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For irrigation water boron is required for certain metabolic activities in plants. However, higher boron levels accelerate plant decay and expiration. Different plants can withstand different boron levels. For example, the optimal boron concentration range is 0.3–0.5 mg/L for citrus and grapes but is 0.5–0.75 mg/L for corn. Thus, the B-reduction in irrigation waters seems to be the most important...
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