夏玉米干旱综合防御技术试验分析

使用覆盖麦秸、多功能防旱剂拌种以及在夏玉米拔节期、开花期喷多功能防旱剂等干旱综合防御措施，进行田间集成试验。分析试验结果得出：覆盖麦秸可以提高土壤含水量10％～20％，主要集中在0～30cm耕作层，尤以0～10cm保墒效果最好，配合多功能防旱剂的拌种和喷施，可以有效缓解土壤水分的不足，起到合理利用土壤水分，减轻干旱危害的作用，利于夏玉米的生长发育，增强玉米抗倒伏能力，特别在小苗期，这种保墒效果对全苗、壮苗非常重要。一般伏旱年份，采用综合防旱技术，可以提高夏玉米产量10％以上，净收益达到500元／hm^2以上，而且该项技术操作简便，易于推广。

Analysis of Experiment of Integrated Drought-preventing Techniques for Summer Maize

The field experiment of the integrated drought-preventing techniques such as wheat straw mulching, spraying drought preventing agent and wrapping seed before planting, were conducted from June to September 2002 The results show that the soil water content increased by 10%-20% in 0-30cm soil layer, the drought harm was reduced, and growth of summer maize in experiment field was better than that in farmland The summer maize yields increased by over 10% and benifit added over 500 yuan/hm 2 with the application of the integrated drought preventing techniques.