If your plants look discolored, stunted, or have low yields, a nutrient deficiency might be the culprit. Many nutrients other than nitrogen, including calcium and phosphorus, play a vital role in plant growth. If your plant exhibits a deficiency symptom, make sure to get a soil test before you add any amendments.
|Nitrogen||Required for all phases of growth and development||Lower leaves light green or yellowish; plant is stunted.||Blood meal, composted poultry manure, feather meal.|
|Phosphorus||Strengthens stems, helps in resistance to pests and diseases, fruiting and flowering||Lower leaves and stem are reddish; upper leaves are dull, pale; failure to flower or produce fruit.||Bone meal, colloidal or rock phosphate, fish meal|
|Potassium||Required for formation of all sugars, starches and proteins; contributes to cold-hardiness; root development.||Lower leaves spotted, mottled or curled; underdeveloped roots, stem tissue may appear weak||Composted manure, wood ashes, greensand, seaweed.|
|Calcium||Required for cell growth and division, helps plants use nitrogen||Tipburn on lettuce, blossom-end rot in pepper and tomatoes.||Bone meal, gypsum, lime.|
|Sulfur||Constituent of protein and certain vitamin complexes.||New leaves are yellowish.||Composted manure, gypsum, Sul-Po-Mag.|
|Magnesium||Constituent of chlorophyll; required for enzyme action.||Whitish patches appear first on older leaves, between leaf veins.||Sul-Po-Mag, Epsom salts|