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Is this explaination is correct?
Good at' indicates ability, whereas 'good in' doesn't.
Similarly, poor at and poor in.
He's good at communication skills.
He is poor at English. (lacking in ability)
The soil in poor in nutrients. (lacking in quality)
The nutrients in the soil is poor .
He is not good at English .
He is skillful in communication .
There difference there is that the soil is a container.
The soil contains the quality of "bad" "The soil is bad in quality."
I am good at math. Here think about math as an object, and you are "good" when nearby it. It is a little difficult to understand, but remember that the meaning is metaphorical:)
He is good at English listening <---better
The land is not fertile without sufficient nutrients in the soil