%0 Journal Article %A LI Zujun %A HE Xunfeng %A TAN Yiqing %A ZENG Yanhua %A ZENG Yongjun %A SHI Qinghua %A WU Ziming %A LI Huijie %T Collocation Modes for Different Varieties of Double-Cropping Direct-Seeding Rice %D 2021 %R 10.11869/j.issn.100-8551.2021.03.0688 %J Journal of Nuclear Agricultural Sciences %P 688-696 %V 35 %N 3 %X In order to investigate the effects of different early and late rice combinations on growth characteristics, yield formation and rice quality under double-cropping and direct seeding conditions, three early rice varieties (QLY2012, TLY 83, XZX45) and two late rice varieties (YY1538 and TY398) were used as experimental materials in this experiment. Four combination modes were designed, inbred indica rice XZX45 planted as control treatment (CK): XZX45-XZX45; Early indica-Late japonica (M1): QLY2012-YY1538; Early Indica-Late Indica (M2 same variety planted as early rice and late rice): QLY2012 - QLY 2012; Early Indica and Late Indica (M3 different varieties planted as early rice and late rice): TLY83 - TY398, with control (CK): XZX45-XZX45. The annual growth period, population quality, yield composition, annual yield, rice quality and RVA characteristic spectrum of rice starch were studied. The results showed that, these combinations were all heading safely, and the longest annual growth period was M1 (222 days), which was 16 days longer than CK; the highest annual total yield was M1 (14.82 t·hm-2), which increased 1.56 t·hm-2 compared with CK, with an increase rate of 11.76%; the second was M2, its annual total yield was 14.29 t·hm-2, which increased by 1.03 t·hm-2 and the growth rate was 7.77% compared with CK, and the annual total yield of M3 increased by 5.28% compared with CK. The analysis on the characteristics of population quality and yield components of different early and late rice collocation modes in double-cropping and direct-seeding rice, showed that the collocation mode with higher annual yield had the characteristics of large dry matter accumulation from heading stage to maturity stage, large leaf area index from booting stage to maturity stage, large spike size, high seed setting rate and daily yield of early and late rice. M1, M2 and M3 treatments had better rice quality and RVA profile than CK, but no significant difference was observed in early rice. Generally speaking, the collocation mode (M1) guarantees annual yield, and rice quality is better than other modes, which can provide a reference for portable cultivation of double-cropping rice. %U https://www.hnxb.org.cn/EN/10.11869/j.issn.100-8551.2021.03.0688