The Changes in Guilin Paddy Soil Organic Matter and Rice Yield under Long-Term Fertilization

Rational fertilization is an important measure to increase crop yield and soil fertility. Through analysis, this paper aims to master the change characteristics of soil organic matter and rice yield under different fertilizer treatments, in order to provide an important reference for the sustainable use of soil and effective fertilization. Long-term (19 years) rice crop rotation experiments in waterloggogenic paddy soil were conducted to investigate the change trend of crop grain yield and soil organic matter with time, reveal the dynamic characteristics and relationship between main fertility factors and crop yields using comparative analysis at three sites with conventional fertilization and non-fertilization in Guilin. The results showed that compared with previous years, the rice yield increased by 53% under the fertilization treatment and degreased by 66% under the control. Over the years, the average soil organic matter (SOM) content under fertilization treatment was 23% higher than under CK treatment. This indicates that chemical fertilizer and organic manure application can increase the rice yield and soil organic matter, and high rice yield can be attributed to the SOM increase.