Grafting techniques are generally not used in the growth management of the following cultivated plants in Weifang: () A. Cucumber in Shouguang high-temperature greenhouse B. Both sides of Mihe River in Qingzhou Grafting belongs to asexual reproduction, and there is no process in which sperm and eggs combine to form fertilized eggs, so offspring generally do not mutate and can maintain the stability of excellent characters of grafted scions, while rootstocks generally do not affect the heritability of scions. Therefore, grafting technology is often used in the propagation of watermelon, peach and greenhouse cucumber.

Among the options, silver melons on the beach are suitable for breeding with seeds. Daytime light and high temperature on the beach can promote the photosynthesis of melon leaves and create more nutrients. The low temperature at night slows down the respiration of melon leaves, which is beneficial to the accumulation of nutrients, thus forming the unique flavor of Qingzhou Yingua, which is sweet, fragrant and crisp, and is also the main reason for the high sugar content of Qingzhou Yingua.

So choose: B.