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一、草炭直接改土的效果和出现的问题在施用数量适当和施用方法合理的情况下,草炭直接改土,对当年及以后二、三年用于小麦、大豆、玉米上,都有比较明显的增产效果,各年增产幅度都在10—20％以上,并能改善土壤理化性状;耕层有机质增加1.5—2.0％,容重降低0.1—0.2克/立方厘米,孔隙度增加10％以上;全氮增加0.02—0.04％,全磷增加0.01—0.02％,土壤速效养分也有增加。但是,如果施用量过多和施法不当,再遇低温早霜年份,则玉米出现贪青晚熟,草炭肥效不高的现象。据1977年6月13日在
First, the direct effect of peat turf and the problems in the application of the appropriate amount and application of reasonable circumstances, the direct conversion of peat to the soil, for the year and after two or three years for wheat, soybeans, corn, there is more obvious Yield increase of 10-20% each year, and can improve soil physical and chemical properties; organic matter increased 1.5-2.0%, bulk density decreased 0.1-0.2 g / cm3, the porosity increased by 10%; Nitrogen increased 0.02-0.04%, total phosphorus increased 0.01-0.02%, soil available nutrients also increased. However, if the application amount is too high and the law is improperly applied, the frost-late-frost season will occur again when the corn is cold, and the phenomenon of the corn is late-blooming and the peat efficiency is not high. According to June 13, 1977 at