Effect of Different Coated Materials Controlled Release Urea on Maize Yield

In order to extend and apply controlled release urea,the effect of different coated materials controlled release urea on maize yield was conducted in black soil area in the middle of Heilongjiang province.The result showed that the controlled release urea reasonably could increase the maize yield apparently,and the range of increase was 3.23%～8.33%.The yield differences between different coated materials controlled release urea were not significant.