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| Dynamic changes in carbon and nitrogen pool management indexes in super rice fields treated with various organic materials and equal nutrients |
| Received:December 08, 2022 Revised:February 27, 2023 |
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| KeyWord:equal nutrient input;super-hybrid rice;rice straw and Chinese milk vetch return to the field jointly;different growth periods;carbon pool management index;nitrogen pool management index |
| Author Name | Affiliation | E-mail | | WANG Kaiyue | Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences/Agricultural and Rural Carbon Peak and Carbon Neutral Research Center/Key Laboratory for Agro-Environment, Ministry of Agriculture and Rural Affairs, Beijing 100081, China | | | LIAO Yulin | Soils and Fertilizer Institute of Hunan Province, Changsha 410125, China | | | LU Yanhong | Soils and Fertilizer Institute of Hunan Province, Changsha 410125, China | | | CAI Andong | Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences/Agricultural and Rural Carbon Peak and Carbon Neutral Research Center/Key Laboratory for Agro-Environment, Ministry of Agriculture and Rural Affairs, Beijing 100081, China | | | ZHANG Zhiwei | Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences/Agricultural and Rural Carbon Peak and Carbon Neutral Research Center/Key Laboratory for Agro-Environment, Ministry of Agriculture and Rural Affairs, Beijing 100081, China
School of Environmental Science and Engineering, Nanjing University of Information Science and Technology, Nanjing 210044, China | | | CHEN Xuan | Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences/Agricultural and Rural Carbon Peak and Carbon Neutral Research Center/Key Laboratory for Agro-Environment, Ministry of Agriculture and Rural Affairs, Beijing 100081, China | | | QIN Xiaobo | Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences/Agricultural and Rural Carbon Peak and Carbon Neutral Research Center/Key Laboratory for Agro-Environment, Ministry of Agriculture and Rural Affairs, Beijing 100081, China | qinxiaobo@caas.cn |
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| Abstract: |
| To compare the effects of various organic materials returned to paddy fields on soil carbon and nitrogen pool management indexes under equal nutrient conditions, the dynamic changes of carbon and nitrogen pool management indexes at different growth stages of rice and their relationships with yield and harvest index were assessed. Thus, a scientific basis was provided for straw resource utilization and soil carbon and nitrogen pool expansion in paddy fields. The field experiment was conducted in Changsha, Hunan Province, and the super-hybrid rice planting system was selected as the research object. Five equal nutrient inputs were used:single application of fertilizer (F), fertilizer+total rice straw returning(FS), fertilizer+total Chinese milk vetch returning(FM), fertilizer+total Chinese milk vetch returning+total rice straw(FMS), and fertilizer+total Chinese milk vetch returning+total rice straw+slaked lime(FMS+Ca). Soil samples were collected at five growth stages(transplanting stage, tillering stage, booting stage, filling stage, and maturity stage)to determine the concentrations of soil organic carbon(SOC), soluble organic carbon(DOC), total nitrogen(TN), and soluble total nitrogen(TDN) and to calculate the carbon pool management index(CPMI) and nitrogen pool management index(NPMI). The following results were obtained:the overall dynamic change trend of CPMI under different treatments showed that the transplanting stage decreased and then slowly increased. The CPMIs of the FMS(87.18) and FMS+Ca(80.59)treatments were significantly higher than that of the F(62.35) and FS (62.46)treatments(P＜0.05). NPMI showed two sharp declines during the growth period, and at the end of the growth period, the NPMI of the FMS+Ca treatment(57.85)was significantly higher than that of the F(54.64) and FS(42.70)treatments(P＜0.05). Compared with F treatment, organic and inorganic treatments(FS, FM, and FMS)increased the crop yield by 2.19% to 2.94%; CPMI at the grain filling stage was positively correlated with the yield and harvest index. The following conclusions were reached:the soil carbon and nitrogen pool of paddy field could be expanded on the basis of maintaining constant yield. Chinese-milk vetch-rice straw combined with returning to the field had the best comprehensive effect on enhancing CPMI and NPMI of rice at different growth stages. |
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