不同土壤水分条件下尿素类型对夏玉米营养品质的影响

为了进一步探讨夏玉米品质性状的水氮调控效应，以郑单958为供试材料，于2012—2013年2个生长季在山东省微山县农业局实验站防雨棚中进行了池栽试验。研究了不同土壤水分条件下普通尿素和包膜复合肥对夏玉米籽粒品质性状的影响。试验结果表明，同一土壤水分条件下，包膜复合肥处理的夏玉米籽粒蛋白质含量和产量、粗脂肪含量和淀粉含量均显著高于不施氮处理和普通尿素处理（基施+小喇叭口期追施）。同一氮肥处理，维持土壤田间最大持水量75％时，夏玉米籽粒蛋白质产量、粗脂肪含量和淀粉含量均显著高于维持土壤田间最大持水量50％；而籽粒蛋白质含量却显著降低，但包膜复合肥处理仍高于普通尿素处理。因此，与普通尿素相比，不论在干旱或土壤水分适宜时，包膜复合肥均能明显提高籽粒蛋白质含量、粗脂肪含量和淀粉含量，改善夏玉米籽粒的营养品质。 

Effects of Urea Types on Quality Traits of Summer Maize in Different Soil Water Conditions

To evaluate the effects of water and nitrogen and their interactions on quality traits in grains of summer maize，pool cultivation experiments was carried out in anti canopy of test station for Agricultural Bureau of Weishan County in Shandong province in 2 growth seasons between 2012 and 2013,and cultivar Zhengdan 958 was the tested materials.Effects between normal urea（NU）and coated compound fertilizer（CCF）on quality traits of summer maize in different soil water conditions were researched.Test results showed that at the same soil water condition，protein yield and content of protein，content of crud fat and starch of CCF treatments were significantly higher than those of NU treatment and control.In the same nitrogen fertilizer treatment，protein yield，content of crud fat and starch of soil moisture at 75% of field capacity were higher than those of soil moisture at 50% of field capacity，and protein content was reduced，but protein content of CCF treatments was significantly higher than that of NU treatments.In conclusion，whatever under dry or wet soil，the positive coupling effect of CCF on content of protein，crud fat and starch was higher than that of NU，which could improve grain quality of summer maize very significantly.