Recurring Yellow Patches After Green-Up: Nutrient Lockout

Chlorosis in Same Spots Year After Year

Yellowing in identical areas suggests soil-related nutrient tie-up—often from buried construction debris (concrete, lime, drywall) raising pH locally, locking up iron/manganese.

Diagnostic Test

Spray liquid foliar fertilizer (iron + nitrogen) on yellow patches at label rate. If they green up in 3–5 days, roots can't absorb soil nutrients—foliar bypass works. Confirms lockout, not disease.

Long-Term Fixes

• Soil test each zone – Map pH and nutrients.
• Acidify high-pH spots – Elemental sulfur, ammonium sulfate.
• Annual core aeration – Improves root access.
• Chelated iron applications – Seasonal band-aid while soil corrects.

First Mow Low + Rake = Good Start

But it's only step one. Follow with fertilizer, weed control, and pH management based on tests.