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Why some pull leaf samples at pollination

Final sampling time Samples were pulled at the V5 stage in 2020. Zinc was borderline. Adding it might have boosted yields, even though zinc was added with the starter. At the 12-leaf stage, tissue tests showed that key nutrient levels for nitrogen and potassium were dropping, most likely because the field had just suffered through a very dry period. Rain refreshed the plants, but nutrient levels werenโ€™t up yet when samples were taken hours after the rain. The recommended time to take the thir...
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