Journal of Integrative Agriculture ›› 2023, Vol. 22 ›› Issue (9): 2848-2864.DOI: 10.1016/j.jia.2022.12.006

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  • 收稿日期:2022-09-28 接受日期:2022-10-29 出版日期:2023-09-20 发布日期:2023-09-14

Carbon sequestration rate, nitrogen use efficiency and rice yield responses to long-term substitution of chemical fertilizer by organic manure in a rice–rice cropping system

Nafiu Garba HAYATU1, 2, 3*, LIU Yi-ren2*, HAN Tian-fu1, Nano Alemu DABA1, ZHANG Lu1, SHEN Zhe1, LI Ji-wen1, Haliru MUAZU3, Sobhi Faid LAMLOM4, ZHANG Hui-min1#   

  1. 1 National Engineering Laboratory for Improving Quality of Arable Land/Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, P.R.China

    2 Soil and Fertilizer & Resource and Environment Institute, Jiangxi Academy of Agricultural Sciences, Nanchang 330200, P.R.China

    3 Department of Soil Science and Agricultural Engineering, Faculty of Agriculture, Usmanu Danfodiyo University, Sokoto 2346, Nigeria

    4 Plant Production Department, Faculty of Agriculture Saba Basha, Alexandria University, Alexandria 21531, Egypt

  • Received:2022-09-28 Accepted:2022-10-29 Online:2023-09-20 Published:2023-09-14
  • About author:Nafiu Garba HAYATU, E-mail: nafiu.hayatu@udusok.edu.ng; LIU Yi-ren, E-mail: jxnclyr@163.com; #Correspondence ZHANG Hui-min, E-mail: zhanghuimin@caas.cn * These authors contributed equally to this study.
  • Supported by:

    This study was supported by the National Natural Science Foundation of China (41671301), the National Key Research and Development Program of China (2016YFD0300901), and the Central Public-interest Scientific Institution Basal Research Fund (GY2022-13-5; G2022-02-2; G2022-02-3 and G2022-02-10).

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Abstract:

Combined application of chemical fertilizers with organic amendments was recommended as a strategy for improving yield, soil carbon storage, and nutrient use efficiency.  However, how the long-term substitution of chemical fertilizer with organic manure affects rice yield, carbon sequestration rate (CSR), and nitrogen use efficiency (NUE) while ensuring environmental safety remains unclear.  This study assessed the long-term effect of substituting chemical fertilizer with organic manure on rice yield, CSR, and NUE.  It also determined the optimum substitution ratio in the acidic soil of southern China.  The treatments were: (i) NPK0, unfertilized control; (ii) NPK1, 100% chemical nitrogen, phosphorus, and potassium fertilizer; (iii) NPKM1, 70% chemical NPK fertilizer and 30% organic manure; (iv) NPKM2, 50% chemical NPK fertilizer and 50% organic manure; and (v) NPKM3, 30% chemical NPK fertilizer and 70% organic manure.  Milk vetch and pig manure were sources of manure for early and late rice seasons, respectively.  The result showed that SOC content was higher in NPKM1, NPKM2, and NPKM3 treatments than in NPK0 and NPK1 treatments.  The carbon sequestration rate increased by 140, 160, and 280% under NPKM1, NPKM2, and NPKM3 treatments, respectively, compared to NPK1 treatment.  Grain yield was 86.1, 93.1, 93.6, and 96.5% higher under NPK1, NPKM1, NPKM2, and NPKM3 treatments, respectively, compared to NPK0 treatment.  The NUE in NPKM1, NPKM2, and NPKM3 treatments was higher as compared to NPK1 treatment for both rice seasons.  Redundancy analysis revealed close positive relationships of CSR with C input, total N, soil C:N ratio, catalase, and humic acids, whereas NUE was closely related to grain yield, grain N content, and phenol oxidase.  Furthermore, CSR and NUE negatively correlated with humin acid and soil C:P and N:P ratios.  The technique for order of preference by similarity to ideal solution (TOPSIS) showed that NPKM3 treatment was the optimum strategy for improving CSR and NUE.  Therefore, substituting 70% of chemical fertilizer with organic manure could be the best management option for increasing CSR and NUE in the paddy fields of southern China

Key words: carbon sequestration ,  chemical fertilizer ,  long term ,  organic manure ,  nitrogen use efficiency ,  paddy rice