You've got bermuda, low potassium, mud, and a March fescue question.
Pasture management is complex. Read UGA's Pastures in Georgia and Forages for Horses.
You've got a big row to hoe. Start with the publications.

Horses Chewing Pine Trees: Bark Protection and Nutritional Causes
Saving Trees from Horse Bark Chewing and Preventing Recurrence
Restoring Horse-Damaged Parkland: Soil Repair, Grass Selection, and Realistic Expectations
Smart Water Management: Strategies for a Drought-Resilient Garden
Horse-Toxic Plants: Protecting Equines from Garden Hazards
Managing Carpenter Bees: Purple Martins and Trapping Options
Protecting Crapemyrtle Trunks from Horses: Chicken Wire Better Than Pipe
Drastic Crape Myrtle Pruning: Recovery and Management Plan
Broomsedge Control in Pastures: Management Over Herbicides
Growing Sunflowers from Birdseed: Pasture Planting Guide
Cool-Season Grass for Horses: Beyond Kentucky 31 Fescue
Managing Broomsedge in Pastures: Patience and Proper Grazing
Iron Stains from Lake Water: Consult Lake Management Experts
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