Suitability of peanut residue as a nitrogen source for a rye cover crop

被引:18
作者
Balkcom, Kipling Shane [1 ]
Wood, Charles Wesley
Adams', James Fredrick
Mesol, Bernard
机构
[1] USDA ARS, Soil Dynam Res Unit, Auburn, AL 36832 USA
[2] Auburn Univ, Dept Agron & Soils, Auburn, AL 36849 USA
来源
SCIENTIA AGRICOLA | 2007年 / 64卷 / 02期
关键词
N immobilization; N mineralization; legume; nitrogen fertilizer;
D O I
10.1590/S0103-90162007000200012
中图分类号
S [农业科学];
学科分类号
09 ;
摘要
Leguminous winter cover crops have been utilized in conservation systems to partially meet nitrogen (N) requirements of succeeding summer cash crops, but the potential of summer legumes to reduce N requirements of a winter annual grass, used as a cover crop, has not been extensively examined. This study assessed the N contribution of peanut (Arachis hypogaea L.) residues to a subsequent rye (Secale cereale L.) cover crop grown in a conservation system on a Dothan sandy loam (fine-loamy, kaolinitic, thermic Plinthic Kandiudults) at Headland, AL USA during the 2003-2005 growing seasons. Treatments were arranged in a split plot design, with main plots of peanut residue retained or removed from the soil surface, and subplots as N application rates (0, 34, 67 and 101 kg ha(-1)) applied in the fall. Peanut residue had minimal to no effect on rye biomass yields, N content, carbon (C) /N ratio, or N, P, K, Ca and Zn uptake. Additional N increased rye biomass yield, and N, P, K, Ca, and Zn uptakes. Peanut residue does not contribute significant amounts of N to a rye cover crop grown as part of a conservation system, but retaining peanut residue on the soil surface could protect the soil from erosion early in the fall and winter before a rye cover crop grows sufficiently to protect the typically degraded southeastern USA soils.
引用
收藏
页码:181 / 186
页数:6
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