The effects of crop residues (two legumes, two grasses and corn) on denitrification, dissimilatory nitrate reduction, mineralization and immobilization of nitrogen in soil.

TL;DRAbstract

Since cover crops and intercrops are increasingly used to reduce soil erosion, N loss, and to provide efficient N utilization, it is important to evaluate the consequences of crop residues to N cycling processes. The objectives were to determine effects of incorporation of Vicia villosa L., Hairy vetch (HV); Trifolium pratense L., Red clover (RC); Lolium temulentum L., Annual ryegrass (ARG); Phalaris arundinacea L., Reed canarygrass (RCG); and Zea mays L., corn residues on denitrification, dissimilatory nitrate reduction, and N mineralization/immobilization in a Brookston clay loam (Typic Agriaquoll). With anaerobic-only incubation and when soils were not amended with NO$\\sb3\\sp-$, all residues stimulated denitrification resulting in NO+N$\\sb2$O production 2 times greater than that in the control soil. There was no response in NH$\\sb4\\sp+$ production. The initial addition of NO$\\sb3\\sp-$ not only increased denitrification losses of NO+N$\\sb2$O on average by 55% but also stimula

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