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钱塘江口两岸新围涂地(田),系石灰性盐土,土壤含全磷量较为丰富,一般在0.120～0.190%。但据分析,所含磷大部分是与土壤中的钙结合为磷酸钙的固定形态,可被作物吸收利用的磷素含量很低,一般仅3～5ppm。因此,施用各种磷肥对稻、棉、油料、绿肥等作物,均有增产效果,其增产幅度为5～125%不等。用过磷酸钙、钙镁磷肥、昆阳磷矿粉三种主要矿质磷肥,用7斤等量磷素对早、晚稻进行试验,结果对早稻当季增产效果依次为过磷酸钙、钙镁磷肥、磷矿粉,分别增产17%、
The Xinwei Tujia (field) on both banks of the Qiantang River Estuary is a calcareous saline soil. The soil contains abundant phosphorus, generally between 0.120 and 0.190%. However, according to the analysis, most of the phosphorus contained is in a fixed form combined with the calcium in the soil to be calcium phosphate, and the content of phosphorus which can be absorbed and utilized by crops is very low, generally only 3 to 5 ppm. Therefore, the application of various phosphate fertilizer on rice, cotton, oil, green manures and other crops, have increased yield, the rate of increase of 5 to 125% range. With the superphosphate, calcium magnesium phosphate, Kunyang phosphate rock three kinds of mineral phosphate, with 7 kg equivalent amount of phosphorus on the early and late rice, the results of the early rice season increased production were superphosphate, calcium magnesium phosphate , Phosphate rock, respectively, an increase of 17%