再生稻各节位分蘖的抽穗期和经济性状观察

Study of Tillers Heading Stage from Different Nodes of Ratoon Rice and Its Economic Character

选用Ⅱ优623和天优3301品种,定株定蘖观察不同节位再生分蘖的抽穗期和经济性状。结果表明,分蘖抽穗期随节位下移而推迟,每低一节平均推迟2～3 d,二次分蘖抽穗期比其母茎平均推迟12～14 d;分蘖萌发成穗率和结实率也随节位下移而降低;每穗粒数和千粒重以倒3分蘖最多,倒2分蘖次之,倒4、5分蘖再次之,二次分蘖显著减少;在头季成熟时高桩手割条件下,倒2、3分蘖合占再生季70%的穗数、80%的产量。研究结果为诊断各节位再生分蘖的生育进程和掌握调控时机提供了科学依据。

In the present work,we studied the heading stage of regenerated tillers from different nodes and its economic character of II You 263 and Tianyou 3301.Results,the lower the nodes located,the later heading stage of tiller started.The tiller heading stage of lower nodes delayed 2-3 days compared to that of nodes which just upper side;the second tiller heading stage delayed 12 ～ 14 days compared to that of the main stem;lower tillers spike rate and ripening rate were also decreased;the number of grains per panicle and thousand-grain weight of the inversed third tillers were the most,and that of the inversed second tillers were less than the inversed third tillers;the number of grains per panicle and thousand-grain weight of the inversed fourth and the inversed fifth tillers were the less than that of the inversed second tillers.The number of grains per panicle,and thousand-grain weight of the regenerated tillers were significantly decreased.Under the hand-cut condition in the first ripening season,the yields rate of inversed second and inversed third tillers accounted for 80%,and the spike number was equal to 70% of the second ripening season.The results provided a scientific basis for the diagnosis of reproductive process and decision of controlling time to the ratoon rice.