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Primary nutrients Nitrogen deficiency results in very stunted, spindly yellow plants or yellow leaves, sometimes with pink tints. There is a general yellowing of older leaves (bottom of plant). The rest of the plant is often light green. There are elongated twisted leaves on cauliflowers or other brassicas (cabbage family) growing in alkaline soil. Molybdenum deficiency is normally seen in cauliflowers and brassicas, particularly when growing in insufficiently alkaline soil.
Nutrients and Micronutrients. If your potato plants turn light green or yellow while the leaf veins remain green, or if they take on a scorched appearance, the soil may be deficient in nutrients. The most common deficiencies when growing potatoes are magnesium and sulfur.Iron and manganese, both micronutrients, are essential for potatoes as well.f your potato plants turn light green or yellow while the leaf veins remain green, or if they take on a scorched appearance, the soil may be deficient in nutrients. The most common deficiencies when growing potatoes are magnesium and sulfur.