种植赣杂3号油菜，在油菜开花前，把种植的油菜分为自然授粉、蜜蜂授粉和无蜂授粉三个区。然后测定座果率、产量、千粒重、畸形率、发......

Flowering plants have evolved many different techniques to ensure pollination. In some species self-pollination is the n......

苜蓿是世界农牧业发展中极为重要的一种豆科牧草.根据资料对苜蓿的花器构造及开花过程、花部构成特点、环境因素对其泌蜜的影响、......