依据吉林省农业生产实际情况与需要，应用吸肥参数将供试的玉米划分高、中、低三个等级。
According to the actual condition of agricultural production and using fertilizer absorption parameters , the experimental maize were divided into three grades.
施用足量有机肥可以维持并提高土壤钾素含量和供钾水平。
Also, the application of manure increased the levels of potassium in Lou soil significantly.
通过大田试验，研究了不同供钾方式对烟叶含钾量的影响及提高石灰性土壤上烤烟含钾量的可能途径。结果表明，施钾能显著提高烟叶产量，其中以粉肥结合喷优丰处理效果最好。
Field experiment was conducted to study the effect of different supplying styles of potassium fertilizer on potassium content in flue-cured tobacco leaves and the methods to increase the content.
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