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1980—1986年,田间试验结果表明:不同绿肥压青均能增加壤有机质,而不压(?)的对照处理壤有机质略有下降。绿肥不同生育期压青试验由于土壤有机质含量很低压青后各处理土壤有机质有不同程度的提高,但提高到一定水平后增加速度开始变慢。同一种绿肥压青的鲜草量和土壤有机质的积累成正相关。压入绿肥植株碳氮比直接关系到土壤有机质积累量。中、低肥力土壤上绿肥压青有机质的积累优于高肥力土壤。绿肥压青不仅能增加耕层土壤有机质,而且能提高深层(?)壤有机质水平.
From 1980 to 1986, field experiments showed that different green manure greening could increase soil organic matter, while organic matter slightly decreased in the control treatment without pressure (?). Green manure in different growth stages of greening test due to the low content of soil organic matter after the treatment of soil organic matter in varying degrees, but increased to a certain level began to slow down the rate of increase. The amount of green grass with the same green manure and soil organic matter accumulation was positively correlated. Pressing green manure plant C / N ratio is directly related to the accumulation of soil organic matter. Medium and low fertility of green manure on the accumulation of organic matter than the high-fertility of soil. Green manure greening can not only increase the organic matter in the topsoil, but also increase the soil organic matter level in the deep layer.