Calcium deficiency-Tomato | Yara Australia

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Nutrients

Tomato - Discolouration

Symptoms
Light case of Blossom End Rot (BER). More severely affected plants show a dark, sunken zone on the blossom end of the ripened fruit. This zone is sharply delimited against the fruit. The fruits ripen prematurely and are not marketable.

Reasons
Calcium deficiency on the fruit, also called Blossom End Rot (BER). BER develops in fruits that contain less than 0.08% Ca (healthy fruit contains 0.12-0.25 % Ca) . Water deficiency and therefore limited Ca support to the fruit may also be a cause of BER.

Tomato - Rot

Symptoms
Affected plants show a dark, sunken zone on the blossom end of the ripened fruit. This zone is sharply delimited against the fruit. The fruits ripen prematurely and are not marketable.

Calcium deficiency made worse by

Acidic soils
Sandy or light soils (leaching)
Acid peat soils
Soils rich in sodium
Soils rich in aluminium
Drought conditions
Fruit high in nitrogen or potassium
Large fruit

Calcium is important for

Cell division
Cell elongation
Proper working of cell membranes
Permeability of cell membranes

Yara recommended fertilizers for Calcium

YaraTera CALCINIT

Tomato (field grown): Apply 200 - 300 kg/ha from first flower visible to first fruit harvested.

YaraVita CALTRAC

Tomato (field grown): One to four applications of 5 L/ha from flowering on second truss onwards, repeated at 7 day intervals. Water rate: 50-500 L/ha. Note: Caltrac 400 may leave white marks upon the fruit, similar to other suspension concentrate products. It may be necessary to clean the fruit prior to sale.

YaraVita SENIPHOS

Tomato (field grown): 2 to 4 applications of 5 L/ha commencing at flowering on second truss onwards. Repeat at 10 to 14 day intervals. Water rate: 200-500 L/ha.