Potassium Deficiency

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Soybean requires large amounts of potassium. Soybean grain contains much higher levels of potassium than do cereal grains. Deficiency symptoms appear primarily on lower leaves as pale green to lemon-yellow leaf margins. Yellowing, then browning and necrosis of leaf margins, denotes an increase in the severity of the deficiency. Potassium deficiency may be overcome by side-dressing immediately after the problem is detected.