营养型改土剂对土壤理化性质和蓄水量及制种玉米经济效益的影响

在甘肃省酒泉市连作制种玉米8 a的土壤上,采用田间试验方法,研究了营养型改土剂对土壤理化性质和蓄水量及制种玉米经济效益的影响。结果表明： 随着营养型改土剂施用量的增加,土壤孔隙度、团聚体、田间持水量、蓄水量在增加,而土壤容重降低; 营养型改土剂用量与土壤有机质、速效氮磷钾、阳离子交换量(CEC)呈正相关关系,与土壤pH值呈负相关关系; 随着营养型改土剂施用量的增加,制种玉米产量增加,但每公斤营养型改土剂的增产量则随着营养型改土剂施用量的增加而递减。经回归统计分析,营养型改土剂最佳施用量为1 349.96 kg·hm^-2,此施用量下,玉米的理论产量为7 080.00 kg·hm^-2,回归统计分析结果与田间小区试验处理4基本吻合。

Effect of nutrient type soil improvement agents on soil physical and chemical properties and maize economic benefits

The experiments were conducted to study the effects of nutrient type of soil improvement agents on the physical and chemical properties of soil, water storage and economic benefits of maize based on an eight-year maize field in the Jiuquan, Gansu province. The results showed that soil porosity, aggregate structure, field capacity and holding capacity decreased with the increasing of the application amounts of soil improvement agents. The rate of soil improvement agents was positively correlated with organic matter, alkali N, available P, available K and CEC, whereas was negatively correlated with bulk density and pH value. With the increase in soil improvement agents, maize grain yield increased, while the marginal benefit decreased. Regression analysis showed that the best application amount of this nutrient type of soil agents be 1 349.96 kg·hm^-2, resulting in the theoretical yield of maize of 7 080.00 kg·hm^-2.