What Makes Zinc Sulfate Heptahydrate a Go-To Solution for Zinc Deficiency in Crops?

Technical Introduction

Zinc Sulfate Heptahydrate (ZnSO₄·7H₂O) is a fully water-soluble inorganic salt containing 21–22% zinc and ~11% sulfur in a crystalline hydrated form.
It is widely used in agriculture to correct zinc deficiencies in soil and plants, supporting enzyme activation, protein synthesis, chlorophyll formation, and carbohydrate metabolism.
Its heptahydrate form dissolves rapidly in water, making it ideal for foliar sprays, fertigation, and soil application.

Applications

1. Agriculture & Horticulture

• Foliar Nutrition: Corrects zinc deficiency quickly in cereals, fruits, vegetables, and cash crops.

• Soil Application: Improves zinc availability in alkaline and calcareous soils.

• Seed Treatment: Enhances germination, seedling vigor, and root growth.

2. Animal Nutrition

• Added as a trace mineral supplement in feed to prevent zinc-related disorders in livestock and poultry.

3. Industrial Uses

• Electroplating: Used as a zinc salt source.

• Water Treatment: Acts as a coagulation aid.

• Manufacturing: Ingredient in pigments, rayon, and other products.

Advantages

• Rapid Solubility: Dissolves completely for quick uptake in plants.

• Dual Nutrient Supply: Provides both zinc and sulfur for crop health.

• Cost-Effective: Affordable and widely available.

• Versatile Application: Works in soil, foliar, and fertigation systems.

Typical Parameters(Agricultural Grade)

FAQs

Q1: Why choose heptahydrate over monohydrate zinc sulphate?
A1: Heptahydrate dissolves faster and is often easier to handle, though it contains less zinc per unit weight.

Q2: Can it be mixed with other fertilizers?
A2: Yes, but avoid mixing with phosphates in liquid form to prevent precipitation.

Q3: How often should it be applied to crops?
A3: Usually once or twice per growing season, depending on deficiency severity and crop type.

Q4: Is it safe for foliar spraying?
A4: Yes, when diluted to recommended concentrations (often 0.2–0.5% solution).

Q5: Can it be used in organic farming?
A5: It is allowed in some organic systems, but certification rules vary by country.