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Optimizing Nitrogen Application for Chinese Ratoon Rice Based on Yield and Reactive Nitrogen Loss

Author

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  • Ren Hu

    (College of Agriculture, Yangtze University, Jingzhou 434025, China
    Engineering Research Center of Ecology and Agricultural Use of Wet Land, Ministry of Education, Jingzhou 434025, China)

  • Zijuan Ding

    (College of Agriculture, Yangtze University, Jingzhou 434025, China
    Engineering Research Center of Ecology and Agricultural Use of Wet Land, Ministry of Education, Jingzhou 434025, China)

  • Tingyu Li

    (College of Tropical Crops, Hainan University, Haikou 570228, China)

  • Dingyue Zhang

    (Jiangsu Institute of Agricultural Sciences in Coastal Region, Yancheng 224002, China)

  • Yingbing Tian

    (College of Agriculture, Yangtze University, Jingzhou 434025, China
    Engineering Research Center of Ecology and Agricultural Use of Wet Land, Ministry of Education, Jingzhou 434025, China)

  • Yuxian Cao

    (College of Life Science, Yangtze University, Jingzhou 434025, China)

  • Jun Hou

    (College of Agriculture, Yangtze University, Jingzhou 434025, China
    Engineering Research Center of Ecology and Agricultural Use of Wet Land, Ministry of Education, Jingzhou 434025, China)

Abstract

Ratoon rice (RR) has been regarded as a labor-saving and beneficial production system. Nitrogen (N) surplus and reactive N losses (Nr losses) are effective environmental indicators used to evaluate the performance of N management. Few studies have assessed N surplus and Nr losses for Chinese RR. In this study, Chinese RR planting areas were divided into South China (SC), the southern part of East China (SEC), Central China (CC), the northern part of East China (NEC), and Southwest China (SW). N surplus and Nr losses were also calculated based on 782 studies using a quadratic model under optimized N management for the highest yield (OPT-yield), the highest N-use efficiency (NUE) (OPT-NUE), and the highest grain N uptake (OPT-N uptake). The RR yields in the five regions ranged from 9.98 to 13.59 t ha −1 . The high-yield record was observed in SEC, while the low-yield record was observed in NEC. The highest and the lowest Nr losses were found in NEC and SC, respectively. N surplus was reduced, while the yield was maintained in SEC, CC, NEC, and SW under OPT-yield and OPT-N uptake, and N surplus and Nr losses were reduced in the five regions when targeting the highest NUE. Farmers should be encouraged to plant RR in SEC and CC. RR was also a good choice when N management measures were conducted in three other regions. To achieve a win–win situation for both yield and the environment, OPT-yield could serve to improve the N management of current conventional practices.

Suggested Citation

  • Ren Hu & Zijuan Ding & Tingyu Li & Dingyue Zhang & Yingbing Tian & Yuxian Cao & Jun Hou, 2022. "Optimizing Nitrogen Application for Chinese Ratoon Rice Based on Yield and Reactive Nitrogen Loss," Agriculture, MDPI, vol. 12(7), pages 1-14, July.
    • Handle: RePEc:gam:jagris:v:12:y:2022:i:7:p:1064-:d:867559
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    References listed on IDEAS

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    1. Zhenling Cui & Hongyan Zhang & Xinping Chen & Chaochun Zhang & Wenqi Ma & Chengdong Huang & Weifeng Zhang & Guohua Mi & Yuxin Miao & Xiaolin Li & Qiang Gao & Jianchang Yang & Zhaohui Wang & Youliang Y, 2018. "Pursuing sustainable productivity with millions of smallholder farmers," Nature, Nature, vol. 555(7696), pages 363-366, March.
    2. Evans Asenso & Luyong Zhang & Lingmao Tang & Fuseini Issaka & Kai Tian & Jiuhao Li & Lian Hu, 2019. "Moldboard Plowing with Direct Seeding Improves Soil Properties and Sustainable Productivity in Ratoon Rice Farmland in Southern China," Sustainability, MDPI, vol. 11(22), pages 1-12, November.
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