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太湖流域冲积平原的汀煞白土,是一种低产土壤,且分布面积甚广,仅长兴县就有14万亩。其特点是:耕层浅薄,土壤有机质含量仅1.0~1.5%,全氮約0.1%,全磷0.068%,速效磷含量更低,仅百万分之五;土壤酸碱度为5.2,机械組成以粉砂为主,汀浆板結性严重,以往长不起紫云英。1963年加兴地委与长兴县委組织改土工作組,采取以磷增氮等措施,在瘠薄的汀煞白土上試
Tinghuo alluvial plain in the Taihu Lake Basin is a low-yielding soil with a vast distribution area of only 14,000 mu in Changxing County. Its characteristics are: shallow layer of soil, soil organic matter content of only 1.0 to 1.5%, about 0.1% of total nitrogen, total phosphorus 0.068%, lower available phosphorus, only 5 millionths; soil pH is 5.2, the mechanical composition of powder Sand-based, Ting serious plate knot, in the past can not afford to Swallows. In 1963, Ghinging prefectural committee and Changxing county committee organized a soil improvement working group to take measures such as increasing phosphorus and nitrogen and so on. On the barren Tingbian clay