Ammonium Sulfate Crystals (21-0-0-24S) represent the classic, highly effective form of this essential dual-nutrient fertilizer. With their fine crystalline structure and exceptional solubility, these crystals deliver immediate nitrogen and sulfur nutrition to crops, making them the preferred choice for rapid deficiency correction, fertigation systems, and foliar applications. For growers seeking quick crop response and maximum nutrient availability, ammonium sulfate crystals provide reliable, cost-effective results.

The Crystalline Advantage

Exceptional Solubility for Rapid Availability

Ammonium sulfate crystals dissolve rapidly and completely in water, with solubility of 750 grams per liter at 20°C. This exceptional solubility ensures that nutrients are immediately available for plant uptake, providing quick correction of nitrogen and sulfur deficiencies. The clear solution is ideal for use in fertigation systems, foliar sprays, and hydroponic applications.

Fine Particle Size for Uniform Application

Our crystalline product features particle sizes ranging from 0.5 to 2.0 mm, providing excellent flowability and uniform distribution when applied dry. The consistent crystal size ensures even coverage when blended with other fertilizers and reliable performance in mechanical spreaders.

High Purity for Sensitive Applications

Manufactured to strict quality standards, our ammonium sulfate crystals contain minimal impurities, making them suitable for sensitive crops and advanced application methods. Low heavy metal content ensures crop safety, while minimal insoluble matter prevents clogging in irrigation systems.

Immediate Nutrient Release

Unlike coated or slow-release fertilizers, ammonium sulfate crystals release nutrients immediately upon contact with soil moisture or water. This rapid availability is particularly valuable during critical growth stages when crops have high nutrient demands.

Core Agronomic Benefits

Dual Nutrient Supply in Plant-Available Forms

Ammonium sulfate crystals deliver 21% nitrogen in the ammonium form and 24% sulfur in the sulfate form. Both nutrients are immediately available for plant uptake, addressing two critical nutritional requirements in a single application. This dual-nutrient package is particularly valuable for crops with high sulfur requirements.

Ammonium Nitrogen Advantages

The ammonium form of nitrogen provides several agronomic benefits. It is immediately available for plant uptake while being held by soil colloids, reducing leaching potential compared to nitrate nitrogen. This combination of immediate availability and soil retention ensures efficient nitrogen utilization. The ammonium form also contributes to the physiological acidity of the fertilizer, which helps lower soil pH in alkaline conditions.

Essential Sulfur Nutrition

Sulfur deficiency is increasingly common in modern agriculture due to reduced atmospheric deposition, higher crop removal rates, and the use of high-analysis fertilizers that contain no sulfur. Ammonium sulfate crystals provide 24% sulfur in the sulfate form, which plants can absorb directly. Sulfur is essential for protein synthesis, enzyme activation, chlorophyll formation, and oil production in crops like canola, soybeans, and sunflowers.

Physiological Acidity for Alkaline Soils

As a physiologically acid fertilizer, ammonium sulfate helps lower soil pH in alkaline and calcareous soils. This acidifying effect improves the availability of phosphorus and micronutrients such as iron, zinc, and manganese, which are often limited in high-pH soils.

Low Volatility for Environmental Stewardship

Compared to urea, ammonium sulfate has significantly lower ammonia volatilization potential, especially when surface-applied or incorporated. This reduced loss means more of the applied nitrogen reaches the crop, improving efficiency and reducing environmental impact.

Application Methods

Fertigation Systems

For drip and sprinkler irrigation systems, dissolve 50 to 100 kg of ammonium sulfate crystals per hectare per application. Prepare solution by adding crystals to water with agitation until completely dissolved. The fully soluble product will not clog emitters or sprinklers when properly prepared. Apply through irrigation systems during crop growth for continuous nutrition.

Foliar Application

For foliar sprays, prepare a 1 to 2% solution (1 to 2 kg per 100 liters of water). Apply during early morning or late afternoon for maximum absorption. Avoid application during hot, sunny conditions to prevent leaf burn. Repeat applications at 10 to 14 day intervals for severe deficiencies. Add a non-ionic surfactant at 0.1% for improved leaf coverage.

Soil Application

For soil application, broadcast 200 to 500 kg per hectare depending on crop requirements and soil test results. Incorporate into the soil within 24 hours of application to minimize nitrogen loss. For banded application, place 5 cm below and beside the seed row for concentrated availability.

Seed Treatment

For seed treatment, prepare a 0.5 to 1.0% solution and soak seeds for 10 to 15 minutes before planting. This provides early nitrogen and sulfur during the critical establishment phase. Air dry seeds before planting.

Hydroponic Systems

For hydroponic nutrient solutions, maintain 50 to 100 ppm nitrogen from ammonium sulfate, balancing with other nitrogen sources to achieve desired nitrate to ammonium ratio. Monitor solution pH regularly as ammonium uptake can lower pH.

Crop-Specific Recommendations

Cereal Crops (Wheat, Barley, Oats)

Apply 200 to 300 kg per hectare pre-plant or at tillering. Sulfur is essential for protein synthesis and grain quality. Expect 10 to 20% yield increase in responsive conditions with improved protein content and test weight.

Corn

Apply 150 to 250 kg per hectare pre-plant or at planting. Band application near the seed row provides early availability. Response is significant in coarse-textured soils and after heavy rainfall.

Canola and Oilseeds

Apply 300 to 400 kg per hectare pre-plant or split between pre-plant and rosette stages. Canola has high sulfur requirements for oil synthesis. Expect 15 to 25% yield increase with improved oil content of 3 to 8%.

