粳型杂交稻超高产光合生产研究

 用作物群体物质生产研究法对粳型杂交稻“榆杂29”超高产的光合生产进行研究,结果表明:粳型杂交稻产量15t/hm²的群体生产率(CGR)19.7～25.3g/m²·d.CGR变化在同一地区呈相同变化趋势,不同海拔地点的CGR存在差异.超高产的CGR变化特点是齐穗后10天至成熟出现第二个峰值(24.5～42.7g/m²·d);孕穗期叶面积指数(LAI)达最大值9.26～9.58,抽穗后20天仍保持较高值的LA15.99～7.43.本田期平均净同化率(NAR)333～4.8Ig/m²·d,提高本田期两头的NAR是粳型杂交稻超高产的关键.超高产与组合的不落粒性、灌浆期长、穗大有关.超高产的技术路线有两种,构成产量的光合产物形成有区别.

Study on Super High-yielding's Photosynthesis Efficiency of Japonica Type Hybrid Rice

Super high-yielding's photosynthesis efficiency of Yu Za 29 variety(F1 japonica type hybrid rice)was examined with plant growth analysis.The resuIts indicated that crop growth rate(CGR)of japonica type hybrid rice at the level of 15 t/hm² grain vield was 19.7～25.3 g/m²·d The change of CGR was related to the elevation of crop's growing area. The characteristics of super high-yielding's CGR were that it performed the second peak value(24.5～42.7 g/m²·d) during 10 days after heading to ripening stage. The maximum value(9.26～9.58)of leaf area index(LAI)emerged at booting stage and it was still kept high level(599～743)relatively at 20 days after heading.The average net assimilation rate(NAR)was 3.33～4.81 g/m²·d during the period of growing in paddy-field after transplanting.The key of super high-yielding was to increase NAR at both early and end stages of rice growing period inthe field.The super high-yielding of Yu Za 29 variety was obtained related to the unshattering,the longer milk stage and the bigger size of ear and particles.There were two types of super high-yielding,in which the forming of assimilation product was different that constituted grain yield.