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[Effects of nitrapyrin-nitrogen (N) fertilizer application rates on N utilization and N2O emission in summer maize
Shan Shan Wei1, Yan Qun Wang1, Ying Chun Li2
1College of Resources and Environmental Sciences, Agricultural University of Hebei/Hebei Province Key Laboratory for Farmland Eco-Environment, Baoding 071000, Hebei, China.
Abstract:
To reduce the N2O emission from soil and enhance N utilization by crop, a field experiment was carried out to study the effects of nitrapyrin-N fertilizer application rates (0, 180, 270, 360 kg N·hm-2) on soil N2O emission and N apparent loss, grain yield and N utilization of summer maize. Results showed that the soil N2O emission under different N fertilizer treatments mainly occurred in periods from sowing to seedling, and from jointing to tasseling. Soil N2O emission peaks were observed after basal and top dressing events. Maize yield increased with N fertilizer rates but there was no significant difference between 270 and 360 kg N·hm-2, and the net income of these two treatments was 5209 and 5426 yuan·hm-2, respectively. Compared with no N fertilizer treatment, the N uptake in the N fertilizer treatments was increased by 109.6%-134.1%. The treatment of 270 kg N·hm-2 had the highest agronomic N efficiency and N use efficiency, but the N apparent loss was low. The treatment with nitrapyrin-N fertilization rate of 270 kg N·hm-2 appeared to be the optimal rate to obtain high maize yield and N use efficiency, and low soil N2O emission and N apparent loss.
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