晋南石灰性土壤钾素变化及小麦施钾效果

Potash Status in Calcareous Soil and the Effect of Potassium Fertilizer on Wheat in the South of Shanxi Province

晋南石灰性土壤钾素动态研究表明：潮土、褐土土壤速效钾含量均呈下降趋势，其中潮土下降３１．２５ｍｇ／ｋｇ，褐土下降１５．７５ｍｇ／ｋｇ。土壤质地类型、农业生态区及种植制度不同，土壤速效钾含量下降不同。小麦钾肥试验结果表明：亩施Ｋ２ＳＯ４５～２０ｋｇ，产量增加５２．９～１１１．５ｋｇ／亩，净增收益３２．７～６２．６元／亩。

The potash status in calcareous soil is studied in the South of Shanxi.The results showed that quick acting potassium level in Chao soil and Cinnanon soil tended to decrease.It decrease 31.25 mg/kg in Chao soil and 15.75 mg/kg in Cinnanon soil.It differed with soil types,soils in different agro ecological areas and soils in different crop rotation system.The results of the potassium fertilizer experiment on wheat indicated that the application of potassium to wheat led to the increase of output,simultaneously,obtained,maximum yield application rate and economic optimum application rate on wheat.