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Abstract
Crop residue (CR) management wasa superim posed treatmentin soybean-maizerot ationandinterc ropping systems. Thisstudy quantified Ninab scised soybean leaves. Soybean- Nderived from the atmosphere (%NDfA) ranged
between 41–65%; it was higher (P< 0.05)in RT (55.6%) than in CT (46.6%). Total fixed-N under ‘RT + CR’ was more than in theothertre atmen tsbyatleast 55% in intercroppingand 34% inrotationsystem. Nitrogen
fixedinsoyb eanabo veground partswas 26–48kgNha−1 within tercrop pingand 53–82 kg N ha−1with rotation. Seasonal litter fall contained about 15 kg N ha−1, with 54%
NDfA. Annual nitrogen balances with soybeanand maize grain removed were better in RT (−9to−32kg Nha−1)thaninCT(−40to−60kgNha−1). Application of Pincreased noduleweight (P<0.05)by3to16 time soverth econtrol. Soybean residues shouldbe
returnedto thefi eldafterharv esttored ucesoil Nmining. Weconcludethat‘RT+C
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