Deficiency of micronutrients in onion plants: symptoms, causes, and control

Lack of micronutrients in onion plants is one of the reasons that leads to poor growth and reduced productivity. This article from the “WORLD OF PLANTS” website provides an analysis of the symptoms of this deficiency and how to compensate for the missing elements.

Lack of micro-nutrients in the onion plant

1. Iron deficiency

2. Zinc deficiency

the reasons	Symptoms	treatment
Zinc deficiency Young plants are particularly sensitive to zinc deficiency. Deficiency is most common in soils with a high pH or calcareous soil rich in phosphorus during cool, wet weather, as zinc aids in photosynthesis and improves seed germination and fruit yield.	Zinc-deficient plants are stunted and their leaves are twisted and curved outward	Use fertilizer rich in zinc and apply it directly into the soil.

3. Copper deficiency

the reasons	Symptoms	treatment
Copper deficiency increases in organic, sandy, and nitrogen-rich soils, as copper is important for the growth of onion skin and helps in the photosynthesis process.	The tips of the leaves turn white and twist to resemble a corkscrew or bend at right angles. You may die again.	Apply copper directly to the soil or spray foliarly.

4. Copper deficiency

the reasons	Symptoms	treatment
The disease is prevalent in alkaline and sandy soils because it is easily leached, and high levels of calcium and nitrogen can reduce boron uptake in cool, wet weather, which helps improve yield and storage quality of fruit.	Boron-deficient onion leaves turn dark green and brittle and can be stunted or misshapen.	To maintain the correct balance of calcium and nitrogen, boron can be applied directly to the soil.

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Sources

Onion nutrient deficiencies – Yara UK Ltd