不同释放天数包膜控释尿素在春玉米上的应用研究

APPLICATION OF DIFFERENT RELEASE DURATION CONTROLLED-RELEASE COATED UREA ON SPRING MAIZE

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%。

Field experiment was conducted to study the effects of controlled-release coated urea combined with conventional urea on yield, nitrogen use efficiency, total nitrogen accumulation amount and economic benefits in maize. The fertilization treatments were applied at same nitrogen rates, namely ： no nitrogen （ CK1 ）, farmer treatment （ CK2）, 30% of CU30 and 70% of urea applied at pre-plant （CUU1）, 30% of CU60 and 70% of urea applied at pre-plant （CUU2） , and 30% of cug0 and 70% of urea applied at pre-plant （CUU3）. The results showed that CUU2 and CUU3 treatments were better than CK2 treatment, with 840 and 740kg/hm2 of maize grain yield increases, 16.2 and 14. 3kg/ hm2 of total nitrogen accumulations amount increases, 8.8% and 7.7% of nitrogen use efficiency increases, 1651 and 1464yuan/hm2 of value increases, respectively. Comparison with other treatments, the economic benefits of CUU2 treatment was the best, showing 11.1% higher than CK2 treatment.