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Chinese Agricultural Science Bulletin ›› 2024, Vol. 40 ›› Issue (32): 77-84.doi: 10.11924/j.issn.1000-6850.casb2024-0404

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Correlation Analysis Between Soil Organic Matter Content and Grain Yield: A Case Study of Lankao County in Henan

FAN Peng1,2(), YANG Qingwei1,2(), GAO Chao1, LI Di1, WANG Lei1,2, YANG Xihui1,2   

  1. 1 Institute of Geography, Henan Academy of Sciences, Zhengzhou 450052
    2 Henan Kefa Geography Research Institute Co., Ltd, Zhengzhou 450052
  • Received:2024-06-17 Revised:2024-09-04 Online:2024-11-15 Published:2024-11-12

Abstract:

By analyzing the influence mode and degree of soil organic matter content on grain yield per unit area, the study provides a theoretical reference for the determination of organic matter content in soil testing and formula fertilization of cultivated land, and also provides relevant suggestions for cost reduction and efficiency increase in grain production. This paper took Lancao County of Henan Province as an example, the influence of soil organic matter content on grain yield was assessed by using trend and fitting correlation analysis, based on the existing annual renewal evaluation results of farmland quality of 203 administrative villages (2019). The results showed that grain yield would not increase continuously with the increase of soil organic matter content. There existed a critical value of soil organic matter content that could maximize the grain yield per unit area, so the relationship between the two showed a downward parabolic shape on the fitted curve. According to the three fitting curves, the critical value of soil organic matter content was calculated to be between 12.50-13.00 g/kg in Lankao County. The critical value of soil organic matter content in Lankao County was determined to be 15.00 g/kg by referring to the relevant requirements in the “Well-facilitated farmland construction—General rules” (GB/T 30600—2022). It was recommended that soil improvement should be tailored to the actual conditions. Once the soil organic matter content reached the ideal level, it was advisable to reduce the application of organic amendments in order to improve cost-effectiveness and efficiency in crop production.

Key words: cultivated land quality grading, soil organic matter content, grain yield, correlation, critical value, trend analysis method