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Acta Agron Sin ›› 2013, Vol. 39 ›› Issue (08): 1434-1444.doi: 10.3724/SP.J.1006.2013.01434

• TILLAGE & CULTIVATION·PHYSIOLOGY & BIOCHEMISTRY • Previous Articles     Next Articles

Effect of Planting Methods on Differentiation and Retrogression of Branches and Spikelets of Hybrid Rice Cultivar

LIU Li1,LEI Xiao-Long1,WANG Li1,DENG Fei1,LIU Dai-Yin2,REN Wan-Jun1,*   

  1. 1 College of Agronomy, Sichuan Agricultural University / Key Laboratory of Crop Physiology, Ecology, and Cultivation in Southwest China, Chengdu 611130, China; 2 Sichuan General Popularization Centre of Agricultural Technique, Chengdu 610041, China
  • Received:2013-01-14 Revised:2013-04-22 Online:2013-08-12 Published:2013-05-22
  • Contact: 任万军,E-mail: rwjun@126.com

Abstract:

In order to explore the characteristics in spikelets formation of hybrid rice with mechanical sowing and transplanting, the effects of planting method and seedling number per hill on differentiation and retrogression of branches and spikelets were studied using F you 498 in the field experiments. The results showed that the number of differentiated and survived branches in mechanical direct seeding and mechanical transplanting was significantly higher than that in artificial transplanting, however, the survived spikelets in mechanical direct seeding and mechanical transplanting were significantly lower than those in artificial transplanting. The number of differentiated and survived primary branches and spikelets were higher in mechanical direct seeding than in artificial transplanting, while those in mechanical transplanting were the lowest. The numbers of differentiated and retrograded secondary branches in mechanical direct seeding and mechanical transplanting were significantly higher than those in artificial transplanting. However, the number of differentiated secondary spikelets was higher in mechanical transplanting than in artificial transplanting, and was the lowest in mechanical direct seeding. The number of differentiated and retrograded primary and secondary branches and spikelets were significantly lower in high seedling number per hill than in low seedling number per hill. The number differences of differentiated and retrograded secondary branches in all of the planting methods presented mainly on the basal panicle, the number of survived secondary branches showed an increased and then decreased tendency on different primary branches, which was mainly related to the serious secondary branches retrogression. The number of survived primary spikelets decreased from panicle bottom to top, the number of survived secondary spikelets was related to the ability of spikelets differentiation. Therefore, for the effect of interaction between planting methods and seedling number per hill, the low seedling number per hill showed the combined with mechanical transplanting and artificial transplanting, while the high seedling number per hill showed the combined with mechanical direct seeding.

Key words: 水稻, 机直播, 机插, 穴苗数, 枝梗, 颖花

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