西瓜是雌雄同株异花,靠昆虫传粉,上午开花,下午闭花,为半日花,花的寿命仅几个小时。由于西瓜开花时间短,传粉昆虫少,往往座果率较低。要想提高座果率,必须进行人工辅助授粉。早熟栽培的西瓜一般在5月中旬进入花期,通常是在上午6～7时开花,7～9时是柱头和花粉生理活动最旺盛的时候,这时进行人工辅助授粉效果最好,10时后授粉座果率显著降低。人工授粉的 Watermelon is monoecious different flowers, pollination by insects, flowering in the morning, flowers closed in the afternoon, half-day flowers, flower life is only a few hours. As watermelon flowering time is short, less pollinators, fruit set rate is often lower. In order to improve the fruit set rate, must be artificial assisted pollination. Early maturing watermelon into the flowering period in mid-May, usually at 6 am to 7 pm flowering, 7 to 9 pm when the stigma and pollen physiological activity of the most vigorous, artificial pollination at this time the best, 10 o’clock Pear fruit rate was significantly reduced. Artificial pollination