Given below are two statements, one is labeled as Assertion (A) and the other one is labeled as Reason (R).
Assertion (A) : Water requirement for wheat crops varies from 300 to 600 mm.
Reason (R) : Water requirement varies depending on the soil type and rainfall and variety.
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The total water requirement of a crop is a dynamic value. It is always governed by the local climatic demand (rainfall, temperature), soil physical properties, and crop genetics (variety).