Answer: Hollow centers in the tubers are usually the result of wide fluctuations of temperature and rainfall during the growing season. Potatoes thrive in loose, rich, well-draining soil, with regular feeding and ample water. You'll increase your yield by "hilling-up" around your potato stems. Use soil if you're growing them in the ground or mulch if you're growing them under straw. Watering regularly will keep the plants healthy and promote solid, sound tubers.
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