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Sweet Potato Harvest Failure in Zone 5: Likely Low Potassium

Tiny roots only = low potassium (essential for tubers). Test soil. Clay? Add lime if acidic (confirm first). Plant slips in compost/manure mix. Hill vines 5" soil/straw. Stop hilling at flower, mulch heavy. Water deep 2×/week. No high N.

Harvest when foliage browns, soil dry. Dig by hand. Space slips 6".

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