河南省土壤库中钾养分资源状况的研究

Study on change of soil potassium resources in Henan Province

通过对河南省1995年取得的1130个土样进行了土壤全钾、速效钾和缓效钾的测定 ,并同第二次土壤普查 (1985年 )的结果进行了比较。表明河南省土壤速效钾含量平均为102 6mg/kg,与第二次土壤普查相比下降了30 4mg/kg,年平均下降3 04mg/kg;以豫东区土壤速效钾含量下降最多 ,为46 5 % ,豫中区下降最少 ,仅为6 8 %。土壤缓效钾含量低的仅为177 5mg/kg,高的达2553mg/kg,平均为863mg/kg。土壤全钾平均含量为17 2g/kg,也下降了10 4 % ;下降幅度最大的为潮土达16 9 % ,褐土下降最低为0 5 %。

Soil total potassium,readily available potassium and slow release potassium were determined by analyzing 1130 soil samples taken recently and were compared with the determinations of the National Second Soil Survey during 1985.Results showed that soil available potassium content was 102 6mg/kg,an annual average decrease by 3 04mg/kg;the average content of slow release potassium was 863mg/kg,ranging from 177 5mg/kg to 2553mg/kg; the average content of total potassium was 17 2g/kg,decrease by 10 4%,ranging from 16 9% for Shajiang black soil to 0 5% for cinnamon soil.