几种新型包被尿素在淮北砂姜黑土区的肥效研究

通过新型尿素和普通尿素在小麦、玉米上各2年的田间试验，结果表明，作为基肥一次施用，新型尿素不但增加了作物产量，而且肥料利用率也有所提高。在小麦上增产9．55％，氮素利用率提高1．6％－12．6％；在玉米上增产18．75％ ，氮素利用率提高4．1％－16．4％，经济效益比较明显。初步表现出具有肥效长和肥料利用率高等特点，有较明显的增产增收的效果。

Study on Fertilizer Efficiency of Several New Types Urea in Huaibei Vertisol.

By way of field experiments of new types urea and ordinary urea on wheat and maize two years respectively, obtained a result:new type urea of applying as base fertilizer were able to improve not only crop yield, but also fertilizer utilization efficiency. On wheat and maize, they increased yield 9.55% and 18.75% respectively, improved fertilizer utiolization efficiency 1.6%-12.6% and 4.1%-16.4% respectively. Economic benefits showed a marked increase. They displayed preliminarily a characteristic of long fertilizer efficiency and a good effect of increasing crop yield.