不同施肥条件对杂交谷叶绿素含量的影响

The Influence of Different Fertilization Conditions on Chlorophyll Content of Hybrid Millet

试验研究了施磷量、施氮量和施钾量对谷子叶绿素含量的影响。通过中心复合试验设计,构建了三因素(磷肥、氮肥、钾肥)五水平的响应面设计法,并建立了谷子叶绿素含量的三因子二次回归数学模型。结果表明,氮肥对叶绿素含量有极显著影响(P<0.01),而磷肥、钾肥的施用对杂交谷叶绿素含量没有显著影响(P>0.05),施磷量与施钾量之间存在极显著的交互作用(P<0.01),施氮量与施钾量之间存在显著交互作用(P<0.05),施磷量与施氮量之间的交互作用对杂交谷叶绿素含量影响不显著(P>0.05),施磷量与施氮量、施磷量与施钾量之间存在显著的交互作用(P<0.01),施氮量与施钾量之间的相互作用对谷子产量影响不显著(P>0.05);多元二次回归分析结果显示,施磷量、施氮量、施钾量与杂交谷叶绿素含量之间的回归模型高度显著(P<0.01)。经过统计分析,可以确定谷子的最佳施肥组合为施磷量417kg/hm2、施氮量352.5kg/hm2和施钾量133.5kg/hm2;通过模型推算在此条件下杂交谷叶绿素含量为33.2mg/g。

To obtain optimal cultivation conditions for hybrid millet, an experiment was conducted to explore the effects of phosphate levels, potassium levels and nitrogen levels on grain chlorophyll content of hybrid millet. The response surface methodology was applied to optimize the main cultivation factors including phosphate level, nitrogen level and potassium level, and a quadratic regression equation was established. The results show that the phosphate level and potassium level do not have significant effects on chlorophyll content of hybrid millet （ P 〉 0.05 ）, while nitrogen level has highly significant effects on chlorophyll content of hybrid millet. There are obvious interactions between the phosphate level and potassium level （P 〈 0.01 ）. There are also obvious interactions between the nitrogen level and potassium level （P 〈 0. 01 ）. However,the interaction between the nitrogen level and phosphate level is not significant （P 〉0. 05 ）. The multivariate quadratic regression model of the chlorophyll content of hybrid millet and the phosphate level, nitrogen level and potassium level is highly significant （P 〈 0.01 ）. The optimal cultivation conditions are that the phosphate level is 417kg./hm2, the nitrogen level is 352.5kg/hm2 , and the potassium level is 133.5kg/hm2. Under these conditions, the chlorophyll content of hybrid millet is 33.2mg/g. The research lays a theoretical foundation for spreading hybrid millet to a large area.