Symptoms
Symptoms of Zn deficiency start on younger leaves. They become very narrow, and the internode growth is inhibited, producing a rosette-like appearance for the whole plant ('little-leaf').
Furthermore, the leaves show chlorotic to necrotic spots and are ruffled.
Reasons
Zinc deficiency
Manganese deficiency also starts with mottled chlorosis on the leaves, but leaf shape is normal and the plant growth is not stunted.
Tobacco - Growth retardation
Symptoms
Symptoms of Zn deficiency start on younger leaves. They become very narrow, and the internode growth is inhibited, producing a rosette-like appearance for the whole plant ('little-leaf'). Furthermore, the leaves usually show chlorotic to necrotic spots and are ruffled.
The presented picture shows growth reduction only .
Reasons
Zinc deficiency
Manganese deficiency also starts with mottled chlorosis on the leaves, but leaf shape is normal and the plant growth is not stunted.
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
Required in a large number of enzymes and plays an essential role in DNA transcription
Involved in auxin (plant hormone) metabolism
Increases dry matter yield
Yara recommended fertilizers for Zinc
YaraVita ZINTRAC 700
Tobacco: 1 l/ha at 3 to 4 leaf stage. Repeat 10 days later if necessary. Water rate: minimum 30 l/ha.