摘要
试验于1083～1987年进行。结果表明:少耕法避免了常耕法过多犁耙对土壤的破坏,使耕层土壤形成“上糊下松”的结构,改善了通气性能,为水稻生长和微生物活动创造了良好条件,微生物数量特别是好气性微生物数量显著增加,氧化代谢加强,土壤酶活性和土壤呼吸强度也明显提高,证明少耕土壤的肥力水平比常耕土壤要高。
The experiment was conducted from 1983 to 1987. Under reducedtillage and located area-broadcast sowing, paddy fields avoid much soil destruc-tion caused by conventional tillage. This tillage and planting method makes thetillage layers form an 'sticky upper and loose lower' soil structure. As a resultventilation is improved; good conditions for the growth of rice crops and the ac-tivities of micro-organisms are created; the quantity of microorganisms is increas-ed tremendously and their oxidizing metabolism is virtually intensified; theactivities of soil enzymes and microbial respiration are also increased. The fertilitylevel in less tilled soils is higher than that of conventionally tilled soils.
关键词
水稻土
少耕
撒播
微生物
水稻
paddy soil
minimal tillage
broadcast sowing
soil microorganism/microbial activity
