Method for increasing watermelon grafting survival rate

The invention discloses a method for increasing the watermelon grafting survival rate. According to the method, abscisic acid solution is sprayed to watermelon seedlings and rootstock seedlings before grafting, and small sheds which can preserve heat and humidity and is subjected to bactericide treatment are set up in advance; grafting is conducted through the root-cutting cleft grafting method, and bactericide is sprayed after grafting is completed. The plant stress resistance is improved, the grafting method is efficient, the suitable environment is beneficial to fusion of the watermelon seedlings and the rootstock seedlings, the high survival rate and strong seedlings are guaranteed, seedling recovering is quick after the watermelon seedlings are transplanted, and a basis is laid for achieving high yield and high quality. Test results show that by adopting the method, the grafting survival rate reaches 98.7%, and the repeat deviation is small; compared with conventionally grafted seedlings, the stem diameter, the maximum leaf area, the root cap ratio, the chlorophyll content and the root vigor are increased.