The independent variable is the presence/absence of nets; while the dependent variable is the number of berries.
In experiments, an independent variable is an element the researcher is manipulating on purpose. In the case of the farmer, the element that is being manipulated is the use of nets.
Therefore, the independent variable will be the presence/absence of nets in each row of bushes.
On the other hand, a dependent variable is a factor affected by the independent variable. In this case, it is expected the use of nets increases the number of berries the farmer can collect.
This means the dependent variable is the number of berries.
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