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| DOI：10.13522/j.cnki.ggps.2020024 |
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| Effects of Different Panicle-typed Varieties and Transplanting Density on Yield, the Ability of Seedling Growth and Dry Matter Accumulation of Ratooning Rice |
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ZOU Dan, TANG Qiyuan*, ZHENG Huabin, WANG Weiqin,ZHANG Xiang, LIU Gongyi, MO Wenwei, ZHENG Zhigang
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College of Agronomy, Hunan Agricultural University, Changsha 410128, China
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| Abstract: |
| 【Objective】The purpose of this paper is to explore the effects of different panicle-typed varieties and transplanting densities on the ability of seeding growth and yield in the ratooning season of ratooning rice.【Method】The split-plot experiment of double factors was designed, the transplanting densities was main-plot (D1: 1.5×104 hills per hectare, D2: 1.875×104 hills per hectare, D3: 2.25×104 hills per hectare, D4: 2.625×104 hills per hectare, D5: 3.0×104 hills per hectare, D6: 3.375×104 hills per hectare), the panicle-typed varieties was subplot (TYHZ: multi-panicle-type variety; HLY898:the panicle-kernel-type variety; YLY900:the big-panicle-typed variety).【Result】The response of different panicle varieties to transplanting density were different. The optimal yield of both panicle-kernel-type variety HLY898 and multi-panicle-type variety TYHZ are D3 treatment, while there was no significant difference under YLY900. The overall effects of three panicle-typed varieties on the yield and yield components, ability of seedling, dry matter accumulation and distribution，and the rate of empty hill presented HLY898 > TYHZ = YLY900. The yield of HLY898 was significantly higher than the other two varieties and the amount of rise was 9.99%~11.70%. From the analysis of yield and yield components, D3 treatment has the highest setting rate, grains per panicle and yield, and the yield is significantly higher than D1, D5 and D6 treatment, the amount of rise was 5.4%~22.7%. The seedling pile ratio and the highest regeneration seedlings per unit area of D3 treatment is the optimum, significantly better than D6 treatment. The panicle forming ability of D3 and D4 treatment are the optimum, significantly higher than D1, D2 and D6 treatment. The dry matter accumulation of D5 treatment is the optimum, and the harvest index of D3 treatment was the optimum. Under different transplanting densities, the low and medium transplanting density was the optimum on the rate of empty hill in the ratooning season of ratooning rice, significantly better than D6 treatment. Yield, yield components and the ability of seedling growth of panicle-kernel-type variety HLY898 were the optimum, with stronger adaptability. The ability of seedling growth and yield of medium density treatment are significantly higher than other density treatments, and the yield components are more coordinating, which can give full play to the yield potential of the variety to achieve higher yield.【Conclusion】The panicle-kernel-type variety HLY898 and the combination of transplanting density of 2.25×104 hills per hectare has the best comprehensive performance and the highest yield in the ratooning season. |
| Key words: transplanting density; ratooning rice; the ratooning season; yield; seedling growth |
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