太湖县耕地钾素亏缺及补钾途径

通过对太湖县耕地主要土壤类型的取样化验 ,分析了全县不同土种供钾状况 ,与第二次土壤普查数据相比较 ,速效钾由 70mg/kg下降到 5 0mg/kg ,缺钾面积增加了 2 0个百分点。钾素亏缺的原因是钾素投入总量不足 ;氮磷钾投入比例不当 ;以及淋失损失等。补钾的途径是充分利用有机钾源 ;充分挖掘土壤潜在钾源 ;科学施用无机钾肥

Shortage of Potassium on Cultivated Land in Taihu County and Its ways of Replenishment

the author carried out soil sample analysis of the main types of soil of the cultivated land in Taihu County and analyzed the state of supplement of potassium of various types of soil in the whole county. Comparing with the data of the second general survey of soil, it was found the content of rapidly available potassium decreased from 70mg/kg to 50mg/kg and the area of potassium shortage increased 20 percent. The reasons are :insufficient total of spreading potassium, improper proportion of spreading nitrogen, phosphorus and potassium, lose of being carried away by rain, etc.The ways of replenishing potassium are: making good use of organic potassium resources sufficiently, tapping mineral resources of potassium from soil sufficiently, and spreading inorganic resources of potassium scientifically.