Effect of Controlled-release Urea Combined with Common Urea on the Grain Yields of Summer Maize and Distribution of Soil Ammonium and Nitrate Content
Field experiment were carried out on grain yield of summer maize to determine the effect of different proportions of water-base controlled-release coated urea of 60 d release duration combined with conventional urea as topdressing on nitrogen utilization, nitrogen agronomic efficiency, nitrogen partial productivity, nitrogen harvest index and nitrogen accumulation. Dynamic distribution of nitrate content in soil was also studied. The findings indicated that the treatment of controlled-release urea combined with conventional urea (CRUCU)was remarkably higher than the ones used urea alone in various degree in maize yield, fertilizer utilization, nitrogen agronomic efficiency, productivity and nitrogen partial nitrogen harvest index, and the treatment used 50% controlled-release coated urea was superior to other ones. Its yield was increased by 9. 43% than the treatment used urea alone, while nitrogen utilization was 24. 69%. Both differences reached significant level. The nitrate nitrogen content of treatment of CRUCU was sufficient in 0 - 60 cm depth in soil layer throughout the later growth stage of maize, which accorded with demand of maize growth. The treatments of CRUCU with higher amount of controlled-released coated urea had a higher ammonium nitrogen content compared with what used urea alone, but the difference of CRUCU was not obvious. Under the experimental condition in this paper, the treatment with 50% controlled-release coated urea outperformed obviously the summer maize production in the region.
grain yield of summer maizecontrolled-release coated ureanitrogen utilization efficiencynitrateammonium
国家科技期刊平台
NSTL
万方数据
维普
