Taking N, P_2O_5,K_2O, plants per mu and numbers of fruiting branches as variable, adopting quadratic regression revalution disign with five factors, after feilds testing and comutes treatment, the authors established appropriate mathematical model. The factor effects and optimal schemes selected from different grades of yield were analysed. The results showed as follows: (1) The effect of density (plants per mu) and K_2O in the cotton growing areas to yield were remarkable. (2) The optimal plan with≥75kg p...
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