Nitrogen - When a plant is nitrogen deficient the plant will have a unhealthy yellowing look about it. The lower leaves with curl, wilt and die. Nitrogen deficiency will product limited fruit.
Phosphorus - When a plant is phosphorus deficient it will appear thin and stringy. the trunk will be thin and stretched.
Potassium - A lack of potassium in plants have many signs. One sign is the brown spotting under the leaves. Another is spotting on the bottom of fruit.
Calcium - Calcium is critical in root development. If roots don't develop it is because a lack of calcium. You should add calcium before every planting. Gypsum is good for areas with limited rain fall as rainfall will dilute the calcium already in the earth.
Boron -
Sulfur -
Zinc - A lack of zinc will cause leaves to be tiny, much tinier than normal leaves.
Iron -
Chlorine -
Manganese -
Magnesium -
Copper -
Molybdenum -
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