Two factors including nitrogen and soil moisture before planting were selected to deckion, optimum design and Logistic equation[y=yo/( 1+e ̄(A+Bt))]was used to describe the weight in- creasqing process of the grain for different treatments,several parameters of grain filling process were derived from this equation.The mathematical function of grain filling rates and duration of wheat has been established.The results showed that the initial growth potential of fertilized ovary(Co)of the wheat grown in soil...
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