Phosphorus Deficiency

A shortage of phosphorus can cause stunting but the plant remains green. Phosphorus deficient plants often have a purple tint to the leaves and stems starting on the lower leaves. A shortage of phosphorus may delay the maturity of several crops including corn, cotton, soybeans, and others. Some crops like carrots develop poor root systems. On the other hand, an excess of phosphorus in the soil ties up several plant nutrients such as iron. Soil testing will indicate the amount of phosphorus a soil needs. To correct a deficiency, add phosphorus.