e 50% de atenuação da radiação solar incidente, durante os meses de verão, em Santa Maria, RS. O experimento foi conduzido no Campo Experimental do Departamento de Fitotecnia da UFSM, onde foram cultivados quatro canteiros com alface, três deles cobertos com túneis de tela plástica. O estudo foi realizado em 3 períodos: de 30/11/90 a 17/01/91, de 06/02/91 a 25/03/91 e de 10/12/91 a 01/03/92. Mediu-se a radiação solar global, radiação solar na faixa de comprimento de onda do infravermelho e a luminosidade, temperatura diurna do solo, temperatura mínima e diurna do ar e umidade do solo e do ar. Os resultados mostraram que a temperatura do solo e do ar e a... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Radiação solar; Temperatura do solo e do ar; Tela plástica; Sombreamento. |
| Ano: 1994 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84781994000100001 |
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| Registros recuperados: 2.368 | |
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