Chinese Journal OF Rice Science >
Effects of Panicle and Bud-promoting Nitrogen Fertilizer Application on Growth of Regenerated Bud and Grain Yield of Ratoon Rice
Received date: 2022-10-10
Revised date: 2023-01-16
Online published: 2023-07-17
【Objective】 This experiment was carried out with the aim to investigate the effects of different nitrogen (N) managements on the growth of regenerated buds, dry matter accumulation and allocation and yield formation of ratoon rice.【Method】 The experiment was conducted in a split-split plot design with three replications. The varieties, Fengliangyouxiang 1(FLYX1) and Liangyou 6326 (LY6326), were designed as main plots, the two panicle nitrogen topdressing rates as sub-plots (N1, 30 kg/hm2 as low level; N2, 60 kg/hm2 as high level), and three nitrogen application rates of bud-promoting fertilizer as sub-sub plots (T1, T2, and T3 were 0, 50 and 100 kg/hm2) under field conditions. The growth of regenerated bud, dry matter accumulation and allocation, aboveground biomass, grain yield and yield components of both varieties were measured.【Result】 The results showed that the high N fertilizer rate had no significant effect on main crop yield of FLYX1, but significantly increased the main crop yield of LY6326, and had no significant effect on ratooning ability and ratoon yield of both varieties. The application of bud-promoting nitrogen fertilizer significantly decreased dry matter translocation of stems and sheaths pre-full heading and harvest index in the main season, and increased dry matter accumulation post-full heading in the ratoon season, resulting in the high grain yield of ratoon rice via increasing the regenerated bud lengths at different nodes, the number of surviving buds and the ratooning ability. Besides, there were interaction effects between panicle nitrogen fertilizer application and bud-promoting nitrogen fertilizer application on ratoon rice yield. The highest annual production of FLYX1 and LY 6326 were 14.46 under the N1T3 treatment and 14.44 t/hm2 under the N2T2 treatment. The regenerated bud length, survival number of buds, and bud growth rate were positively and significantly correlated with the post-full heading dry weight accumulation in the main crop, and negatively and significantly with the translocation of pre-full heading dry weight and harvest index of the main crop; the ratooning ability and ratoon rice yield were positively and significantly correlated with the regenerated bud length, survival number of buds, and bud growth rate.【Conclusion】 High panicle nitrogen fertilizer application rate in the main crop had no significant effect on ratoon yield of both varieties, the application of bud-promoting nitrogen fertilizer enhanced regenerated bud growth, ratooning ability and ratoon yield, and the interaction between panicle and bud-promoting fertilizers significantly affected ratoon yield. Our results showed that bud-promoting fertilizer application increased ratooning ability and ratoon yield mainly via enhancing stem dry matter accumulation in main season and ratoon season, prompting bud growth and panicle formation of ratoon rice. However, more application rate did not further increased ratoon yield. The combination of low panicle nitrogen fertilizer rate and high bud-promoting nitrogen fertilizer and the combination between high panicle nitrogen fertilizer and high bud-promoting nitrogen fertilizer were advantageous to high annual grain yield in FLYX1 and LY6326, respectively. The results suggest that optical application rates of panicle and bud-promoting nitrogen fertilizers is beneficial for high grain yield of ratoon rice.
GAO Qianqing, REN Xiaojian, ZHAI Zhongbing, ZHENG Pubing, WU Yuanfen, CUI Kehui . Effects of Panicle and Bud-promoting Nitrogen Fertilizer Application on Growth of Regenerated Bud and Grain Yield of Ratoon Rice[J]. Chinese Journal OF Rice Science, 2023 , 37(4) : 405 -414 . DOI: 10.16819/j.1001-7216.2023.221002
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