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通过对释放天数分别为30d、60d、90d的包膜控释尿素(CU)与普通尿素(U)配合一次性基施对春玉米产量、氮肥利用率、氮素累积量及经济效益的影响进行研究,以确定适合吉林省春玉米养分需求的包膜控释尿素。结果表明:在等氮量、控释氮素占总氮量30%的条件下,CU60、CU90与U配合(CUU2,CUU3)一次性基施相对于习惯施肥处理(CK2),玉米产量分别增加840和740kg/hm2,氮素总积累量分别增加16.2和14.3kg/hm2,氮肥利用率分别提高8.8%和7.7%,经济效益分别增加1651和1464元/hm2,其中,CUU2处理春玉米经济效益最好,经济效益提高11.1%。
The effects of one-time basal application of coated controlled-release urea (CU) and common urea (U) on spring maize yield, nitrogen use efficiency, nitrogen accumulation and economic benefits were studied for 30d, 60d and 90d days respectively Study to determine the appropriate nutrient requirements of Jilin Province, the spring maize coated controlled release urea. The results showed that under the conditions of isobaric nitrogen and controlled release nitrogen in 30% of total nitrogen, CU60, CU90 and U combined with CU (CUU2 and CUU3) increased their yields by one time relative to conventional fertilization (CK2) and maize 840 and 740 kg / hm2, respectively. The total nitrogen accumulation increased by 16.2 and 14.3 kg / hm2 respectively, and the nitrogen use efficiency increased by 8.8% and 7.7%, respectively. The economic benefits increased by 1651 and 1464 yuan / hm2, The best, economic benefits increased by 11.1%.