Potassium sulfate

Potassium sulfate

Potassium sulfate

Potassium sulfate (SOP)

Product Name:Sulfate of Potash, SOP
Category:Potassium Fertilizer
Chemical Formula:K₂SO₄
Potassium (K₂O):50.0–53.0%
Sulfur (as S):18.0–19.0%
Appearance:White to off-white granules or fine crystalline powder
Specification:50kg per bag or customized
Payment Terms:T/T, L/C, cash(USD, EUR, RMB)
Certificate:ISO 22241-1, ISO 9001 standard.

Potassium sulfate (SOP) Description

Risso Potassium Sulfate (K₂SO₄), also known as Sulfate of Potash (SOP), is a high-purity, chloride-free fertilizer that supplies two essential plant nutrients: potassium (K) and sulfur (S). With its low salt index, high water solubility, and exceptional compatibility with sensitive crops, Risso SOP is the preferred potassium source for growers targeting premium yield and quality in fruit, vegetable, and specialty crop production.

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Risso SOP Key Benefits

  • High Potassium Content (50–53% K₂O)
    Promotes flowering, fruit sizing, sugar accumulation, and overall crop vigor.

  • Available Sulfur (18–19% S)
    Essential for protein formation, enzyme activity, and enhancing flavor and shelf life.

  • Chloride-Free Formula
    Specifically formulated for chloride-sensitive crops such as grapes, potatoes, citrus, leafy vegetables, and tobacco.

  • Low Salt Index (~0.85)
    Safe for fertigation, hydroponics, and saline soils. Reduces risk of root burn and salt buildup.

  • Fully Water-Soluble Grades Available
    Ideal for use in drip irrigation systems, greenhouse production, and foliar applications.

  • Certified for Organic Agriculture
    Risso SOP is available in OMRI- and CDFA-listed grades for use in organic farming systems.

Risso SOP Technical Specifications

Parameter Typical Value
Brand Name Risso
Product Name Potassium Sulfate (Sulfate of Potash, SOP)
Chemical Formula K₂SO₄
Potassium (K₂O) 50.0–53.0%
Sulfur (S) 18.0–19.0%
Chloride (Cl⁻) ≤ 0.5% (low-chloride grades ≤ 0.05%)
Moisture Content ≤ 0.5%
pH (5% solution) 7.0–9.0 (neutral to slightly alkaline)
Solubility in Water 110 g/L at 20 °C
Salt Index ~0.85
Appearance White to off-white granules or fine crystalline powder
Particle Size Granular (SGN 240–320), fine powder, or water-soluble

Application Guidelines

Crop Type Recommended Rate Application Method
Orchards (Citrus, Mango) 200–400 kg/ha Broadcast or fertigation
Vegetables (Tomato, Lettuce) 150–250 kg/ha Drip irrigation or top dress
Vineyards, Berries 130–400 kg/ha Surface or fertigated
Potatoes, Tobacco 180–350 kg/ha Pre-plant or split apply
Turfgrass, Ornamentals 5–10 g/m² Granular or foliar spray
Greenhouse Crops 1–2 g/L solution Fertigation / hydroponics
📌 Always base fertilizer use on recent soil and tissue analysis to maximize efficiency and crop response.

Risso Potassium Sulfate is particularly suited for:

  • Fruits: grapes, apples, strawberries, melons, bananas

  • Vegetables: leafy greens, tomatoes, peppers, carrots

  • Tubers: potatoes, sweet potatoes

  • Tobacco and tea crops

  • Nuts and citrus trees

  • Turfgrass and ornamental plants

  1. Storage: Store in a cool, dry, well-ventilated area, away from rain and humidity.

  2. Transportation: Handle carefully to avoid damage. Do not mix or transport with toxic substances.

  3. Packaging: Minor moisture or slight heating at the bag opening is normal and does not affect the product’s effectiveness.

  4. Production Date: Clearly indicated on the certificate of conformity or packaging.

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    How to Choose the Right Potassium Sulfate (SOP)

    1. Check Crop Sensitivity
      Choose SOP if your crops are chloride-sensitive (e.g., grapes, potatoes, leafy greens).

    2. Consider Purity
      Look for low-chloride content (≤0.5%) and high K₂O (≥50%) for best results.

    3. Select the Right Grade
      Use granular SOP for soil application and water-soluble SOP for fertigation or foliar spray.

    4. Match Application Method
      SOP is ideal for drip irrigation, greenhouse use, and saline soils due to its low salt index.

    5. Check for Certifications
      For organic farming, choose SOP with OMRI or CDFA certification.

    👉 Choose Risso SOP for premium quality, high purity, and optimal crop performance.