Continuous fertilization for 22 years would result in the gradual decreasing of soil total potassium content directly connected with the various fertilizations, which leads to a lack of potassium in red dry land.
连续施肥22年,土壤全钾含量随着施肥年限的增加,均有逐渐降低的趋势,其下降幅度因施肥不同而变化,造成了红壤旱地钾素的缺乏。
参考来源 - 长期定位施肥对红壤肥力及作物的影响·2,447,543篇论文数据，部分数据来源于NoteExpress
The results showed that the average contents of soil total potassium STK and soil available potassium SAK were 21.
结果表明：供试土壤中速效钾的动态变化特征各异，其“最低值”的大小和出现的茬数也不相同。
The results showed that the average contents of soil total potassium(STK) and soil available potassium(SAK) were(21.
结果表明，该区土壤有机质层全钾的平均含量为（21。
Soil total potassium content, soil available phosphorus, soil total potassium content and soil available potassium, Their variation is not obvious.
而土壤全磷、土壤全钾、土壤有效磷、土壤有效钾随着土壤深度的增加，其变化规律不明显。
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