培矮64S系列组合制种稻粒黑粉病防控技术研究

Control of Kernel Smut in Hybrid Seed Production of the Combinations of Pei'ai 64S

研究了肥水管理、“九二 0”施用时期与用量、轻度割叶对两系杂交水稻培矮 64S系列组合制种稻粒黑粉病发生的影响 ,提出降低氮肥用量、及早晒田控制无效分蘖 ,在见穗蔸率 3 %～ 5 %喷施“九二 0” ,适当增加其用量以及在喷完后轻度割叶等措施 。

In the experiments of hybrid seed production of the combinations of Pei'ai 64S at Cili County and Zhijiang County in Hunan Province during 1995～1996, the effects of water and fertilizing management, spraying of GA 3 and leaf-clipping were studied on the incidence of rice kernel smut. The results showed that the measures of reducing the amount of nitrogen fertilizer applied, controlling nonproductive tillers by drying field as early as possible, spraying GA 3 at 3%～5% panicles headed and increasing GA 3 dosage to 450～525 g/hm 2, and cutting slightly leaves after GA 3 spraying could decrease effectively the incidence of kernel smut of Pei'ai 64S in its hybrid seed production, thus the seed yield and quality were apparently increased and improved.