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共检索到30条 ,权限内显示50条;
Water Conservation in Irrigated Agriculture: Trends and Challenges in the Face of Emerging Demands
- 关键词：
- Agricultural water conservation irrigated agriculture irrigation efficiency water supply and demand irrigation technologies water management practices water conservation policy
- 年份：
- 2012
- 摘要：
- States that account for nearly three-quarters of U.S. irrigated agriculture. De ...
The Ethanol Decade: An Expansion of U.S. Corn Production, 2000-09
- 关键词：
- Corn soybeans ethanol yields Agricultural Resource Management Survey ARMS acreage bioenergy ethanol indirect effects
- 年份：
- 2011
- 摘要：
- uncultivated hay to cropland, and the expansion of double cropping (co ...
Trends and Developments in Hog Manure Management: 1998-2009
- 年份：
- 2011
- 摘要：
- ller areas. With less cropland for spreading the manure, hog farmers ma ...
Major Uses of Land in the United States, 2007
- 关键词：
- agricultural land
- 年份：
- 2011
- 摘要：
- ); grassland pasture and rangeland at 614 million (27 percent); cropland...
Nitrogen in Agricultural Systems: Implications for Conservation Policy
- 关键词：
- Reactive nitrogen nitrogen management fertilizer water quality greenhouse gas economic incentives conservation policy regulation
- 年份：
- 2011
- 摘要：
- nitrogen management and identifies issues affecting their potential performance ...
Grassland to Cropland Conversion in the Northern Plains: The Role of Crop Insurance, Commodity, and Disaster Programs
- 关键词：
- cropland
- 年份：
- 2011
- 摘要：
- e grasslands being converted to cropland in the United States and espec ...
Manure Use for Fertilizer and for Energy: Report to Congress
- 关键词：
- Manure fertilizer fertilizer nutrients energy corn dairy hogs Agricultural Resource Management Survey (ARMS)
- 年份：
- 2009
- 摘要：
- of fertilizer, and its other uses. About 5 percent of all U.S. cropland...
Commodity Payments, Farm Business Survival, and Farm Size Growth
- 关键词：
- cropland
- 年份：
- 2007
- 摘要：
- In the last 25 years, U.S. crop farms have steadily declined in number and grown ...
Major Uses of Land in the United States, 2002
- 关键词：
- agricultural land
- 年份：
- 2006
- 摘要：
- .8 percent); grassland pasture and range land, 587 million acres (25.9 percent); ...
Possible Implications for U.S. Agriculture From Adoption of Select Dietary Guidelines
- 关键词：
- Agriculture dairy Dietary Guidelines for Americans dietary recommendations food food consumption food production Food Guidance System fruit MyPyramid
- 年份：
- 2006
- 摘要：
- U.S. cropland in 2002. To meet the dairy guidelines, consumption of mi ...
