Manganese deficiency-Tomato | Yara South Africa

Symptoms
Manganese deficient plants show chlorotic zones in the intercostal areas of the younger leaves, whereas the veins and a small seam around them remain green. With ongoing deficiency, gradually growing necrotic spots appear in the chlorotic interveinal tissue. In some cases, symptoms may also appear on older leaves first.

Reasons
Manganese deficiency on the leaf. Similar symptoms can be found with iron deficiency, but the chlorosis is more severe then, and the veins do not remain green at severe deficiency.

Manganese deficiency made worse by

Organic soils
Sandy soils
High pH
Cold wet periods
Fluffy soils

Manganese is important for

Nitrate reduction
Photosynthesis
Protein synthesis

Yara recommended fertilizers for Manganese

YaraTera CHELATE 1089

Tomato: Field Grown - Apply 2 kg/ha before planting (can be coated on pre-plant fertilizers) Apply a further 1 kg/ha at 3, 5, 7 weeks after planting. Can also be applied as a foliar application: Up to 150 g/100L water.

YaraTera CHELATE 1090

YaraTera MICROFLEX GA

Tomato: Apply 2 g of YaraTera Microflex GA per 100L of water in the stock solution.

YaraTera REXOLIN Mn13

YaraVita MANTRAC PRO

Tomato (field grown): 0.5 to 1 l/ha at the 4 to 6 leaf stage and repeated at 10 to 14 day intervals if required by moderate to severe deficiency. Water rate: 30 to 500 l/ha.

YaraVita TRI-PHOLATE

Tomato: Apply 2 - 4 kg/ha during the growing season through the irrigation water. Alternatively, apply 0.5 kg/ha as a foliar spray. Repeat at 10 to 14 day intervals as necessary, with a maximum of six applications per season. Water rate: 200 l/ha.