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以籼粳交超级稻甬优12为试材,四叶一心期带蘖小苗移栽,通过栽培措施的调控,形成超高产(>13.0 t hm–2)和高产(>12.0 t hm–2)群体,以高产群体作为对照,对分蘖挂牌追踪,比较研究超高产群体分蘖发生成穗特点。结果表明,超高产群体分蘖产量及对总产量的贡献率分别为11.53 t hm–2和87.77%,高产群体分别为10.59 t hm–2和87.40%。超高产和高产群体的分蘖利用都以一次和二次分蘖为主,超高产群体一次和二次分蘖的产量均高于高产群体,超高产群体一次分蘖产量的贡献率略低于高产群体,二次分蘖产量的贡献率高于高产群体。超高产群体一次分蘖发生在第1至第9叶位,第4至第7叶位是分蘖发生与成穗的优势叶位,二次分蘖以1/3、2/3、3/3、2/4、1/5蘖位优势较强。对于高产群体而言,一次分蘖以第4至第7叶位分蘖优势较强,二次分蘖以1/3、2/3、3/3优势较强,三次分蘖发生叶位数明显多于超高产群体,但成穗率较低。超高产群体成穗分蘖的穗长、单穗重、总粒数、着粒密度的平均值高于高产群体,结实率却略低于高产群体。
High-yielding (> 13.0 t hm-2) and high-yielding (> 12.0 t hm-2) seedlings were transplanted in the four-leaf stage with super rice (Yanyou 12) Groups, high-yield groups as a control, the tillers were traced to compare the characteristics of super-high-yielding population tillering into ear. The results showed that the yield of super high yielding population and its contribution to total yield were 11.53 t hm-2 and 87.77%, respectively. The high yielding population was 10.59 t hm-2 and 87.40% respectively. The primary and secondary tillers of super high yielding and high yielding population were dominated. The yield of primary and secondary tillers of super high yielding population was higher than that of high yielding population. The contribution rate of primary tillering yield of super high yielding population was slightly lower than that of high yielding population. The contribution of secondary tillering yield was higher than that of high yielding population. The first tillering occurred in the first to the ninth leaves of the super-high-yielding population. The fourth to the seventh leaves were the dominant leaf positions for tillering and spike formation. The second tillering was performed in 1/3, 2/3, 3/3, / 4, 1/5 tiller position stronger. For the high-yielding population, tillering had the advantage of tillering from the 4th to the 7th leaves, the second tillering had the advantage of 1 / 3,2 / 3 and 3/3, and the tiller number of the third tillering was significantly more than that of the super tillering High-yielding population, but lower spike rate. The average of spike length, single spike weight, total grain number and grain density of super-high yielding population was higher than that of high yielding population, but the seed setting rate was slightly lower than that of high yielding population.