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通过对砂姜黑土区域土壤速效钾的分析及其固钾能力的室内模拟研究，得出砂姜黑土１０年间速效钾下降了４９．１ｍｇ／ｋｇ，其固钾量和固钾率远大于对比土壤潮土。冬小麦田间多点试验表明，施钾增加小麦分蘖、次生根与叶面积系数，最终增加了产量。但并非施钾越多越好，最佳施钾量因地力条件而定，高地力条件为９４．５ｋｇ／ｈｍ２，低地力条件下为１１２．５ｋｇ／ｈｍ２。
Through analyzing the soil available potassium in Shajiang black soil area and the laboratory simulation of potassium fixation ability, the available potassium in Shajiang black soil decreased by 49.1 mg / kg in 10 years, and its potassium fixation rate and potassium fixation rate were much larger than those in contrast soil Chao soil. Multi-point experiments in winter wheat field showed that applying potassium increased wheat tillering, secondary root and leaf area coefficient and finally increased the yield. However, not the more potassium the better, the best potassium application due to geotechnical conditions, high-altitude conditions for the 94.5kg / hm2, low-soil conditions for the 112.5kg / hm2.