An evaluation of soil nitrogen testing considering the carry-over effect

被引：1
作者：
Huang, WY
Lu, YC
Uri, ND
机构：
[1] Econ Res Serv, USDA, Washington, DC 20036 USA
[2] ARS, USDA, Beltsville, MD 22311 USA
来源：
JOURNAL OF SUSTAINABLE AGRICULTURE | 1999年 / 13卷 / 03期
关键词：
fertilizer use model; nitrogen carry-over; nitrogen fertilization; nitrogen runoff; soil N-testing;
D O I：
10.1300/J064v13n03_03
中图分类号：
S [农业科学];
学科分类号：
09 ;
摘要：
In order to evaluate the economic and environmental consequences of soil nitrogen tests, this paper combines a dynamic fertilizer use decision model with a crop production model. The preside-dress soil N-test is evaluated for a hypothetical farmer growing corn at the ARS Sustainable Agriculture Demonstration Farm site in southern Maryland. For a farmer not currently using a soil N-test, adoption of this technology can lead to the enhancement of net farm income and the reduction in nitrogen loss to the environment. This will transpire only if the farmer is currently underestimating nitrogen carry-over by more than 25 percent or applying nitrogen fertilizer based solely on an expected plateau-yield goal.
引用
收藏
页码：5 / 34
页数：30
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