期刊
SOIL SCIENCE SOCIETY OF AMERICA JOURNAL
卷 79, 期 5, 页码 1482-1495出版社
SOIL SCI SOC AMER
DOI: 10.2136/sssaj2015.02.0084
关键词
-
类别
资金
- USDA-NIFA [2011-68002-30190]
- Iowa Department of Agriculture and Land Stewardship, Division of Soil Conservation and Water Quality through Iowa General Assembly
Winter rye (Secale cereale L.) cover crop (RC) has potential to reduce NO3-N loss from corn (Zea mays L.) and soybean [Glycine max (L.) Merr.] fields. However, RC effects on annual crop productivity and corn optimal N fertilization requirement are unclear. The objectives were to evaluate corn and soybean yield response to RC and corn optimal N rate. Treatments were no-RC and RC with six fertilizer N rates (0-225 kg N ha(-1)) applied to corn in a no-till corn-soybean (CS) rotation at four Iowa sites in 2009 through 2011. The RC biomass and N uptake was low, with a maximum of 1280 kg dry matter (DM) ha(-1) and 26 kg N ha(-1), respectively. In the no-N control, the RC reduced soil profile NO3-N by 15 kg N ha(-1) only at time of RC control before corn planting. Corn canopy sensing, plant height, and plant population indicated more N stress, reduced plant stand, and slower growth with RC. The RC reduced corn grain yield by 6% at the economic optimum N rate (EONR). The EONR was the same with no-RC and RC, but plant N uptake efficiency (PUE) was reduced at low N rates with RC, but not above the EONR. Soybean yield was not affected by RC. Results indicate N fertilization rate should be the same with or without RC. Improvement in RC systems and management could make RC a more viable practice within no-till corn and soybean production.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据