Nitrogen deficiency-Tomato

Symptoms
Leaves are small and pale green to yellow in color when nitrogen is deficient. Symptoms are first seen in the old leaves and gradually progress to new growth. The plant appears thin and upright. With severe deficiency the old leaves become completely yellow or turn brown before dropping from the plant. Stems and veins look purple.

Reasons
Nitrogen deficiency Sulfur deficiency is similar in appearance to nitrogen deficiency, however it starts on younger leaves because sulfur is not as mobile as nitrogen within the plant.

Symptoms
When nitrogen is deficient leaves are small and pale green to yellow in color. Symptoms are first seen in the old leaves and gradually progress to new growth. The plant appears thin and upright. With severe deficiency the old leaves become completely yellow or turn brown before dropping from the plant. Stems and veins look purple. Growth is clearly stunted. Sulphur is not as mobile as nitrogen within the plant. For that reason symptoms start on younger leaves and progress to older plant parts.The leaves are stiff and curled downward. They develop an interveinal chlorosis turning yellowish green to yellow. Stems, veins and petioles look purple.

Reasons
Nitrogen deficiency (middle) compared to sulphur deficiency (right) and optimum supply (left)

Symptoms
Leaves are small and pale green to yellow in color when nitrogen is deficient. Symptoms are first seen on the old leaves and gradually progress to new growth. With severe deficiency the old leaves become completely yellow or turn brown before dropping from the plant.

Reasons
Nitrogen deficiency Sulphur deficiency is similar in appearance to nitrogen deficiency, however it begins in younger leaves because sulphur is not as mobile as nitrogen within the plant.

Symptoms
Leaves are smaller and uniformly pale green to yellow in color when nitrogen is deficient. Symptoms are first seen in the old leaves and gradually progress to new growth.

Reasons
Nitrogen deficiency (right) Sulfur deficiency is similar in appearance to nitrogen deficiency, however it starts on younger leaves because sulfur is not as mobile as nitrogen within the plant.

Symptoms
Leaves are smaller and uniformly pale green to yellow in color when nitrogen is deficient. Symptoms are first seen in the old leaves and gradually progress to new growth.

Reasons
Nitrogen deficiency (right) Sulfur deficiency is similar in appearance to nitrogen deficiency, however it starts on younger leaves because sulfur is not as mobile as nitrogen within the plant.