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Showing items 1 through 9 of 29.
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Documents et rapports de conférence
The purpose of this paper has been to present quality-adjusted values for land in the United States and nine European countries using price and quantity data for 1990. Disregarding such differences in the quality-adjusted land input would generate biased estimates of the land input and thus of total factor productivity. Land quality adjustments could potentially be enhanced further with additional data on soil characteristics, climate, and other productivity-related characteristics.
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Colombie, Nicaragua, Honduras, Haïti, Mexique, Amérique du Sud, Amérique centrale, Caraïbes, Amérique septentrionale
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Documents de politique et mémoires
Brésil, États-Unis d'Amérique, Argentine
We develop a new partial equilibrium, four-region world trade model for the soybean complex comprising soybeans, soybean oil, and soybean meal. In the model, some consumers view genetically modified Roundup Ready (RR) soybeans and products as weakly inferior to conventional ones; the RR seed is patented and sold worldwide by a U.S. firm; and producers employ a costly segregation technology to separate conventional and biotech products in the supply chain.
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États-Unis d'Amérique, Chine
The industrial emission of carbon (C) in China in 2000 was about 1 Pg yr 1, which may surpass that of the United States (1.84 Pg C) by 2020. China’s large land area, similar in size to that of the United States, comprises 124 Mha of cropland, 400 Mha of grazing land and 134 Mha of forestland. Terrestrial C pool of China comprises about 35–60 Pg in the forest and 120–186 Pg in soils. Soil degradation is a major issue affecting 145 Mha by different degradative processes, of which 126 Mha are prone to accelerated soil erosion.
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Library Resource
Documents de politique et mémoires
Leafy spurge is an exotic, noxious, perennial weed which is widely established in the north central United States and is an especially serious problem in the northern Great Plains (Bangsund et al. 1999). In 1997, the Agriculture Research Service and Animal Plant Health Inspection Service, U.S. Department of Agriculture, initiated a major Integrated Pest Management (IPM) research and demonstration project to develop and demonstrate ecologically based IPM strategies that can produce effective, affordable leafy spurge control.
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Library Resource
Documents et rapports de conférence
The potential to meet global food demand fully exists through globaldevelopment of the high-technology (HT), high-intensity type of agriculture andfood processing system prevailing in developed countries. This systemunfortunately is also responsible for much natural resource degradation,environmental damage and ecological imbalance. Meantime the Earth's humanpopulation continues to grow, placing ever-increasing demand on global naturalresources, not only for food but also for living and recreational space.
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Library Resource
Privately owned forest lands contribute significant amounts of land for wood supply and recreational opportunities in various parts of Canada including areas within Ontario. The decisions that landowners make about permitting various activities on their lands can impact resource managers and current and potential users of forested environments. In this study, the willingness of Ontario's non-industrial private forest landowners to conduct forest harvesting and to permit hunting and wildlife recreational opportunities is examined.
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Library Resource
The Jornada Experimental Range and the New Mexico State University Chihuahuan Desert Rangeland Research Center are fruitful areas to study the long-term effects of rangeland remediation treatments which started in the 1930s. A number of diverse manipulations were completed under the direction of federal agency and university scientists, and abundant remote sensing imagery is available to assist in relocating the treatments and evaluating their success.
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Library Resource
Estimates of forest area were obtained for the states of Indiana, Iowa, Minnesota, and Missouri in the United States using stratified analyses and observations from forest inventory plots measured in federal fiscal year 1999. Strata were created by aggregating the land cover classes of the National Land Cover Data (NLCD), and strata weights were calculated as proportions of strata pixel counts.
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Library Resource
Documents de politique et mémoires
Leafy spurge is an exotic, noxious, perennial weed which is widely established in the north central United States and is an especially serious problem in the northern Great Plains (Bangsund et al. 1999). In 1997, the Agriculture Research Service and Animal Plant Health Inspection Service, U.S. Department of Agriculture, initiated a major Integrated Pest Management (IPM) research and demonstration project to develop and demonstrate ecologically based IPM strategies that can produce effective, affordable leafy spurge control.
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