为了正确掌握和充分利用杂交水稻的分蘖习性,从1978—1980年对“汕优6号”等品种进行了系统观察,以便在栽培上为制订提高有效分蘖率的措施提供依据。 (一)材料与方法供试品种以“汕优6号”为主,参以“威优6号”、“四优2号”。早造3月上中旬播种,晚造6月下旬7月上旬播种,亩播量20—25斤。早造4月21—27日插秧,晚造7月25至8月6日插秧,秧龄早造平均6.6±0.75 In order to correctly grasp and make full use of the tillering habits of hybrid rice, we systematically observed the varieties “Shanyou 6” from 1978 to 1980 in order to provide the basis for the formulation of measures to improve the effective tillering rate. (I) Materials and Methods The tested varieties were mainly “Shanyou 6” and were referred to as “Weiyou 6” and “Siyou 2”. As early as mid March planting on the early, late late June early July planting, mu sowing 20-25 kg. As early as April 21-27 planting, planting late July 25 to August 6 transplanting, seedling age as early as 6.6 ± 0.75