汕优63在我地杂交稻种植中,目前是主要当家品种,尤以成熟早、穗大粒多、茬口适宜、丰产性好而受到农户的普遍欢迎。由于结实率波动大,足穗增粒增产的策略难以得到保证,分析气象条件对汕优63结实特性的影响,指出低温危害的综合指标,并根据当地气候资源,合理安排播栽期和最佳抽穗 Shanyou 63 is the main species under hybrid rice cultivation in our country. It is generally welcomed by peasant households, especially in mature early, large spikelets, suitable stubble and high yield. Because of the large rate of seed setting, it is hard to guarantee the strategy of increasing the yield of ear by increasing the number of ear and increasing the grain yield. The effect of meteorological conditions on the seedling characteristics of Shanyou 63 is analyzed. The comprehensive index of low temperature damage is pointed out. According to the local climate resources, Heading