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Response of soil physicochemical properties, soil nutrients, enzyme activity and rice yield to rice straw returning in highly saline-alkali paddy soils

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Abstract

This study investigated the effect of rice straw returning on the soil physicochemical properties, nutrients, enzyme activity, and rice yield in highly saline-alkali paddy soils using a two-year field experiment conducted in a saline area, Northeast China. The soil was incorporated with rice straw with 0% straw returning (CK), 25% straw returning (25% SR), 50% straw returning (50% SR), 75% straw returning (75% SR) and 100% straw returning (100% SR). Results revealed that compared with CK, the soil bulk density (BD) was significantly decreased after rice straw returning, while it significantly increased the saturated hydraulic conductivity (Ks) and total porosity (TP), thus helpful for the leaching of sodium ions from the soil profile and for root growth. Rice straw returning significantly reduced the soil exchangeable sodium percentage (ESP), saturated paste extract (ECe), sodium adsorption ratio (SAR), pH, Na+/K+ and Na+/Ca2+ ratios, and increased cation exchange capacity (CEC) compared with CK. Rice straw returning significantly increased the availability of soil total N, alkali-hydrolysable N, NH4-N, NO3-N, available P, available K, soil organic matter (SOM), and enzyme activities of highly saline-alkali paddy soils. The grain yield of 25% SR, 50% SR, 75% SR, and 100% SR were 16.92%, 33.10%, 63.87%, and 51.82% higher, respectively, than that of CK, and rice yield reached the highest under 75% SR treatment in 2 years. Grain yield (GY) was positively correlated with soil TP, Ks, CEC, soil nutrients, SOM, and soil enzyme activities. Rice straw returning, especially 75% SR, had the potential to increase rice yield and can be widely applied as an effective means to improve highly saline-alkali paddy soils. These findings improve our understanding of the effect of rice straw returning on ameliorating the health parameters of saline-alkali paddy soils, regulating rice saline-alkali tolerance, and enhancing rice production in saline-alkali paddy areas.

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Funding

This study was funded by the National Natural Science Foundation of China (No. 32071951), Natural Science Foundation of Jilin Province (No. 20230101258JC) and Chinese Scholarship Council (No. 202008220050).

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Correspondence to Feng Jin.

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Che, W., Piao, J., Gao, Q. et al. Response of soil physicochemical properties, soil nutrients, enzyme activity and rice yield to rice straw returning in highly saline-alkali paddy soils. J Soil Sci Plant Nutr 23, 4396–4411 (2023). https://doi.org/10.1007/s42729-023-01358-5

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  • DOI: https://doi.org/10.1007/s42729-023-01358-5

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