Organic Fertilizer Application Effects on Soil Agglomeration Stability and Organic Carbon and Total Nitrogen Distribution: A Meta-Analysis

Abstract

The application of organic fertilizers is a standard measure of circular agriculture, which can purify the environment, ensure food safety and strengthen the sustainable use of soil. The purpose of this study was to evaluate the effects of organic fertilizers on the stability of soil aggregates and soil fertility using a meta-analysis. A total of 169 case-controlled studies from 45 papers were included through screening, and Wordy sentences 169 soil data from the organic fertilizer group and 169 soil data from the control group (CK) were collected. The stability of meta-analysis results after combining effect sizes was assessed by sensitivity analysis, and the publication bias was evaluated by funnel plot. Meta-analysis results showed that the application of organic fertilizer significantly affected the mean weight diameter (MWD) (P<0.05), increased the organic carbon (SOC) content of the soil (P<0.05) .and significantly increased the total nitrogen (STN) content of the earth (P<0.05). Funnel plot analysis showed that there was only a small amount of publication bias in the study .and sensitivity research showed that the analysis was stable and reliable. In conclusion, the application of organic fertilizer can significantly affect the stability of soil aggregates and has a potentially positive effect on improving soil fertility. This meta-analysis provides a scientific basis for the rational utilization of organic fertilizers and soil structure optimization in China.