喀斯特山区冬小麦施肥量与产量的关系

Relationship between the amount of fertilizer applied and the winter wheat yield in Kasta mountain area

采用三因素饱和D-最优设计方案，研究黔西县大关镇冬小麦施肥量与产量之间的数量关系。结果表明，小麦产量随有机肥的施用量的增加而增加，呈线性相关关系。在一定的范围内，施用氮肥、磷肥有增产作用，当氮、磷施用量过高时产量下降，氮、磷的施用量与小麦产量呈抛物线关系；施用有机肥和磷肥对小麦产董有显著作用，而氮肥的施用置不宜过多。其适宜的有机肥施用量为600-750kg／667m^2，尿素施用量9～12kg／667m^2，普钙施用量20-42kg／667m^2。

The relationship between the amount of fertilizer applied and the winter wheat yield was researched using saturated D-optimized experimental design for 3 - factor case. The result showed that wheat yield increased with increase of organic fertilizer use amount, they are correlated linearly. The use of reasonable amount of N and P led to increase of wheat yield, while the use of too much N and P apparently resulted in decrease of the yield, the amount of N and P used and the output of winter wheat are in parabola relation. The use of certain amount of organic fertilizer and P had an obviously effect on the wheat yield. N use could not be too much. The appropriate use amount of organic fertilizer, urea and superphosphate was 600-750 kg/667 m^2, 9 -12 kg/667 m^2, and 20-42 kg/667 m^2, respectively.