• 研究报告 •

### 施氮量和每穴苗数对双季杂交早稻产量及氮肥利用率的影响

1. (1江西农业大学双季稻现代化生产协同创新中心/作物生理生态与遗传育种教育部重点实验室/江西省作物生理生态与遗传育种重点实验室， 南昌 330045；2江西省农业气象中心， 南昌 330045；3江西省红壤研究所， 南昌 331717)
• 出版日期:2018-10-10 发布日期:2018-10-10

### Effects of nitrogen application rate and seedlings per hole on yield and nitrogen use efficiency of double-season early hybrid rice.

DUAN Li-cheng1,2, LV Wei-sheng1,3, FANG Jia-hai1, ZENG Yong-jun1, SHI Qing-hua1, PAN Xiao-hua1, CAI Hai-sheng1, WU Zi-ming1*

1. (1Collaborative Innovation Center for the Modernization Production of Double Cropping Rice/Key Laboratory of Crop Physiology, Ecology and Genetic Breeding, Ministry of Education/Jiangxi Key Laboratory of Crop Physiology, Ecology and Genetic Breeding, Jiangxi Agricultural University, Nanchang 330045, China; 2Jiangxi Agricultural Meteorological Center, Nanchang 330045, China; 3Jiangxi Institute of Red Soil, Nanchang 331717, China).
• Online:2018-10-10 Published:2018-10-10

Abstract: To provide theoretical basis for high yield and benefit of doubleseason early hybrid rice, we examined the effects of nitrogen (N) application rate and the number of transplanting seedlings per hole on the yield, yield components, and nitrogen use efficiency of doubleseason early hybrid rice. The experiment used a completely randomized block design, including five N application levels (0, 120, 150, 180 and 210 kg·hm-2, expressed as N0, N1, N2, N3 and N4 respectively) and three levels of seedlings per hole (2, 3 and 4 seedlings per hole, expressed as M1, M2 and M3 respectively). We investigated the dry matter, leaf area index, grain yield and its components, N uptake, N use efficiency in the mature period of rice. The results showed that both N application rate and seedlings per hole had significant effects on doubleseason early rice yield. Rice yield had a significantly positive correlation with panicle number and grain number per spike, and a significantly negative correlation with seed setting rate and 1000-grain weight. With the increases of N application rate, total N accumulation in rice increased, but the N agronomic efficiency, N partial factor productivity, N internal efficiency and N harvest index decreased. The absorption and utilization efficiency of N fertilizer and yield increased at first and decreased later with the increases of N application rate. With the increases of seedlings per hole, the agronomic efficiency of N decreased. A proper amount of seedlings could increase the total dry matter and yield to improve the N use efficiency. Compared with other treatments, the combination of 180 kg·hm-2 of N application rate and 3-4 seedlings of per hole could get higher yield and N use efficiency. Suitable amount of N application and seedlings per hole could produce a significant increase in effective panicle number, yield and total N accumulation. Nitrogen fertilization rate was recommended as 180 kg·hm-2 for the early rice with the transplanting density of 3-4 seedlings per hole.