The principle of selection of watermelon grafting rootstocks: 1. Select varieties with strong disease resistance; 2. Select varieties with strong cold tolerance; 3. Select varieties with good affinity and varieties with no premature senescence; 4. Select varieties that do not affect watermelon varieties. At present, there are two kinds of watermelon rootstocks, one is pumpkin, which has strong cold tolerance, but it affects the quality of watermelon. It can not be used on small watermelons. There is also a kind of gourd and melon, which should choose the varieties that do not prematurely decay.
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