条件筛选
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Detailed Explanation of Key Technical Points for Overwintering Onion Seedlings by Heeling In
Before heeling in, first dig the seedlings out of the field (try not to damage the root system), shake them gently to shake off loose soil, and remove seedlings with no roots, no growing point, overly short, or thin and spindly ones, as well as leggy seedlings with overly long leaves, tillering seedlings, and pest- or disease-damaged seedlings, along with scallion seedlings (the leaf sheath part of scallion seedlings