Ammonium Sulfate Powder (21-0-0-24S) is the ultimate form of this essential dual-nutrient fertilizer when speed of dissolution and complete solubility are required. Our fine powder grade dissolves almost instantly in water, producing a clear, sediment‑free solution that is ideal for foliar sprays, fertigation, liquid fertilizer blends, and hydroponic systems. For growers and formulators who need immediate nutrient availability without clogging nozzles or emitters, ammonium sulfate powder delivers unmatched performance.

I. Why Powder Form Matters

Instant Solubility
Unlike granular or crystalline forms that may take minutes to fully dissolve, our ammonium sulfate powder (particle size <0.2 mm) disperses and dissolves within seconds in cold water. This allows for rapid preparation of stock solutions and eliminates the need for prolonged agitation or pre‑mixing.

Perfect for Liquid Fertilizers
As a raw material for liquid NPK or nitrogen‑sulfur blends, the powder form mixes homogeneously with other soluble ingredients (urea, potassium nitrate, MKP, etc.), resulting in a stable, uniform final product. No settling or sediment in storage tanks.

Foliar Application Ready
The fine powder dissolves completely without leaving residues on leaves or in spray tanks. When used in foliar programs, it provides immediate nitrogen and sulfur uptake through leaf surfaces, correcting deficiencies within days.

Clog‑Free Fertigation
For drip and sprinkler irrigation, the completely soluble powder leaves no undissolved particles that could block emitters, filters, or fine nozzles. This ensures reliable system operation even with high‑frequency injection.

II. Core Agronomic Benefits

Dual Nutrient Supply – Nitrogen + Sulfur
Ammonium sulfate powder delivers 21% nitrogen in the ammonium form (held by soil colloids, less prone to leaching) and 24% sulfur as sulfate (immediately available for plant uptake). This combination is essential for high‑sulfur crops (canola, onions, crucifers, forages) and for correcting sulfur deficiency in any crop.

Rapid Plant Response
Because both nutrients are in fully soluble, plant‑available forms, visible greening and growth improvement often occur within 5–7 days of application. This makes the powder ideal for mid‑season corrections and high‑value production systems.

Chloride‑Free and Low Salt Index
Ammonium sulfate contains no chloride, making it safe for chloride‑sensitive crops (tobacco, potatoes, berries, citrus). Its low salt index allows high‑concentration solutions without root or leaf burn.

Physiological Acidity for Alkaline Soils
When applied to soil, ammonium sulfate has an acidifying effect, helping to lower pH in calcareous and alkaline soils. This releases locked‑up phosphorus and micronutrients, improving overall fertility.

Low Volatilization
Compared to urea, ammonium sulfate has minimal ammonia volatilization, even when surface‑applied. More of the applied nitrogen stays in the soil or solution for crop uptake.

III. Application Methods and Rates

Foliar Spray (Rapid Deficiency Correction)

• Concentration: 1–2% solution (1–2 kg per 100 L water). Do not exceed 2% to avoid leaf burn.
• Spray volume: 300–500 L per hectare.
• Timing: Apply at early vegetative stages, before flowering, or at first signs of sulfur deficiency (yellow young leaves).
• Frequency: 2–3 applications at 10–14 day intervals.
• Additive: Use a non‑ionic surfactant (0.1%) for better leaf coverage.
• Response: Greening visible within 5–7 days; sulfur deficiency symptoms disappear.

Fertigation (Drip and Sprinkler)

• Rate: 50–100 kg per hectare per application.
• Concentration: 5–15 g per liter of irrigation water.
• Frequency: Weekly or bi‑weekly during active growth.
• Method: Dissolve powder in a small volume of water, then inject into main irrigation line. Ensure thorough mixing before injection.
• Compatibility: Can be mixed with most water‑soluble fertilizers (KNO₃, MKP, MgSO₄), but avoid mixing with calcium or alkaline materials in concentrated stock tanks.

Liquid Fertilizer Formulation

• Use ammonium sulfate powder as a source of N and S in custom liquid blends.
• Typical formulation: dissolve 200–300 kg powder in 1000 L water, adjust pH to 6–7 if needed.
• Add stabilizers for long‑term storage. Final solution analysis: approximately 4–6% N, 5–7% S.

Hydroponic Nutrient Solutions

• Target: 50–100 ppm N from ammonium sulfate (blended with nitrate sources).
• Adjustment: Dissolve powder in warm water before adding to reservoir.
• Caution: High levels of ammonium may be toxic in recirculating systems; use as part of a balanced formula with adequate nitrate.

Soil Application (as a Solution or Drench)

• Rate: 200–400 kg powder dissolved in 500–1000 L water per hectare.
• Timing: Pre‑plant or as a side‑dress.
• Application: Pour or inject the solution into the root zone. Follow with light irrigation.

Seed Treatment (for early nutrition)

• Concentration: 0.5–1.0% solution.
• Method: Soak seeds for 10–15 minutes before planting.
• Benefit: Provides early N and S for seedling establishment.

