Kennebec Potato Deformities: Soil, pH, and Cultural Fixes

Diagnosing Knobby, Fused, Split Potatoes

Your "Mickey Mouse" potatoes indicate two main issues:

1. Heavy clay soil restricts tuber expansion → fusion, splitting.
2. pH too high (alkaline) → poor tuber quality; potatoes need 6.0–6.5.

Comprehensive Cultural Program

• Soil prep: Deeply incorporate compost, aged manure, peat moss, shredded leaves. Create loose, loamy bed.
• pH adjustment: Test soil; add sulfur/gypsum to reach 6.0–6.5.
• Seed prep: Cut certified seed potatoes (2–3 eyes each); dust with sulfur if wet climate.
• Planting: 2–3 weeks before last frost; 6 inch spacing, 5 inch depth.
• Hilling: Mound soil/straw as vines grow—keep tubers covered (prevents greening).
• Water: Deep, 2×/week; mulch heavily after flowering.
• Fertilizer: Low N; compost/manure at planting usually sufficient.
• Harvest: After vines brown; dig by hand; cure in dry soil before storage.

Why Store Potatoes Fail as Seed

Commercial potatoes are treated with sprout inhibitors. Always use certified disease-free seed potatoes.

These changes will yield smooth, uniform Kennebecs like market quality.