Phosphorus deficiency-Tomato | Yara United States

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Nutrients

Tomato - Deformation

Symptoms
Phosphorus deficiency causes small and rigid leaves, the plant habitus is very erect. Growth is sparse, thus the plant shows a spindly appearence. Total height is almost normal. The bottom leaves show interveinal chloroses and necrotic leaflets.

Reasons
Phosphorus deficiency. Deficiency symptoms can also be found when soil P content is sufficient, but the tomato plants are grown at too low temperatures since phosphorus uptake is inhibited under these conditions.

Tomato - Discolouration

Symptoms
Beginning from the margin, the surface or undersurface of older leaves becomes dark green or purplish red at severe phosphorus deficiency.

Reasons
Phosphorus deficiency on the leaf. Deficiency symptoms can also be found when soil P content is sufficient, but the tomato plants are grown at too low temperatures since phosphorus uptake is inhibited under these conditions.

Tomato - Chlorosis

Symptoms
In some cultivars, the phosphorus deficiency appears as small brown dots which develop interveinally on the lower leaves. Starting from the leaf margin, chlorotic and subsequently necrotic areas progress. In other cases, the surface or undersurface of older leaves becomes dark green or purplish red at severe phosphorus deficiency.

Tomato - Chlorosis

Symptoms
In some cultivars, the phosphorus deficiency appears as small brown dots which develop interveinally on the lower leaves. Additionally, starting from the leaf margin, chlorotic and subsequently necrotic areas progress. The necroses may have a brown or a dull, dark olive, colour.

Phosphorus deficiency made worse by

Acidic or very alkaline (calcareaus) soils
Low organic matter
Cold or wet conditions
Crops with a poorly developed root system
Soils with low P reserves
Soils with a high phosphate capacity
Iron rich soils

Phosphorus is important for

Energy transfer
Nucleic acid formation
Protein synthesis
Cell membrane component
Carbohydrate metabolism

Yara recommended fertilizers for Phosphorus

YaraMila® 15-15-15

Tomato (field grown): Apply 300-1000 lbs YaraMila® 15-15-15/acre according to variety, yield potential, and soil test. YaraMila® 15-15-15 provides a balanced nitrogen approach by supplying both nitrate and ammoniacal nitrogen along with fully available Phosphate, soluble Potassium and Sulfur in a homogenous prill. Consult with your agronomist for local recommendations.

YaraMila® 21-7-14

Tomato (field grown): Apply 225-950 lbs YaraMila® 21-7-14 /acre in split applications according to variety, yield potential, and soil test. Utilizing YaraMila® 21-7-14 provides a balanced nitrogen approach by supplying both nitrate and ammoniacal nitrogen along with fully available Phosphate, soluble Potassium and Sulfur in a homogenous prill. Consult with your agronomist for local recommendations.

YaraVita® MAGPHOS™

Tomatoes (field grown): 1-2 quarts/acre. Apply at the 4 to 6 leaf stage with repeat applications at 10 to 14 day intervals if necessary. Water rate: 3 to 50 gallons/acre.

YaraVita® SENIPHOS™

Tomatoes (field grown): 2 to 4 applications of 2 quarts/acre commencing from flowering on second truss. Repeat at 10 to 14 day intervals. Water rate: 3 to 50 gallons/acre.