一、缘起活跃在土壤中的亿万微生物是增进地力,有利作物生长和根系发育的一项重要因素。人们从实践中认识到肥地“发活”,瘦地“发死”。实质上是肥地有机质较高,疏松湿润,那里的微生物活性强,瘦地的有机质少,板结,那里的微生物活性差。但是,将含有若干亿活的有益微生物制成菌肥施入大田土壤后往往不能见其久期成活。这是因为1.这些菌不能在如汪洋大海般的土著微生物中优胜立足。2.土壤 First, the origin of hundreds of millions of microorganisms active in the soil is an important factor to promote fertility, favorable crop growth and root development. In practice, people realize that fat land is “alive” and that it is “dead”. Essentially fat organic matter higher, loose and moist, where microbial activity, thin organic matter less, compaction, where microbial activity is poor. However, it is not always possible to see the long-term survival of microbial fertilizers that contain some billions of viable microbes into the soil of the field. This is because 1. These bacteria can not prevail over indigenous microbes like oceans. Soil