Zinc discussed on TalkApple in earlier posts??????

Zinc is a secondary/macro nutrient in apple, required in very small quantities. However low levels of zinc may certainly effect apple yield.

It is very important as it plays role in several plant enzyme activation

Zinc directly relates with auxin secretion (IAA) which is directly involved in shoot elongation

Heavy Nitrogen and Phosphorus levels can reduce zinc uptake to the trees.

In zinc deficiency shoots have small internodes.

Little nd bunch of leaves with small internodes are main symptoms of zinc deficiency

Zinc helps in bud development and can be applied foliar even in dormancy, by applying zinc sulphate @1-2 kg per drum

High carbon soils or alkaline soils may cause zinc deficiency.

Also it's immobile within the plant

Zinc deficiency may result in poor health of spurs

Basal application of mycorhyzae has been found effective in zinc uptake

Poor zinc supply may reduce the size of basal leaves of the buds which result in small sized fruit

Zinc sulphate spray should be avoided in summers as it can damage the foliage due to its caustic action

In severe deficiency zinc sulphate can also be mixed with oil nd can be sprayed in dormancy

You can mix zinc sulphate but should be done in Dormancy , January February

If it's done at foliage it's caustic action Burns the foliage