Organic Matter Compensation Scheme and Preliminary Mechanism for Remediation of Soil Productivity Decline in Continuous Cropping Garlic

1.College of Forestry, Nanjing Forestry University;2.Institute of Soil Science, Chinese Academy of Sciences;3.Shandong Jining Academy of Agricultural Sciences, Jining;4.Science and Technology Bureau of Jinxiang County, Shandong Province (Garlic Research Institute), Jining

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Supported by 2022 Carbon Peak Carbon Neutral Technology Innovation Project of Jiangsu Province, China (No. BE2022805) and the 14th Five-year Plan Innovation Program of the Institute of Soil Science, Chinese Academy of Sciences (No. ISSASIP2201)

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    【Objective】This study aimed to use different proportions of organic fertilizer instead of chemical fertilizer as organic matter compensation schemes to study their effects on garlic yield attenuation in long-term continuous cropping garlic fields in the main garlic-producing area of Jinxiang County, Shandong Province. 【Method】The representative fields with more than 25 years of continuous cropping history were selected in this experiment. The wheat field without garlic planting was used as the non-continuous cropping field control. Four treatments were set up : conventional chemical fertilizer fertilization ( CF ) and organic fertilizer to replace chemical fertilizer with 25% ( M25 ), 50% ( M50 ) and 100% ( M100 ) based on nitrogen ( N ).【Result】The results showed that in the long-term garlic continuous cropping soil, organic fertilizer instead of chemical fertilizer treatment had a significant effect on the increase (20%) of garlic yield in the current season. Also, the content of N in continuous cropping soil and the proportion of soil > 2 mm aggregates were increased, and the N nutrient supply status and soil aggregate structure in the soil were improved. Among the treatments, 25% organic fertilizer instead of chemical fertilizer treatment ( N ) had the best yield and economic benefit of garlic, and also had a better repair effect on the decline of soil productivity of continuously cropping garlic. However, in non-continuous cropping soil without organic matter deficit, organic substitution treatment did not have a direct effect on increasing production. 【Conclusion】This study clarified that the application of organic fertilizer (partial organic fertilizer instead of chemical fertilizer treatment) based on chemical fertilizer application can only promote the formation of large-grained soil aggregates and enhance the holding capacity of soil available nutrients during the whole growth period in the continuous cropping garlic soil with obvious deficiency of soil organic matter. It also has a significant restoration effect on the degradation of continuously cropping garlic soil productivity. This study provides a useful reference for alleviating similar soil degradation problems and maintaining the sustainability of soil productivity in continuous cropping systems.

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  • Received:March 14,2023
  • Revised:June 12,2023
  • Adopted:August 15,2023
  • Online: August 15,2023
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