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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.
Providing your plants with the nutrients and growing conditions they need helps your plants grow normally and stay healthy. Without the right nutrients and growing environment, your plants will grow poorly, and they can become susceptible to insects and diseases. There are three major nutrients that can limit the growth of your plants and a variety of conditions that your plants need to sustain healthy growth. The three nutrients that plants use in the greatest quantities are nitrogen, phosphorous and potassium.