High Zinc Content: Contains a high concentration of zinc (typically 33-36% Zn), making it an efficient source for correcting deficiencies.
Sulphate Formulation: The sulphate (SO₄²⁻) component enhances the mobility and availability of zinc in the soil and within the plant.
Excellent Water Solubility: Dissolves completely in water, allowing for versatile application methods, including fertigation and foliar spraying.
Quick Correction: Provides zinc in a form that plants can absorb immediately, leading to rapid recovery from deficiency symptoms.
Cost-Effective: Offers one of the most economical ways to supply zinc to crops on a large scale.
2.Primary Functions and Benefits
| Function | Benefit to Plants | Agronomic Advantage |
| Enzyme Activation | Zinc is a cofactor for over 300 enzymes involved in metabolic processes. | Essential for carbohydrate metabolism, protein synthesis, and growth regulation. |
| Auxin Synthesis | Critical for the production of auxin (IAA), a key plant hormone that controls cell elongation and division. | Promotes normal shoot and root development, preventing the stunted growth characteristic of zinc deficiency. |
| Chlorophyll Production | Plays a role in chlorophyll formation and chloroplast development. | Maintains healthy, green foliage and maximizes photosynthetic efficiency. |
| Stress Tolerance | Enhances plant resilience to environmental stresses such as heat, drought, and disease. | Reduces crop losses under adverse conditions. |
3. Target Crops and Application Scenarios
Zinc-Deficient Soils: Soils that are sandy, calcareous (high pH), low in organic matter, or have high phosphorus levels are prone to zinc deficiency.
Highly Sensitive Crops: Rice, corn, soybeans, citrus, grapes, and pecans are particularly susceptible to zinc deficiency and show strong yield responses to zinc fertilization.
Application Timing: Best applied at planting (as a basal dose) or during the early growth stages to prevent deficiency. Foliar sprays can be used for quick correction when symptoms appear.
4. Application Guidelines (General)
Soil Application:
Broadcast: Apply 5-15 kg per hectare and incorporate into the soil before planting.
Band Application: Apply 2-5 kg per hectare in bands near the seed for greater efficiency.
Foliar Spray:
Dilution: Dissolve 1-2 kg of Zinc Sulphate Monohydrate in 1000 liters of water.
Spray: Apply evenly on leaves, 2-3 times during the growing season, especially during the early stages of growth.
Seed Treatment: A low concentration solution can be used to coat seeds before sowing, ensuring early availability of zinc to the seedling.
Precautions: Avoid mixing with concentrated alkaline solutions (e.g., some pesticides) as it may cause precipitation. Do not over-apply, as excessive zinc can be toxic to plants and may interfere with the uptake of other nutrients like phosphorus and copper.
5.Product Specifications (Typical)
| Parameter | Specification |
| Chemical Formula | ZnSO₄·H₂O |
| Zinc (Zn) Content | 33% - 36% |
| Sulphur (S) Content | 15% - 18% |
| Appearance | White crystalline powder |
| Water Solubility | Highly soluble in water |
6.Zinc Deficiency Symptoms
Stunted Growth: Plants are shorter than normal with shortened internodes.
Leaf Symptoms: Interveinal chlorosis (yellowing between the veins) on younger leaves; small, narrow leaves ("little leaf" syndrome).
Rosetting: Leaves clustered at the ends of stems due to shortened internodes.
Reduced Yield: Poor fruit set, smaller fruits, and significantly lower grain yields.
Note: Zinc Sulphate Monohydrate is the most widely used zinc fertilizer due to its high effectiveness, solubility, and cost-efficiency. For soils with extremely high pH (alkaline soils), chelated zinc may be more effective, but Zinc Sulphate remains the standard choice for most agricultural applications. It is a fundamental tool for ensuring optimal crop nutrition and maximizing yields in zinc-deficient soils.