腐殖酸长效尿素在土壤中转化及其对玉米增产的效应研究

Transformation of long-lasting UHA in soil and its effect on maize yield

试验研究腐殖酸长效尿素(Ⅰ、Ⅱ)在土壤中转化及其对玉米增产效应结果表明,与普通尿素相比,施用腐殖酸长效尿素玉米生长发育前期可抑制土壤中脲酶活性,向土壤环境供N速度基本与玉米生长发育需N速度相一致。同时可提高玉米不同生育期叶片叶绿素含量和光合作用强度,显著提高玉米籽粒产量。其中以Ⅰ型长效尿素效果最佳,比普通尿素处理增产35.1%。

The transformation of two types of long-lasting urea in soil and its effect on maize yield were studied. The resuits show that the application of UHA can inhibit the activity of urease in soil in the first period of maize development and its rate of nitrogen yield is constant with that of nitrogen need of maize. The application of UHA can increase the chlorophyll and photosynthesis intensity of maize , consequently increasing the crop yield, among which UHA Ⅰ is the best. Application of UHA Ⅰ can increase the maize yield by 35.1% compared to urea.