Zinc Sulphate Uses in Agriculture: A Complete Guide
Published on: 2026-05-05 | Author: Neeraj Kedia, Managing Director | Read time: 6 min read
Zinc is one of the most essential micronutrients for plant growth. Zinc Sulphate, particularly in its Monohydrate and Heptahydrate forms, plays a critical role in modern agriculture by addressing zinc deficiency in soils, a widespread issue affecting crop productivity across India.
Why Zinc Matters for Crops
Zinc is required for the synthesis of proteins, enzymes, and growth hormones in plants. A deficiency in zinc leads to stunted growth, delayed maturity, poor grain quality, and significantly reduced yields. According to the Indian Institute of Soil Science, nearly 50% of Indian soils are zinc-deficient.
How Zinc Sulphate Is Applied
- Soil Application: 20 to 25 kg of Zinc Sulphate Monohydrate per hectare, mixed with soil before sowing.
- Foliar Spray: 0.5% Zinc Sulphate solution sprayed on leaves during the vegetative growth stage.
- Seed Treatment: Seeds are soaked in Zinc Sulphate solution before planting to ensure early zinc availability.
Crops That Benefit Most
Rice, wheat, maize, cotton, sugarcane, citrus fruits, and pulses are among the crops that respond most positively to zinc supplementation. In rice cultivation alone, zinc application can increase yields by 15 to 20%.
Monohydrate vs Heptahydrate: Which to Use?
Zinc Sulphate Monohydrate (33% Zn) is preferred for soil application due to its higher zinc content per unit weight and lower moisture. Zinc Sulphate Heptahydrate (21% Zn) dissolves faster and is ideal for foliar sprays and fertigation systems.
Chakradhar's Agricultural-Grade Zinc Sulphate
How much Zinc Sulphate should you apply?
| Method | Rate | When to apply |
|---|---|---|
| Soil application | 20 to 25 kg of Zinc Sulphate Monohydrate per hectare | Mixed with soil before sowing, as a basal dose |
| Foliar spray | 0.5% Zinc Sulphate solution | During the vegetative growth stage |
| Seed treatment | Seeds soaked in Zinc Sulphate solution | Before planting, for early zinc availability |
The exact rate depends on your soil test result and local agronomy guidance, so treat these figures as a general guide and confirm the rate for your field and crop before large-scale application.
Which grade and form should you choose?
Zinc Sulphate Monohydrate is manufactured in three forms. Fine powder blends readily into dry fertiliser mixes, coarse powder resists dust and caking, and the granular form is ideal for uniform basal spreading and mechanical application. The 33% grade suits general agricultural use, while the 35.5% grade offers a higher zinc concentration for technical and demanding applications. For foliar sprays and fertigation, Zinc Sulphate Heptahydrate at 21% or 22% zinc dissolves quickly and is easier to spray. Choosing the right grade and form keeps application uniform and reduces the material needed to correct a deficiency.
Quality and documentation you can rely on
Every shipment from Chakradhar Chemicals is supported by a certificate of analysis, a safety data sheet and a technical data sheet, so your quality and procurement teams have the specifications they need before and after purchase. Production runs under an ISO 9001:2015 certified quality system at our Muzaffarnagar plant, with bulk and container-load supply available for domestic and export orders.
At Chakradhar Chemicals, we manufacture high-purity Zinc Sulphate Monohydrate in powder, coarse, and granulated forms, all meeting stringent quality standards. With a production capacity of 30,000+ MTPA, we are one of India's largest and most trusted suppliers to the agricultural sector.