Journal of Integrative Agriculture ›› 2012, Vol. 12 ›› Issue (12): 1993-2000.DOI: 10.1016/S1671-2927(00)8736
Effects of N Management on Yield and N Uptake of Rice in Central China
PANSheng-gang, HUANG Sheng-qi, ZHAI Jing, WANG Jing-ping, CAO Cou-gui, CAI Ming-li, ZHAN Ming , TANG Xiang-ru
- 1.Key Laboratory of Huazhong Crop Physiology, Ecology and Production, Ministry of Agriculture/College of Plant Science & Technology, Huazhong Agricultural University, Wuhan 430070, P.R.China
2.College of Agriculture, South China Agricultural University, Guangzhou 510642, P.R.China
Effects of N Management on Yield and N Uptake of Rice in Central China
PANSheng-gang , HUANG Sheng-qi, ZHAI Jing, WANG Jing-ping, CAO Cou-gui, CAI Ming-li, ZHAN Ming , TANG Xiang-ru
- 1.Key Laboratory of Huazhong Crop Physiology, Ecology and Production, Ministry of Agriculture/College of Plant Science & Technology, Huazhong Agricultural University, Wuhan 430070, P.R.China
2.College of Agriculture, South China Agricultural University, Guangzhou 510642, P.R.China
摘要： Efficient N fertilizer management is critical for the economic production of rice and the long-term protection of environmental quality. A field experiment was designed to study the effects of N fertilizer management practices on grain yield and N uptake of rice. The experiment was laid out in the randomized complete block design with four replications in Central China during 2008 and 2009. Five N treatments denoted as N0, N150A, N150B, N240A, and N240B, respectively, were studied. N0 represented no N application and served as a control, N150A and N150B indicated the total N application of 150 kg N ha-1 but with two different application schedules (A and B) across the early stage of rice growth. Schedule A was applied as follows: 40% basal, 30% at 10 d after transplanting (DAT) and 30% at 36 DAT (nearly at the panicle initiation stage), while schedule B was as follows: 30% at basal, 20% at 10 DAT, and 50% at 36 DAT. Similarly, N240A and N240B indicated the total N application of 240 kg N ha-1 with schedules A and B as described above. To quantify N uptake from fertilizer and soil, a 15N experiment was also conducted within the main experimental field, with micro-plots. Grain yields were significantly increased as N rates increased from 0 to 240 kg N ha-1. At the same rate, splitting N application as schedule B significantly increased the grain yield, spikelets per panicle, percentage of ripened grain, and 1 000-grain weight, compared with the N application according to schedule A. Mean rice recovery of N fertilizer by 15N tracing method ranged from 25.39% at N240A to 34.89% at N150B, however, N fertilizer residual rate in the soil ranged from 12.40% at N240A to 16.61% at N150B. About 31.5 and 28.5% of total uptake of 15N derived from basal fertilizer was absorbed at panicle initiation and heading stages, respectively. However, 65.6-92.5% of total uptake of 15N derived from topdressing fertilizer was absorbed at the heading stage. Based on yield and nitrogen recovery efficiency, splitting N application according to schedule B at the rate of 240 kg N ha-1 will be more profitable among the tested five N treatments in Central China.