寒露风是我区晚稻生产的主要气象灾害,晚稻受寒露风危害的主要特征是空秕粒增加,结实率下降,导致减产。 近几年来,我们用分期播种法进行试验。试验品种为杂交稻南优二号、汕优二号和晚稻常规品种包胎矮。试验从第一播种期抽穗开花始期至最后一个播种期开花末期止,每天进行定穗、定花考查空秕率和取 Cold dew is the main meteorological disaster of late rice production in our district. The main characteristics of late rice devastated by cold and wind are the increase of empty noodles and the decrease of seed setting rate, which lead to the decrease of yield. In recent years, we have carried out trials by staged seeding. The test varieties were hybrid rice Nanyou 2, Shanyou 2 and conventional rice variety Cotyledon short. Experiments from the first seeding stage flowering start to the end of the last flowering stage until the end of flowering every day for fixed spike, flower check empty rate and take