Zinc deficiency-Wheat | Yara South Africa

Symptoms
Affected plants are paler in colour than normal and the leaves have a purplish tint. Necrotic spots (often light brown with dark margin) occur on the older leaves. Growth is also reduced due the affect of zinc on chlorophyll function. Internodes are shortened.

Reasons
Zinc deficiency

Cereals - Chlorosis

Symptoms
Medium leaves show interveinal chlorosis.

Reasons
Zinc deficiency on durum wheat

Zinc deficiency made worse by

Organic soils
High pH soils
Soils rich in phosphorus
Soils receiving high phosphorus application
Cold wet conditions

Zinc is important for

Increased fertility (number of grains per ear)
Better grain quality

Yara recommended fertilizers for Zinc

YaraVita MANCOZIN

Cereals: 0.5 to 1 l/ha from 2 leaf stage to first node detectable (Craven 1 - 10/11). Water rate: 200 l/ha. For severe deficiency, increase to 2 l/ha or repeat the above dose 10 to 14 days later.

YaraVita TEPROSYN BIO

Cereals: 2 l/ha at the 4 to 6 leaf stage (Zadoks G.S. 14 to 16). Alternatively: 1 to 2 l/ha from 2 leaf stage to first node detectable (Zadok's G.S 12 to 31), repeated once or twice at 10 to 14 day intervals in cases of moderate to severe deficiency, within this timing. Water rate: 200 l/ha. Seed Dressing: 3-6 litres per ton.

YaraVita TRI-PHOLATE

Cereals: 3 kg/ha from 4 leaf stage to 1st node detectable (Craven 4 - 10/11). Repeat within this timing at an interval of not less than 10 days, if necessary. Water rate: Tractor driven sprayer: 200 l/ha Application through irrigation system: 100,000 l/ha.

YaraVita ZINTRAC 700

Cereals: 0.5 to 1 l/ha from 2 leaf stage to first node detectable (Craven 9 - 10/11), repeated once or twice at 10 to 14 day intervals in cases of moderate to severe deficiency. Water rate: 50 to 200 l/ha.