农民种植瓜类蔬菜,习惯于自己留种。对于常规良种,农民自己留种是可行的。但不少农民在留种时,不认真选择,有些甚至用温室栽培的瓜或食用瓜的种子作种,以致一个好的新品种不出几年便混杂退化,种性变差,经济性状变劣,品质和产量下降。现将留种防退化的经验介绍如下,供读者参考。 Farmers grow melons and vegetables, used to keep their own species. For regular seeds, it is feasible for farmers to keep their own seeds. However, many peasants do not choose carefully when they leave their homes. Some even use seeds grown in greenhouses or edible melons as seeds so that a good new variety will be mixed and degraded within a few years, with poor species and poor economic performance , Quality and output decline. Now stay kind of anti-degradation experience introduced below, for readers reference.