The correct answer is: C. consumptive irrigation requirement
Consumptive use is the amount of water that is used by a crop during its full growth. It includes the water that is transpired by the crop and the water that is evaporated from the soil surface. The consumptive irrigation requirement is the amount of irrigation water that is required to meet the consumptive use of the crop.
Effective rainfall is the amount of rainfall that is available for plant use. It is the difference between the total rainfall and the amount of rainfall that is lost to runoff, infiltration, and evaporation.
Net irrigation requirement is the amount of irrigation water that is required to meet the consumptive use of the crop after accounting for effective rainfall. It is calculated by subtracting the effective rainfall from the consumptive use.
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