瓜类蔬菜都是异花授粉作物,不同品种容易杂交,故在留种时,要严格做好隔离工作。 1.黄瓜 用第一个瓜作种成熟较早,用第二个和第三个瓜作种则成熟较晚。结第一个瓜时气温低,往往受精不好,所结的种子数量较少,种子小,要进行人工授粉来提高种子的数量和质量。第二个瓜和第三个瓜作种,种子饱满,数量较多。因此,如果想使黄瓜早熟,最好选第一个瓜留种;如一般大田用种也可选第二个或 Melons and vegetables are cross-pollinated crops, easy to hybridize different varieties, it is necessary to stay species, strict isolation work. 1. Cucumbers with the first melon as a species of mature earlier, with the second and third melon for the species later mature. The first melon when the temperature is low, often insemination is not good, the number of seeds knot less seeds is small, artificial pollination to improve the number and quality of seeds. The second melon and the third melon for seed, full of seeds, a large number. Therefore, if you want to make cucumbers early, it is best to choose the first melon stay species; such as general field species can also choose the second or