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Yellow St. Augustine Patches: Iron Deficiency from High pH

20-year lawn, yellow but healthy = iron lockup from high pH. Liquid iron foliar spray greens fast. Long-term: soil test, sulfur to lower pH, complete fertilizer with minors. Soil likely depleted after 20 years.

Lawns: Yellow Spring Lawn in Central PA: Diagnosing the Cause; Year-Round St. Augustine Care in Southern California; Dead St. Augustine in Florida: Fertilizer Won't Resurrect; Iron Filings on Lawn: A Risky Home Remedy; Comprehensive St. Augustine Renovation in Orlando; Fixing Yellow St. Augustine Grass: Nutrient Deficiency Solutions; Yellow St. Augustine After Fertilizer & Ironite: Chemical Overload; Will St. Augustine Grass Thrive in Salem, Alabama?; Yellow St. Augustine: Check for Thatch, Not pH; St. Augustine Grass: The Lush, Shade-Tolerant Lawn for Warm Climates

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