山东寿光日光温室土壤有效钾的研究

对寿光市日光温室(冬暖大棚)蔬菜施肥调查表明:温室蔬菜施肥量高,土壤钾有盈余,盈余量为453.0 kg/hm2。对寿光不同类型日光温室蔬菜土壤分析表明,土壤有效钾平均含量为391.0 mg/kg(61个土样)。温室土壤是露地土壤有效钾含量的2.92倍。土壤有效钾含量与温室年限间具有极显著的正相关性,相关系数为0.5746,随日光温室种植年限的增加,土壤中的有效钾有一定的累积。在寿光采集了8个8 m深的土壤剖面,研究土壤有效钾在剖面中的变化,结果表明:各层土壤有效钾含量与土壤质地有密切关系,北部4个剖面上层土壤有效钾含量明显高于下层土壤,东南部4个剖面下层都出现了比表层有效钾含量高的现象;土壤有效钾有淋洗现象。

Study on Available Potassium of Greenhouse Soil in Shouguang City of Shandong Province

Fertilization rate of greenhouse vegetable in Shouguang City was investigated.The results showed that the fertilization rate was high and the soil K was surplus,which was 453.0 kg/hm2.The different types of soils in greenhouse were also analyzed.The results indicated that the average content of soil available K was 391.0 mg/kg of 61 samples in greenhouse,which was 2.92 times than that in open field.There was evidently positive correlation between soil available K content and greenhouse ages and the correlation coefficient was 0.5746.Eight soil profiles were collected from north and southeast of Shouguang City to study the change of soil available K.The results showed that the content of soil available K was closely related with the soil texture.The available K content in upper soil was obviously higher than that in subsoil of the north four profiles,which was contrary to that in the southeast four profiles.The soil available K could also be leached from upper layer to the lower.