Résultats de la recherche | Land Portal

Résultats de la recherche

Showing items 1 through 9 of 478.
  1. Library Resource
    Articles et Livres
    décembre, 2013
    États-Unis d'Amérique

    A ca. 2010, 30m resolution map depicting annually tilled areas across the conterminous United States was developed. Input sources included fouryears, spanning 2008–2011, of annual national-level coverage Cropland Data Layer (CDL) land cover classifications as produced by the National Agricultural Statistics Service. Derived total land area under tillage from the aggregate CDL product equaled 112.8million hectares (278.7million acres).

  2. Library Resource
    Documents et rapports de conférence
    décembre, 2011
    États-Unis d'Amérique

    Current U.S. farm programs make payments to farmers based in part on historical base acres planted in particular program crops such as corn, soybeans, cotton, wheat and soybeans. Eligibility for payments includes regulations on the crops allowed to be grown on base acres, and there are restrictions on planting horticultural crops on such base acres. The fruits and planting restriction on base acres has potentially influenced the number of acres planted to fruits and vegetables over the past two decades.

  3. Library Resource
    Documents et rapports de conférence
    décembre, 2010
    États-Unis d'Amérique

    Herbicides account for approximately 2.2% of total farm expenses and are applied to more than80% of farmland in the USA. The widespread adoption of herbicides contributed to the increasedand relatively cheaper productivity of modern intensively managed agricultural systems indeveloped countries. The present study uses a hedonic framework to analyze the effect ofselected attributes on the price of corn and soybean herbicides. Two different empirical modelswere estimated separately for the two crops.

  4. Library Resource
    Articles et Livres
    décembre, 2015
    Australie, Brésil, Canada, États-Unis d'Amérique, Inde, Fédération de Russie, Chine

    Groundwater vulnerability assessment is an important task in water resources and land management. The most sophisticated among the vulnerability assessment techniques is the GIS-based DRASTIC model. However, despite its popularity, it is marred with excessive subjectivity glitches; little research has been conducted to address the shortcomings associated with this method. This study investigates various issues regarding the application of the GIS-based DRASTIC model through a critical review of relevant literatures.

  5. Library Resource
    Articles et Livres
    décembre, 2008
    États-Unis d'Amérique

    A new regionalism has been much documented and researched for metropolitan areas; this article documents that there is a new rural regionalism as well. In the United States, these groups appear most likely to emerge in areas that are challenged by outcomes characterizing globalization's effects on the rural condition: namely, exurban or metropolitan sprawl and the resulting landscape fragmentation, often in combination with extreme pressure on the profitability of small farms or other resource uses.

  6. Library Resource
    Articles et Livres
    décembre, 2012
    États-Unis d'Amérique

    There is a growing need to site new power generating plants that use cleaner energy sources due to increased regulations on air and water pollution and a sociopolitical desire to develop more clean energy sources. To assist utility and energy companies as well as policy-makers in evaluating potential areas for siting new plants in the contiguous United States, an adaptation of a geographic information system (GIS)-based multicriteria decision analysis approach is presented in this paper.

  7. Library Resource
    Articles et Livres
    décembre, 2009
    États-Unis d'Amérique

    United States policy makers are promoting bio-fuels as an economic development opportunity, especially for rural America. A USDA study claims that developments in energy production from biomass could increase profits for agricultural commodity producers. However, as William Heffernan and his colleagues have demonstrated, concentration in the agrifood sector limits the economic benefits going to the commodity producers.

  8. Library Resource
    Articles et Livres
    décembre, 2014
    États-Unis d'Amérique

    Land area planted to row crops has expanded globally with increased demand for food and biofuels. Agricultural expansion in the Dakota Prairie Pothole Region (DPPR), USA affects a variety of agricultural and non-agricultural land-use types, including grasslands and wetlands that provide critical wildlife habitat and other ecosystem services. The purpose of this study was to quantify recent changes in rural land cover/land use, analyze trends, and interpret results in relation to climate, agronomic practice, and ethanol production.

  9. Library Resource
    Articles et Livres
    décembre, 2011
    États-Unis d'Amérique

    The increased frequency and severity of large wildfires in the western United States is an important ecological and management issue with direct relevance to amphibian conservation. Although the knowledge of fire effects on amphibians in the region is still limited relative to most other vertebrate species, we reviewed the current literature to determine if there are evident patterns that might be informative for conservation or management strategies.

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