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Chinese Journal of Applied Ecology ›› 2021, Vol. 32 ›› Issue (3): 931-941.doi: 10.13287/j.1001-9332.202103.021

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Effects of basic application of chlorocholine chloride combined with nitrogen fertilizer on nitrogen use of summer maize in North China Plain

MA Zheng-bo, DONG Xue-rui, FANG Meng-ying, WANG Qi, YAN Peng, WANG Qing-yan, LU Lin, DONG Zhi-qiang*   

  1. Institute of Crop Sciences, Chinese Academy of Agricultural Sciences/Key Laboratory of Crop Ecology and Cultivation, Ministry of Agriculture and Rural Affairs, Beijing 100081, China
  • Received:2020-08-05 Accepted:2020-11-22 Online:2021-03-15 Published:2021-09-15
  • Contact: * E-mail: dongzhiqiang@caas.cn
  • Supported by:
    National Key Research and Development Program of China (2018YFD0200608) and the Horizontal Cooperation Project (2019110001000850)

Abstract: To clarify the effects of combined applications of chlorocholine chloride (CCC) and nitrogen fertilizer (CN) on nitrogen metabolism and nitrogen use efficiency of summer maize, we conducted a field experiment in Xinxiang experimental station of Chinese Academy of Agricultural Sciences in 2018 and 2019, with four nitrogen application rates (0, 62.5, 125 and 187.5 kg·hm-2), and two maize varieties of Jingnongke 728 (JNK728) and Zhongdan 909 (ZD909). The results showed that across the two years CN-CCC increased maize yield by 7.7% and 5.0% under the nitrogen application rates of 62.5 kg·hm-2 and 125 kg·hm-2, respectively. CN-CCC increased the contents of nitrate reductase, glutamine synthetase, glutamate synthetase and soluble protein, and finally promoted nitrogen metabolism. Under the low and middle nitrogen application conditions (62.5 kg·hm-2 and 125 kg·hm-2), plant nitrogen content of JNK728 and ZD909 increased by 17.6% and 30.3%, grain nitrogen content increased by 10.3% and 17.4%, nitrogen partial productivity, agronomic efficiency of applied nitrogen, recovery efficiency of applied nitrogen, nitrogen use efficiency increased by 10.0%, 15.7%, 23.3%, 24.8% and 5.7%, 15.0%, 49.9%, 71.7%, respectively. In conclusion, appropriate basic application of CN-CCC could enhance nitrogen metabolism, increase nitrogen use efficiency and grain yield of summer maize. Our results showed that CCC combined basic nitrogen application of 125 kg·hm-2 had the best effect.

Key words: chlorocholine chloride, nitrogen fertilizer, summer maize, nitrogen use efficiency