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对绿肥还田后水稻生长期间土壤有机质的动态变化进行定位观测。结果表明,绿肥还田后土壤有机质含量先有一个快速增加的过程,随着绿肥的不断腐解,土壤有机质在达到一定含量后开始下降,随后随着水稻生育期的进程又逐步增加,但至水稻收割期土壤有机质总体含量还是比还田前有一定程度的提高。不同品种的绿肥在腐解过程中对土壤有机质的动态变化影响效果不一样,一般情况下紫云英等豆科绿肥腐解较快,黑麦草等禾本科绿肥腐解较慢,因此土壤有机质的积累和下降过程紫云英绿肥要快于禾本科绿肥。这一试验结果表明,绿肥还田对水稻生长期土壤有机质的影响是一个动态变化的过程,这种过程使土壤对水稻的养分供应和水稻自身的养分吸收会产生一定的影响,并最终影响到水稻的产量。
The dynamic changes of soil organic matter during the growth of rice after returning green manure were observed. The results showed that there was a rapid increase in soil organic matter content after returning green manure. With the constant decomposition of green manure, soil organic matter began to decline after reaching a certain content, and then gradually increased with the growth of rice The total content of soil organic matter in rice harvesting period is still a certain extent higher than before returning to the field. Different varieties of green manure in the decomposing process on the dynamic changes of soil organic matter is not the same effect, under normal circumstances such as leguminous green manure Biochemical decay faster, ryegrass and other grass green manure decompose slowly, so the soil organic matter The process of accumulation and decline of purple Yunying green manure to be faster than grass green manure. The results of this experiment show that the effect of returning green manure on soil organic matter during rice growth stage is a dynamic process that makes the soil have an impact on nutrient supply of rice and nutrient absorption of rice itself and eventually affect Rice production.