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对主要土类棕壤、潮土和褐土的高产和中低产田的42个土样进行研究,结果表明,高产吨粮田土壤养分平均含量为:有机质10.86g/kg,全氮0.94g/Kg,水解氮57.2mg/kg,速效磷13.5mg/Kg,速效钾107.3mg/kg,微量元素较丰富。逐步回归分析显示,土壤速效磷仍是限制作物产量提高的限制因子,其对产量的贡献率为中低产田大于吨粮田;潮土大于褐土又大于棕壤。提高土壤有机质含量对于增加土壤磷素有效性和改善磷素供应有积极作用。
The results showed that the average contents of soil nutrients in the high-yielding tillage fields were: organic matter (10.86g / kg), total nitrogen (0.94g / Kg, hydrolyzed nitrogen 57.2mg / kg, available phosphorus 13.5mg / Kg, available potassium 107.3mg / kg, more abundant trace elements. Stepwise regression analysis showed that available phosphorus in soil was still the limiting factor to limit the increase of crop yield. Its contribution rate to yield was higher than that of the grain yield field; the content of fluvo-aquic soil was larger than that of brown soil and brown soil. Increasing soil organic matter content has a positive effect on increasing soil phosphorus availability and improving phosphorus supply.