杂交稻高产结构研究
Studies on Key Components for Obtaining High Grain Yield of Hybrid Rice
-
摘要: 定位追踪点和示范片双季杂交稻平均年产量15.6~17.6t/hm2.产量构成因素中以单位面积总粒数与产量的相关性最密切,对增产的贡献率最高,穗数则是制约单位面积总粒数的主要因素.高产田呈现“1+3+7”的穗数结构模式,即在1m2植25丛、每丛1株的密度条件下,每丛穗数由1个主茎、3个秧田分蘖、7个本田早期分蘖构成.秧田分蘖成穗率在95% 以上,本田期有效分蘖是移栽后头4片新生叶的同伸蘖.有效分蘖终止期距分蘖高峰期2.0~3.5个出叶间隔,分蘖高峰期的叶龄余数为2.0~2.5,相当于二次枝梗分化至颖花分化期.Abstract: The results indicated that, the annual averaged yield of hybrid rice with double cropping in Longhai was 15.6~17.6t/hm2. Among the components, the total grain number per unit area was the most important to the yield of high yielding field,and the panicle number was the most im-portant to total grain number per unit area. In high yielding condition, the modle of heading num-ber appeared “1+3+7”,i.e. under the condition of planting 25 hills in 1 m2 and one hill with one seedling, each hill will produce one main stem head, 3 tillering heads emerged during seedling peri-od and 7 tillering heads during early tillering period. More than 95% tillers emerged during seedling period was able to grow to heading. The effective tillers emerged in field-growing period were the ones emerged with the growth of first 4 leaves after transplanting, The end of effective tillering in field was found at the period when 2.0~3.5 leaves emerged before maximum tiller-ing. The remainder of leaf age after maximum tillering was 2.0~2.5 leaves, which was equal to the duration from secondary branch differentiation to spikelet differentiation.
-
Key words:
- Hybrid rice /
- Yielding component /
- Effective tillering duration /
- Sink-source relation
-
[4] 颜振德. 1980. 杂交水稻产量构成因素的研究. 水稻杂种优势的利用研究, 63-82. 农业出版社, 北京 [9] Yoshida, s. 1981. Fundamentals of rice crop Science. IRRI
点击查看大图
计量
- 文章访问数: 2073
- HTML全文浏览量: 111
- PDF下载量: 495
- 被引次数: 0