Patchy Brown Spots After Rototilling and Seeding: Brown Patch or Clay Barrier

New grass failing 2 months after rototilling/seeding on former dog area suggests either brown patch fungus or root restriction at clay interface.

Diagnostic Test

Tug test: Pull affected grass.

• Comes easily, few roots, slimy = brown patch
• Firm roots but stop at 3-4" = clay barrier

If Brown Patch

• Horticultural corn meal: 10 lbs/1,000 sq ft, water in
• Reduce irrigation frequency; water early AM only
• Mow high (3+"), collect clippings temporarily
• Apply light nitrogen (0.25 lb N) if deficient

If Clay Barrier (Likely Given History)

Rototilling 3-4" on clay creates a "bathtub" — water perches, roots hit hardpan.

1. Core aerate deeply (3" plugs)
2. Topdress ½" compost + expanded shale/lava sand
3. Drag into holes
4. Overseed thin areas
5. Monthly: sugar (3 lbs) + alfalfa meal (2 lbs) /1,000 sq ft

Dog History Note

Urine salts may persist. Gypsum (40 lbs/1,000 sq ft) helps displace sodium. Flush area deeply 2-3× before seeding next time.

Annual compost topdressing + aeration gradually transforms the profile. Patience builds permanent solution.