| This article has been：Browse 98Times Download 121Times |
scan it! |
|
|
| DOI：10.13522/j.cnki.ggps.2022480 |
|
| Effects of Nitrogen Management on Rice Yield and Nitrogen Fertilizer Utilization Rate under Drip Irrigation in Hexi Oasis Irrigation Area |
|
TANG Wenxue, MA Zhongming, CHEN Juan, LUO Shuanglong
|
|
1. Institute of Soil, Fertilizer and Water-saving Agriculture, Gansu Academy of Agricultural Sciences, Lanzhou 730070, China;
2. Gansu Academy of Agricultural Sciences, Lanzhou 730070, China;
3. Institute of Economic Crops and Malting Barley Material, Gansu Academy of Agricultural Sciences, Lanzhou 730070, China
|
| Abstract: |
| 【Objective】To explore the effect of the optimal nitrogen application rate and nitrogen management on nitrogen fertilizer utilization and rice yield under drip irrigation.【Method】Five nitrogen application levels and three nitrogen fertilizer planning and management methods were set for field trials at the Zhangye Water-saving Agricultural Experimental Station of the Hexi Oasis Irrigation Area, aiming to study the effects of different nitrogen application rates and nitrogen fertilizer planning and management methods on rice growth, yield, and nitrogen fertilizer utilization rate under drip irrigation.【Result】Nitrogen rate had a significant impact on rice yield components such as effective panicle number, grain number per panicle, ripening rate, and 1000-grain weight, and can significantly improve rice yield under drip irrigation. Compared with N0 treatment, N1, N2, N3, and N4 treatments significantly increased rice yield by 33.50%, 45.60%, 39.20%, and 30.63%, respectively, with significant differences between the nitrogen treatments. Rice yield was highest (5 622.8 kg/hm2) when the nitrogen application rate was 225 kg/hm2. Nitrogen fertilizer planning and management methods can significantly affect the effective panicle number of rice. Among the three planning and management methods, N2B contributed the highest yield. The effective panicle number of rice can be significantly increased by the appropriate rear shift of nitrogen fertilizer, resulting in a high rice yield. The utilization rate of nitrogen fertilizer was significantly and negatively correlated with the nitrogen application rate. When the nitrogen application rate was 225 kg/hm2, the nitrogen uptake and utilization indicators in rice were significantly lower than those of N1 treatment but significantly higher than those of N3 and N4 treatments. Meanwhile, the addition of rice panicle fertilizer and grain fertilizer can significantly improve the absorption and utilization rate of nitrogen fertilizer and the agronomic utilization efficiency of nitrogen fertilizer. 【Conclusion】 It was proposed through comprehensive analysis that the Hexi Oasis Irrigation Area will see high rice yield and appropriate nitrogen fertilizer application rate, as well as planning and management method for efficient utilization when the nitrogen application rate is 225 kg/hm2 and the input percentage of basal fertilizer, tiller fertilizer, panicle fertilizer, and grain fertilizer are 15%∶30%∶ 40%∶15%. |
| Key words: drip irrigation with plastic film mulching; rice; yield; yield construction; nitrogen use efficiency; nitrogen management |
|
|
