渭北旱塬油葵高产优化数学模型研究

Study on Optimization Mathematical Model of Agronomic Measures for High Yield of Sunflower on Weibei Rainfed Highland

选取对油葵产量影响较大的施Ｎ量、施Ｐ量和密度等因子，采用三元二次回归正交旋转组合设计，研究了渭北旱塬油葵高产优化数学模型。结果表明，在该区域影响油葵产量的各因素依次为：施Ｐ量＞施Ｎ量＞密度；在产量＞３０００ｋｇ／ｈｍ２时，该区油葵高产最优农艺方案为：密度４５０００～４９４８５株／ｈｍ２，施纯Ｎ７５．００～１００．９５ｋｇ／ｈｍ２，Ｐ２Ｏ５６９．０～８２．５ｋｇ／ｈｍ２（Ｎ、Ｐ比１．１∶１～１．２∶１）。

Based on the previous experimental research,such agronomic measures as the amounts of N fertilizer,P fertilizer and sowing density were used to study the mathematical model of high yielding and optimization cultivation of sunflower by means of Quintic quidric regression design.The results showed that the sequences of each factor affecting sunflower yield were amount of P fertilizer applied > amount of N fertilizer applied>density.When the yield of sunflower exceeds 300 kg/hm 2,it is recommended to be an optimization agronomic programme that 75～100.95 kg/hm 2 pure N fertilizer,69～82.5 kg/hm 2 pure P 2O 5 fertilizer,45 000～49 485 plants/hm 2 in density and N∶P 2O 5=1.1∶1～1.2∶1 are taken.