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Calcium deficiency in watermelon crops causes a physical disorder.
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Due to which there is rotting in the watermelon fruit, this disorder is not caused by any insect or disease . It is caused by a lack of calcium
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If there is a deficiency of calcium in the soil, then the plant is unable to fulfill it, there are signs of deficiency in fruits.
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To overcome its deficiency, use calcium nitrate @ 10 kg/acre as soil treatment.