For an unfertilized temperate region forested soil with a large amount of interlayer fixed potassium,but a low amount of readily available potassium,the level of readily available potassium is expected to be higher in early spring than in late fall.

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During winter, biological activity in soil decreases, and the uptake of potassium by roots is also reduced. As a result, the level of readily available potassium decreases in late fall. In early spring, with the increase in temperature and the resumption of biological activity, the level of readily available potassium increases. However, the large amount of interlayer fixed potassium in the soil will still contribute to the overall potassium availability in the soil.

For an Unfertilized Temperate Region Forested Soil with a Large