Modern agriculture relies heavily on irrigation. all but one of the factors listed is an ecological problem associated with irrigation. that is
a) soil acidification.
b) ground water depletion.
c) the rise in the local water table.
d) addition of soluble liquid fertilizers.

D) addition of soluble liquid fertilizers.

Explanation:

The main problem with the rise in modern green revolution as the requirement of the more water and pesticides for the high yielding variety of seeds and the usage of more moisture by the roots of the plants and thus required additional amount of water that led to the problems of surface runoff and a increase in the acidification of nearby river and ponds.  Theses harmful liquid fertilizers create an ecological problem when they reach higher tropic levels of the food chain.

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