母本抛秧的生育特性及制种技术

Growth Characters of Mother Parents Transplanted with Scatter Transplanting method and its Seed Production Techniques in Rice

通过母本抛秧与常规手插秧制种的比较试验，对母本抛秧的生育特性进行了研究。结果表明，母本抛秧秧苗期生长量少，出叶速度慢，抛栽至分蘖期出叶速度快，播始历期较手插秧长２天，主茎叶片数为１２．５叶，较手插秧少０．３叶，分蘖发生早，数量多，成穗率低；穗型偏小，但有效穗数增多。提出母本抛秧制种应较往年正常播期提前１～２天。肥水运筹上，基追肥比例以１∶１为宜，水浆管理改一次晒田为两次晒田，控制群体，提高成穗率。

Comparison of the rice seedlings that transplanted with scatter transplantation and hand transplantation showed that the growth characters of the mother parent nursed in plastic plate seedlings were characterized by lower growth arte,and lower leaf growth speed at early seeding stage,but faster leaf growth speed from scattering to tillering than the seedlings growing in paddy field.The duration from sowing to initial heading for scatter transplanted seedlings was 2 days longer than that for traditional hand transplanted seedlings.The leaves of main stem for scattered seedlings were 12.5,0.3 leaf less than that for hand transplanted seelings.However,the scattered seedlings had earlier tillering and more tillers,lower rate of earbearing tiller,smaller spike,but more effective spikes than the hand transplanted seedlings.On the base of above results,the sowing date of female parent that transplanted with scatter method should be 1-2 days earlier than that with hand transplantation method.The fertilizer application should be in the proportion of one base fertilizer to one additional fertilizer.In water management,two times of parching field should be adopted so as to control the population and raise the rate of earbearing tiller.