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Chinese Journal of Applied Ecology ›› 2018, Vol. 29 ›› Issue (1): 133-140.doi: 10.13287/j.1001-9332.201801.023

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Effects of loss-controlled urea on ammonia volatilization, N translocation and utilization efficiency in paddy rice.

XUE Xin-xin, WU Xiao-ping, ZHANG Yong-fa, LUO Xue-hua, ZOU Bi-xia, WANG Da-peng, WANG Wen-bin*   

  1. Rubber Research Institute/Soil and Fertilizer Center, Chinese Academy of Tropical Agriculture Science, Danzhou 571737, Hainan, China
  • Received:2017-02-17 Online:2018-01-18 Published:2018-01-18
  • Contact: * E-mail: mywwb@163.com
  • Supported by:
    This work was supported by the Open Fund for discipline group of Plant Nutrition and Fertilizer Science, Ministry of Agriculture, China (APF2015038).

Abstract: With the common urea split application (CU) as the control, a field experiment was conducted to examine the effects of loss-controlled urea by split application (LCUS) and loss-controlled urea by basal application (LCUB) on ammonia volatilization (NH3), nitrogen (N) nutrition status, grain yield and N utilization efficiency in rice plants. The results showed that the ratio of NH3 volatilization loss to total N application were 15.8%, 13.4% and 19.7% under the conditions of CU, LCUS and LCUB treatments, respectively. Compared to CU, LCUS significantly reduced the NH3 emission by 4.4 kg N·hm-2, with a decrease of 18.0%, while the LCUB significantly increased the NH3 emission by 7.2 kg N·hm-2, which increased by 24.7%. Compared to CU, LCUS increased the chlorophyll contents of leaf, the N content and N accumulation of seed and straw and grain yield, and significantly increased the N recovery efficiency by 7.6%, while significantly reduced the amount of N translocation, apparent N translocation rate and the rate of contribution to N in spike, respectively. However, compared to CU, LCUB significantly reduced the chlorophyll contents of leaf, the N content and accumulation of seed and straw as well as N utilization efficiency, but the grain yield, the amount of N translocation, apparent N translocation rate and the rate of contribution to N in spike were not affected. In conclusion, LCUS could maintain stable production, as well as decrease NH3 emission, improve N nutrition status and increase N utilization efficiency in rice plants.