If the soil is moist and has never been planted before, there should be enough nutrients in the ground for turnips to come up. The only problem is deer normlly wont eat turnips until there's been a good frost which makes 'em sweet. You might try some of the new forage beets and forage radishes in the same areas. I understand it doesn't take much for those to grow, and the deer will hit 'em whether it's summer or winter.
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