According to the result of simulated runoff experiment in laboratory, the effective depth of interaction (EDI) of runoff with soil mineral nitrogen is analyzed and the methods to confirm EDI of fertilization experiments and underutilization ones are proposed. The results are as follows. ①The EDI of runoff with soil NO3--N is deeper than that of soil NH4+-N, the shortfall is (7-15) cm. ②Straw cover can greatly enhance the EDI of soil NO3--N , more cover, deeper the EDI. ③There is no evident influence of one ...
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