设施蔬菜土壤积累态磷、钾养分的有效利用研究

针对设施菜田磷、钾养分过量积累的现状,采用温室盆栽连续种植吸收的试验方法对磷、钾养分的有效利用进行了研究。结果表明,在高磷、钾含量的土壤上不施任何肥料难以保证产量水平;施用一定量的氮肥可以促进土壤磷、钾养分的吸收,提高产量,但不能获得高产;试验条件下,在保证氮肥适量供应的基础上,降低1/3正常磷、钾肥施用量,可以获得较高的白菜生物产量,说明合理调节氮、磷、钾肥,可以促进土壤磷、钾养分的有效利用,减少磷、钾肥的施用量。

The Effective-using Study on the Accumulating Phosphorus,Potassium of Greenhouse Vegetables in Soil

The effective using of phosphorus,potassium of greenhouse vegetables in soil is studied by the means of continuous potted test.The results showed that the output of cabbage which were planted in the soil of excessive accumulating phosphorus,potassium without any other fertilizer is lower;the output is increased and the absorption of phosphorus,potassium in soil is improved but no most output using some nitrogenous fertilizer.Under tested conditions,the output is higher by using appropriate nitrogenous fertilizer and 2/3 normal quantity of phosphorus,potassium.The rational proportion of nitrogenous fertilizer,phosphorus,potassium can improve the effective using of phosphorus,potassium in soil and reduce the using of phosphorus,potassium.