The effects of the different weather (sunny or cloudy day) and the flowers with different treatments (clipping or no clipping) on the pollen vitality of summer squash (Cucurbita pepo L.) were studied. The results showed that the trend of pollen viability increased from the 6:00 and then decreased from the afternoon regardless of weather conditions and the flower treatments. The optimum pollination time(highest pollen vitality) is 7:00~9:00 and the suitable pollination time is 6:00~10:00 in the sunny day. The optimum pollination time is 9:00~10:00 and the suitable pollination time is 8:00~12:00 in the cloudy day. The pollen vitality of flowers with clipping is higher than pollen vitality without clipping no matter what the weather, and pollen survival time of flowers with clipping is longer than the pollen without flower clipping.%试验研究了不同的天气和是否束花处理对西葫芦花粉生活力的影响.结果表明,无论在晴天还是阴天及是否束花,西葫芦花粉生活力从6:00开始均表现出先上升后下降的趋势,晴天最佳授粉时间(花粉生活力最高)为7:00~9:00,适宜授粉时间为6:00~10:00;阴天最佳授粉时间为9:00~10:00,适宜授粉时间为8:00~12:00.将束花和不束花的西葫芦花粉生活力进行比较,结果表明,无论哪种天气,束花的西葫芦花粉生活力均高于未束花的,且花粉失活慢.
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