生物炭结合氮肥减量对玉米产量和氮效率的影响

为明确施用生物炭条件下氮高效品种玉米的氮效率和适宜减氮量,以氮高效品种郑单958(ZD)和氮低效品种先玉508(XY)为试验材料,以氮肥用量为主区、品种为副区开展裂区试验设计.试验主区共设置5个处理:C0,不施生物炭,施纯N 300 kg·hm-2;C1,施生物炭3000 kg·hm-2和纯N 300 kg·hm-2;...

Effects of biochar application combined with nitrogen reduction on yield and nitrogen use efficiency of maize

In order to explore the optimal nitrogen reduction amount and nitrogen use efficiency of N-efficient maize variety, N-efficient maize variety Zhengdan 958 (ZD) and N-inefficient variety Xianyu 508 (XY) were adopted as test materials in the present study. The split zone test design was introduced with nitrogen rate as the main zone and maize variety as the secondary zone. For the main zone, 5 treatments were designed: C0, N rate of 300 kg·hm^-2 without biochar application; C1, N rate of 300 kg·hm^-2 with 3 000 kg·hm^-2 biochar application; C2, N rate of 255 kg·hm^-2 with 3 000 kg·hm^-2 biochar application; C3, N rate of 210 kg·hm^-2 with 3 000 kg·hm^-2 biochar application; C4, N rate of 165 kg·hm^-2 with 3 000 kg·hm^-2 biochar application. It was shown that, judged from nitrogen use efficiency and yield, the proper N rate was 165-210 kg·hm^-2 with biochar application for ZD. In other words, nitrogen reduction potential for ZD was 90-135 kg·hm^-2 under the given condition, and the nitrogen use efficiency could be elevated by 52.8%-93.3% compared with C0 treatment. Besides, the nitrogen accumulation in grains were mainly transferred from root system at anthesis stage under N rate of 165-210 kg·hm^-2 with 3 000 kg·hm^-2 biochar application for ZD. In general, proper nitrogen reduction combined with biochar application could exert the advantages of N-efficient variety in nitrogen uptake and utilization, hence to stabilize maize yield with higher nitrogen reduction rate.