茶陵县早稻“3415”回归设计施肥模型研究

选择茶陵县舲舫乡垸井村和塘冲村两个试验点,应用"3415"(3个肥料要素4个施肥水平15个处理)回归设计进行了两个早稻品种的肥效试验,获得两个肥效函数方程.试验结果表明,早稻的最佳经济用肥量为N 135 kg/hm~2,P_2O_5 72 kg/hm~2,K_2O67.5 kg/hm~2.三要素中N的肥效最大,是制约早稻产量的主要因素,P、K肥效排在其后,P、K肥效排序还受土壤肥力影响.

The Fertilization Model of"3415"Regression Design for Early Rice in Chaling County

The manure trials of two early rice varieties were conducted in Huanjing Village and Tangchong Village of Chaling County separately and two functional equations of fertilizer efficiency were obtained by using"3415"regression design(three fertilizer factors,four fertilization levels and 15 kinds of treatment).The results showed that the optimum economic applying quantity of fertilizer for early rice was as foUows:N 135 kg/hm~2,P2O5 72 kg/hm~2 and K2O 67.5 kg/hm2;the fertilizer efficiency of nitrogen (N) was the largest among the three fertilizer factors,which is the major racer restricting the yield of early rice;the fertilizer efficiency of phosphorus(P)and potassium (K) were lower than that of N,and the order of fertilizer efficiency of P and K was affected by soil fertility.