少耕分厢撒播水稻田土壤微生物活性研究

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。

MICROBIAL ACTIVITIES IN RICE SOILS OF REDUCED TILLAGE AND LOCATED AREA BROAD CAST SOWING

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.