IV. Technical Specifications (Fine Powder Grade)

Chemical Properties

• Formula: (NH₄)₂SO₄
• Total nitrogen (N): 21.0% minimum (ammonical)
• Sulfur (S): 24.0% minimum (as SO₄)
• Free acid (H₂SO₄): ≤ 0.05%
• Moisture: ≤ 0.5%

Physical Properties

• Appearance: White to off‑white, fine free‑flowing powder
• Particle size: 100% passing through 0.2 mm mesh (typical D90 = 100–150 µm)
• Bulk density: 950–1050 kg/m³
• Solubility: 750 g/L at 20°C (complete dissolution)
• pH of 1% solution: 5.0–6.0
• Dust content: moderate – handle with care.

Quality Standards

• Purity: ≥ 99.5%
• Heavy metals: Cd ≤ 1 ppm, Pb ≤ 5 ppm, As ≤ 1 ppm
• Chloride (Cl): ≤ 0.01%
• Insoluble matter: ≤ 0.05%

V. Crop‑Specific Recommendations Using Powder Form

Cereals (Wheat, Barley, Corn)

• Foliar spray: 1% solution at tillering and boot stages increases grain protein and test weight.
• Fertigation: 50–80 kg/ha through drip at early stem elongation.
• Result: 10–20% yield increase in sulfur‑deficient soils.

Canola and Oilseeds

• Foliar: 1.5% solution at rosette and early flowering (sulfur demand peaks before flowering).
• Fertigation: 60–100 kg/ha weekly during stem elongation.
• Result: 15–25% yield increase, 3–6% higher oil content.

Potatoes

• Foliar: 1% at tuber initiation and bulking.
• Fertigation: 50–80 kg/ha via drip.
• Result: Improved specific gravity, reduced hollow heart, better processing quality.

Onions and Garlic

• Foliar: 1% solution at bulb initiation and again 2 weeks later.
• Fertigation: 40–60 kg/ha per application.
• Result: Larger bulbs, stronger pungency, longer storage life.

Vegetables (Tomato, Pepper, Cucumber)

• Foliar: 0.5–1% every 10–14 days from transplanting to harvest.
• Fertigation: 30–50 kg/ha weekly.
• Result: Deep green leaves, improved fruit set, higher marketable yield.

Turf and Ornamentals

• Liquid spray: 5–10 kg powder per 1000 m² dissolved in 200 L water.
• Frequency: Monthly during growing season.
• Result: Rapid greening, dense turf, no burn when watered in.

VI. Compatibility and Tank Mixing

Compatible with

• Water (any temperature)
• Potassium nitrate (KNO₃)
• Mono‑potassium phosphate (MKP)
• Magnesium sulfate (MgSO₄)
• Most micronutrient chelates (Fe, Zn, Mn, Cu, B)
• Non‑ionic surfactants
• Most pesticides (jar test recommended)

Incompatible with

• Calcium nitrate (Ca(NO₃)₂) – forms calcium sulfate precipitate.
• Concentrated alkaline materials (lime, copper hydroxide, Bordeaux mixture).
• In concentrated stock tanks, avoid mixing with phosphates if water contains calcium.

Tank Mix Order (for foliar spray)

1. Fill tank with ½ of final water volume.
2. Add ammonium sulfate powder, stir until dissolved.
3. Add other water‑soluble fertilizers (if any).
4. Add non‑ionic surfactant.
5. Make up to final volume with water.
6. Apply within 24 hours.

VII. Environmental and Safety Profile

Soil and Water
Ammonium sulfate is not persistent; the nitrogen and sulfur are taken up by plants or become part of the soil organic cycle. Leaching is limited because ammonium is positively charged and held by soil colloids. Over‑application can cause soil acidification; periodic pH monitoring is recommended.

Worker Safety
Ammonium sulfate powder may cause mild eye or respiratory irritation from dust. Wear safety glasses, a dust mask, and gloves when handling large volumes. Work in a well‑ventilated area. In case of eye contact, flush with water for 15 minutes. If ingested, drink water and seek medical advice.

Storage
Store in original sealed bags in a cool, dry, well‑ventilated area, away from moisture and alkaline materials. Keep bags off concrete floors (use pallets). Shelf life: 24 months.

VIII. Quality Assurance and Certifications

Our ammonium sulfate powder is produced in ISO 9001:2015 and ISO 14001:2015 certified facilities. Each batch is tested for N content, S content, moisture, particle size, heavy metals, and solubility. Certificates of Analysis accompany every shipment.

IX. Why Choose Our Ammonium Sulfate Powder

• Instant solubility – Dissolves completely in seconds, no sediment.
• Ultra‑fine particle size – Uniform powder for consistent blending and dissolution.
• High purity – Low heavy metals, low chloride, safe for sensitive crops and hydroponics.
• Technical support – Our agronomists provide foliar program design, fertigation schedules, and tank mix compatibility advice.
• Flexible packaging – 25 kg moisture‑proof bags, 1‑ton FIBCs, bulk containers.