One rainfall won’t end a drought. Under normal conditions in my home area in Central Europe, during summer it will surely be dry, but if you are digging, there would be a certain amount of humidity being left in the soil deeper down.
When there is a drought, even the humidity deeper down is lost. And even if it is raining then, only the topmost layers of soil are getting wet before the humidity evaporates again. But to have a healthy plant life and enough crops there needs to be enough humidity in the deeper layers. And this is missing more often in the past years.
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