Potatoes

Apply 250 to 350 kg per hectare pre-plant or at planting. Sulfur improves tuber quality, specific gravity, and processing characteristics. Expect 15 to 25% yield increase with reduced internal defects.

Onions and Garlic

Apply 200 to 300 kg per hectare pre-plant and at bulb initiation. Sulfur enhances pungency, flavor compounds, and storage quality. Expect 10 to 20% yield increase with improved marketable grade.

Leafy Vegetables

Apply 100 to 200 kg per hectare pre-plant and as side-dressing. Nitrogen promotes vigorous leaf growth while sulfur enhances color and nutritional value. Expect deeper green color and improved shelf life.

Fruit Trees

Apply 0.5 to 1.5 kg per tree depending on tree size and age. Apply in early spring before bud break. Sulfur contributes to fruit quality and reduces physiological disorders.

Forage and Pasture

Apply 150 to 250 kg per hectare after each cutting or grazing. Sulfur improves protein content and palatability. Expect 15 to 25% dry matter yield increase with improved forage quality.

Deficiency Recognition and Correction

Nitrogen Deficiency Symptoms

Nitrogen deficiency appears as uniform yellowing of older leaves, stunted growth, and reduced tillering. Plants may appear pale green overall. In cereals, heads may be small with poor grain fill. Rapid response to ammonium sulfate application occurs within 5 to 7 days with visible greening.

Sulfur Deficiency Symptoms

Sulfur deficiency appears as yellowing of younger leaves, unlike nitrogen deficiency which affects older leaves first. Plants may be stunted with reduced growth. In canola, leaves may cup upward and develop purpling. In onions, bulbs may be small with poor storage quality. Rapid response occurs with sulfate-sulfur application.

Combined Deficiency

When both nitrogen and sulfur are deficient, plants show general chlorosis, stunted growth, and poor yield. Ammonium sulfate provides both nutrients in a single application for efficient correction.

Technical Specifications

Chemical Composition

Total nitrogen: 21.0% minimum (ammonium form)
Sulfur: 24.0% minimum (sulfate form)
Free acidity: 0.05% maximum
Moisture: 0.5% maximum

Physical Properties

Crystal size: 0.5 to 2.0 mm
Bulk density: 1000 to 1100 kg per cubic meter
Solubility: 750 grams per liter at 20°C
pH of 1% solution: 5.0 to 6.0
Hygroscopicity: Moderate, store in dry conditions

Quality Standards

Purity: 99.5% minimum
Heavy metals: Cadmium ≤1 ppm, Lead ≤5 ppm, Arsenic ≤1 ppm
Insoluble matter: ≤0.05%
Color: White to off-white crystals

Environmental and Safety Considerations

Soil Health

When used at recommended rates, ammonium sulfate does not contribute to long-term soil acidification beyond what is typical for ammonium-based fertilizers. Regular soil testing and pH monitoring are recommended to manage soil acidity.

Water Quality

The ammonium form is held by soil colloids, reducing leaching potential compared to nitrate fertilizers. Proper timing and rate management minimize environmental impact. Avoid application on frozen, waterlogged, or saturated soils.

Storage and Handling

Store in original containers in a cool, dry, well-ventilated area. Protect from moisture to prevent caking. Keep away from strong oxidizing agents and incompatible materials. Shelf life is 24 months under proper storage conditions.

Personal Protection

Use appropriate personal protective equipment during handling including chemical-resistant gloves, safety glasses or goggles, and dust mask when mixing large quantities. Wash hands thoroughly after handling. In case of eye contact, flush with water for 15 minutes and seek medical attention if irritation persists.

Quality Assurance

Our ammonium sulfate crystals are manufactured under strict quality control procedures. ISO 9001:2015 certification ensures consistent product quality. ISO 14001:2015 certification demonstrates environmental responsibility. Batch-to-batch uniformity guarantees predictable performance. Complete traceability from production to delivery provides supply chain security.

Why Choose Ammonium Sulfate Crystals

Rapid Crop Response

The high solubility and immediate nutrient availability ensure quick correction of nitrogen and sulfur deficiencies. Visible greening often occurs within 5 to 7 days of application, providing confidence that the product is working.

Application Versatility

Ammonium sulfate crystals are suitable for all application methods including soil broadcast, banding, fertigation, foliar spray, seed treatment, and hydroponic systems. This versatility allows growers to use the same product for multiple purposes throughout the growing season.

Economic Value

The high nutrient concentration of 21% nitrogen and 24% sulfur provides excellent value per unit of active ingredient. The dual-nutrient formulation eliminates the need for separate sulfur applications, reducing fertilizer costs and simplifying fertility programs.

Crop Safety

The low salt index of ammonium sulfate reduces the risk of seed damage when used in starter fertilizers. The absence of chloride and other harmful elements makes it safe for sensitive crops. The product is suitable for use in organic production systems when sourced from approved sources.

Technical Support and Ordering

Product Availability

Ammonium sulfate crystals are available in 25 kg bags, 50 kg bags, and 1-ton bulk bags. Custom packaging options are available for specific requirements. Bulk shipments are available in container loads for large-scale operations.

Technical Services

Soil test interpretation and application rate recommendations are provided. Deficiency diagnosis assistance is available. Fertigation and foliar application guidance is offered. Economic analysis of investment returns is provided. Custom crop-specific fertility programs are developed.