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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.
1 Phosphorus-this nutrient is critical in the germination and growth of seeds, flowers, fruit, and roots. 2  When phosphorus is deficient, growth is reduced and leaves fall off prematurely. 3  Plants lacking phosphorus produce dull, bluish-green leaves that turn a purplish or bronze color with brown edges.ater and air provide plants with three necessary nutrients: carbon, hydrogen and oxygen, however, in the soil there are thirteen more nutrients needed for plants to grow. This is why a soil test can help you grow healthy, verdant plants.