In The Good Earth, what does Wang Lung do with his eldest son because of his moodiness and restlessness?

The answer to this can be found in Chapter 22, which is
when O-Lan tells Wang Lung the reason for his eldest son's strange behaviour as he
misses more and more school and comes to behave in a way that is  more and more bizarre
and odd. For O-Lan, the solution to this problem is easy. When she worked in the Old
Lord's house, when his sons began to act in this way, he found a female slave for them
so that they could get rid of their sexual frustration. Wang Lung decides to hatch a
different plan in order to help his son:

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I will betroth him and we will marry him early,
and there is that to be
done.

Wang Lung therefore
decides to try and end his eldest son's restlessness by finding a wife for him to become
betrothed to and then marrying him so that he can dispense with his sexual
frustrations.