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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.
However, manganese is less mobile in a plant than magnesium so that the symptoms of deficiency appear first on young leaves. It is always best to get a sample to determine the exact cause of the symptoms. Other problems such as iron deficiency, nematodes, and herbicide injury may also cause leaves to yellow.y Susan Patterson, Master Gardener. The role of manganese in plants is important for healthy growth. Keep reading to learn more about how to fix manganese deficiencies to ensure the continual health of your plants.