Effect of winter cropping Italian ryegrass on N and P leakage from soils

Abstract

Abstract: Based on the construction of an Italian ryegrass-rice rotation (IRR) system, the variety and dynamics of N and P loss in underground leakage water under different experimental treatments were investigated. The average loss of N and P through leakage water in the growth cycle was 115.98 kg/ha NO₃^--N, 0.828 0 kg/ha NH₄⁺-N and 0.028 5 kg/ha P under the idle field treatment (CK). Winter cropping of Italian ryegrass reduced the loss of N and P. Winter cropping Italian ryegrass with 375 kg/hm compound fertilizer, resulted in loss reductions of NO₃^--N, NH₄⁺-N and P of 49.43%, 48.59% and 24.11%, respectively, compared to the CK. Winter cropping Italian ryegrass with 750 kg/ha compound fertilizer, resulted in loss reductions of NO₃^--N and NH₄⁺-N of 38.20% and 15.57%, respectively, while the loss of P was slightly greater than that under CK.

CLC Number:

S543⁺.606

XIN Guo-rong, LI Jian, YANG Zhong-yi. Effect of winter cropping Italian ryegrass on N and P leakage from soils[J]. Acta Prataculturae Sinica, 2011, 20(6): 118-125.

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