Zinc (Zn) is an essential micronutrient but Zinc deficiency appears to be the most widespread and frequent micronutrient deficiency problem in crops worldwide particularly in countries such as India, China, Pakistan and Turkey where soils are low in available Zn, and cereals are the major source of calorie intake. It is, therefore, highly important to develop cost-effective and quick solutions to the Zn deficiency problem.
Zinc deficiency is common on many soil types including calcareous, heavy clay, alluvial, sandy soils and peats. It is especially common on soils low in organic matter and of high pH. Availability of zinc may be reduced by water logging and where root growth is restricted. Cool wet weather, low light intensity or high soil nitrogen, phosphorus or copper may intensify the deficiency.
Citrus trees suffering from a zinc deficiency show yellowing between the leaf veins, rolling of the margins and smaller leaves than normal. Zinc becomes unavailable in soils which have high pH.
It’s such a common question, “What’s wrong with my lemon tree?”. Well, a little detective work can give you a quick idea of what your citrus may be lacking.
image shows Zinc deficiency indicated by the mottling chlorosis and small leaf size in Lemon plant.
A yellowing of newly produced leaves. They may be mottled and are smaller than usual. Interveinal chlorosis occurs in moderate cases and in more severe cases the veins turn yellow, especially near the tip. Leaves may start to die and brown off at the tips and twigs may die back. Solution is use Zinc sulphate for this problem