Severe cases will be accompanied by nutrient deficiency symptoms. See A1 and A2 below Nutrient levels difficult to maintain because of small volume of soil. Apply fertilizers often and in low concentrations. A. Leaves discolored 1. Underside of leaves and stems becomes reddish-purple.
Leaves are small and roots stunted.
Soil may be too acid. Use 2 tablespoons to 1 gallon of water. General indication of nitrogen deficiency is lack of green in the retarded growth with stems and leaves. If the soil is very deficient in nitrogen, symptoms may appear early in the seedling stage. If there is adequate nitrogen to support early growth only, deficiency symptoms may appear later.