My soil is misbehaving! Options

[BugTangerine]

I don't get it. One day I fertilize my soil to the max, best quality. But then the next day there are a few patches that have gone down in quality. Why does it lose quality after only one day? Is this normal?

[Kozunai]

In Animal Parade this situation is a bit different. I saw this topic earlier but didn't bother commenting, because I thought it was common knowledge.

In Animal Parade the soil is darker the higher the quality, and the soil will start to lose quality if you fertilize before you sow the seeds. The only way to keep it from going down, is to sow your seeds first, then throw your fertalizer down. Now of course, it doesn't mean that you won't still get decent crops out of them, that is completely random.