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绿肥对当季作物的增产效果,虽然已为广大的生产实践和科学研究所肯定,但其对维持和提高土壤肥力方面的作用,至今尚有分歧的意见。有人认为,新鲜绿肥或秸杆直接施入土壤,将促进土壤有机质的矿化(激发效应)。由于这种作用的存在,施用新鲜的有机物质,并不一定都能有助于土壤有机质的积累,在小量施用的情况下,甚至还会导致相反的结果。另一方面,有人认为,激发效应不足以对土壤有机质的贮量产生不利的影响。甚至有人认为,施用新鲜绿肥有抑制土壤有机质矿化的作用。 我国广大地区农民,普遍有种植绿肥的习惯。一般常将绿肥直接翻耕或压青施入土内,每亩用量几百斤至数千斤不等;也有先将绿肥与稻草、河泥等混合沤制后施用的经验。显然,阐明绿肥在不同施用方法
Although the increasing effect of green manure on seasonal crops has been affirmed by extensive production practices and scientific research, its role in maintaining and enhancing soil fertility has so far been divided. Some people think that fresh green manure or straw applied directly to the soil, will promote the mineralization of soil organic matter (excitation effect). Because of this effect, the application of fresh organic matter does not always contribute to the accumulation of soil organic matter and, in the case of small amounts, even leads to the opposite result. On the other hand, some people think that the stimulus effect is not enough to adversely affect the storage of soil organic matter. Some people even think that the application of fresh green manure can inhibit the mineralization of soil organic matter. Farmers in vast areas of our country generally have the habit of planting green manures. Generally green manure directly tillage or green pressure into the soil, per acre amount of several hundred pounds to several kilograms range; also first green manure and straw, river mud and other mixed system after the application of experience. Obviously, to clarify the green manure in different application methods