Sulfate of Potash (SOP) is a potassium-rich fertilizer that helps turfgrass withstand stress, improves disease resistance, and promotes robust root systems. This guide reviews five top SOP products ideal for American lawns, balancing quick nutrient availability with long-lasting results. Each option offers granular or easily managed formulations designed for outdoor use, with varying bag sizes to fit different lawn sizes and maintenance schedules.
| Product | Brand | Size | Notes |
|---|---|---|---|
| Southern Ag Sulfate of Potash 0-0-50 | Root 98 Warehouse | 5 lb | Strengthens turf, corrects potassium deficiency |
| Supply Solutions | 0-0-50 Plus 17% Sulfur Golden K-Max | Supply Solutions | 10 lb | Balanced 17-18-18 style nutrients with SOP |
| Supply Solutions 0-0-50 Plus 17% Sulfur | Supply Solutions | 40 lb | Similar balance, larger bag for lawns |
| Supply Solutions Sulfate of Potash 0-0-50 Plant Fertilizer | Supply Solutions | 50 lb | Ultra-fine, rapid absorption for quick uptake |
| 0-0-50 Plus 17% Sulfur Golden K-Max (5 lb) | Supply Solutions | 5 lb | Compact option with similar nutrient profile |
Note: This selection focuses on sulfate-of-potassium products with a 0-0-50 or similar potassium emphasis, appropriate for turf and ornamental applications. All items are granular or powder formulations designed for soil incorporation and root uptake. Always follow label directions for application rates and compatibility with existing lawn care programs.
Southern Ag Sulfate of Potash 0-0-50
Product from Root 98 Warehouse provides a granular 0-0-50 formulation designed to strengthen turfgrass and ornamental plants against disease and adverse conditions such as winter. The fertilizer corrects potassium deficiencies in turfgrass, woody ornamental plants, vegetables, and flowers. It contains granular-grade potassium sulfate and is not intended for spraying. This SOP product is suitable for broadcast application to lawns and beds, supporting overall plant resilience and drought tolerance when used as part of a balanced care plan.
Supply Solutions 0-0-50 Plus 17% Sulfur Golden K-Max
This 10-pound bag delivers a complete nutrition blend with 17-18-18-style balance alongside SOP. It provides essential micros (boron, manganese, zinc) and humic acid support to improve nutrient use efficiency. Ideal for lawns, vegetable beds, borders, shrubs, and trees, it’s suitable for spring and fall feeding, soil prep, and ongoing growth. The powdery formula is easy to broadcast, and after application, watering helps move nutrients into the root zone. Use with irrigation to avoid drought-stress periods.
Supply Solutions 0-0-50 Plus 17% Sulfur (40 Pounds)
A large-format SOP option with a balanced 17-18-18 fertilizer profile, enhanced by sulfur and essential trace minerals. It is designed for lawns, gardens, and outdoor plants, supporting spring and fall feeding, soil preparation, and ongoing nutrition during active growth. The powder formula simplifies measuring and broadcasting; follow with ample watering to ensure nutrient movement into the root zone and avoid fertilizing during drought without sufficient irrigation.
Supply Solutions Sulfate Of Potash 0-0-50 Plant Fertilizer
This ultra-fine, highly soluble SOP fertilizer promotes rapid absorption and uptake, supporting blooms, crops, and harvests. The product is suitable for lawns and gardens and emphasizes improved flowering, fruiting, and overall plant vigor. Its formulation is designed for quick dissolution in water or irrigation systems, making it convenient for homeowners seeking fast-acting potassium for established turf and ornamentals while avoiding leaf burn or salt stress when applied correctly.
Supply Solutions 0-0-50 Plus 17% Sulfur (5 Pounds)
Small-bag option with the same 17-18-18 blend and SOP profile, optimized for homeowners who need a portable, easy-to-store solution. Its micronutrient support aids nutrient uptake and overall plant health. This format is well-suited for targeted applications on specific lawn patches, containers, or garden beds where quick, localized potassium supplementation is desired.
Buying Guide
- Formulation and balance: Look for 0-0-50 or similar potassium-focused formulations. Some products include sulfur and trace minerals, which can enhance nutrient uptake and stress tolerance.
- Application size and dilution: Choose bag sizes that fit your lawn’s area and your application method. Granular SOP is typically broadcast or spread with a fertilizer spreader; ultra-fine or water-soluble SOP may suit hydroponic or fertigation setups.
- Organic and safety considerations: If you require organic-use options, check for OMRI listings or organic-compliant labels. Follow label directions to avoid fertilizer burn or salt buildup.
- Soil and climate compatibility: SOP helps with drought tolerance and disease resistance in many turf types, but consider soil type, existing fertility, and local climate when planning applications.
- Timing and frequency: Plan spring and fall feeding as part of a seasonally appropriate schedule. Avoid application during drought unless irrigation is available to move nutrients into the root zone.
- Watering and incorporation: After broadcast application, water thoroughly to move nutrients into the root zone. For soluble SOP, inject into irrigation systems as directed for uniform distribution.
- Root and leaf health considerations: Potassium improves cell wall strength and overall vigor. Complement SOP with proper nitrogen management and micronutrient monitoring to maintain balanced growth.
- Compatibility: If you use other lawn care products, check compatibility charts or conduct a small test area to avoid adverse reactions or turf stress.