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通过田间试验研究了控释包衣尿素在田间的实际溶出过程及其对玉米产量、氮肥利用率的影响。结果表明,控释包衣尿素在田间的实际溶出期限远远高于实验室的测定值,控释包衣尿素处理耕层土壤无机氮动态过程与其溶出特征比较一致;在减少20%氮肥用量并且采用玉米全生育期一次性基施的措施下,控释包衣尿素的玉米产量和吸氮量与常规施肥措施的尿素持平,而氮肥利用率略有提高。
Field trials were conducted to study the actual dissolution process of controlled release coated urea in the field and its effect on corn yield and nitrogen use efficiency. The results showed that the actual dissolution time of controlled release coated urea in the field was much higher than that of the laboratory. The dynamic process of inorganic nitrogen in topsoil with controlled release coated urea was consistent with the dissolution characteristics. Under the measures of one-time basal application of corn during the whole growth period, the urea yield and nitrogen uptake of controlled release coated urea were the same as that of conventional fertilization, while the nitrogen use efficiency slightly increased.