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采用二次饱和D—最优设计 ,在粘质潮土上进行田间试验 .结果表明 ,棉花 4个产量性状和籽棉产量与氮磷化肥用量之间均可用二元二次回归方程描述 ,并达极显著水平 .经计算 ,要获得籽棉 2 50kg/亩的目标产量 ,应施N 1 2 2～ 9 1 1kg/亩和P2 O56 0 9～ 1 1 5kg/亩 .
Field experiments were conducted on clayey tidal soil using the second-order saturation D-optimal design.The results show that the four quadratic regression equations can be used to describe the four yield traits and the seed cotton yield and the amount of nitrogen and phosphorus fertilizer It is calculated that to obtain the target output of 250kg / mu seed cotton, N 1 2 2 ~ 9 1 1kg / mu and P2 056 ~ 915 1kg / mu should be applied.