作物从土壤里能不断的吸收所需肥水,主要依靠土壤有良好的结构,而土壤的结构是土壤腐殖质与土壤矿质结合一起形成的。土壤腐殖质的积累,除受土壤本身质地与地理环境影响外,主要受着耕作、轮作、施肥制度及水热条件的影响,也有其一定的稳定性。如我省南北土壤有机质,从解放到现 Crops from the soil can continue to absorb the required fertilizer, mainly rely on the soil has a good structure, and soil structure is the combination of soil humus and soil mineral together. Soil humus accumulation, except by the soil itself and the geographical environment, mainly affected by farming, rotation, fertilization system and hydrothermal conditions, but also has some stability. As the province of North and South soil organic matter, from liberation to the present