Field plastic-mulched wheat trials were conducted by using the regression design of orthogonal rotation in terrane land in Yanan City.By means of establishing mathematical models,this paper analysed inter-reaction between wheat yield and the fertilizer input rate (including:N,P 2O 5,manure).The analysis shows that N rate is more effective than that of P 2O 5 and M,that is three times of the latter two factors.In order to guide the plantation of wheat,the paper also recommended the input rate of the thre...
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