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

The transformation of two types of long-lasting urea in soil and its effect on maize yield were studied.The results 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 Ⅰcan increase the maize yield by 35.1% compared to urea.