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Potassium sulfate (0-0-53) is a premium potassium fertilizer containing 53% K₂O and 17% sulfur, with virtually no chloride content. Unlike muriate of potash (potassium chloride), which contains about 47% chloride, potassium sulfate is safe for chloride-sensitive crops. This makes it ideal for:

• Tobacco, potatoes, tomatoes, and berries that suffer quality losses from chloride
• Fruit crops where chloride reduces sugar content and storage life
• Situations where salt accumulation is a concern
• Crops requiring both potassium and sulfur

While more expensive than muriate of potash, the quality improvements and yield benefits often justify the cost, especially for high-value crops.

Timing varies by crop, but key application periods include:

• Fruit trees: Split applications - early spring and during fruit development
• Vegetables: At planting and again during fruit/tuber formation
• Grapes: From veraison (color change) through harvest for quality
• Field crops: Pre-plant or side-dress during rapid growth
• Lawns: Late summer/fall to improve winter hardiness

Potassium is especially important during fruit development, as it improves size, color, sugar content, and storage quality. Late-season applications enhance crop quality without promoting excessive vegetative growth.

Potassium plays multiple critical roles in plant health:

• Water regulation: Controls stomatal opening/closing for efficient water use
• Enzyme activation: Activates over 60 enzymes involved in growth
• Photosynthesis: Essential for CO₂ fixation and sugar transport
• Disease resistance: Thickens cell walls and improves structural integrity
• Stress tolerance: Enhances drought, cold, and salt tolerance
• Quality factors: Improves color, flavor, texture, and nutritional value

Plants with adequate potassium show improved resistance to fungal diseases, better recovery from stress, and enhanced winter survival.

Yes, potassium sulfate is excellent for hydroponics due to its complete water solubility and dual nutrient content. Benefits for hydroponic use include:

• Provides both K and S without adding chloride
• Won't clog drippers or emitters when properly dissolved
• Compatible with most hydroponic nutrients
• Helps maintain proper electrical conductivity (EC)
• Essential for fruiting crops in hydroponic production

Typical rates: 2-3 tablespoons per gallon for general feeding, contributing approximately 0.7-1.0 mS/cm to EC. Always dissolve completely in warm water before adding to your reservoir.

Potassium deficiency symptoms typically appear on older leaves first and include:

• Marginal chlorosis: Yellowing or browning of leaf edges (margins)
• Necrotic spots: Dead tissue spots on leaves
• Weak stems: Lodging in grains, weak branches in trees
• Poor fruit quality: Small size, poor color, low sugar content
• Increased disease: Higher susceptibility to pathogens
• Reduced yields: Fewer and smaller fruits/seeds

Deficiency is most common in sandy soils, after heavy rainfall, or when high nitrogen rates are used without balanced potassium. Soil tests showing less than 150 ppm K typically indicate supplementation is needed.