旱育中籼稻根系形态性状及其与产量构成因素关系的研究

盆栽条件下 ,以水育秧为对照 ,研究旱育中籼稻汕优 63本田期根系形态性状及其与产量构成因素的关系。结果表明 :旱秧稻移栽期根系诸形态性状均显著小于水育秧 ;N -n期与水育秧的差异明显缩小 ;拔节期旱秧稻根系诸形态性状均超过水育秧 ,旱秧稻前期表现出强大的发根优势 ;拔节后 ,旱水秧根系诸形态性状差异又趋缩小 ,至抽穗期两者之间无显著差异。旱秧稻较水育秧产量高 ,影响旱秧稻产量的主要根系性状是每株根体积、根数和根干重。促进旱秧稻生育中后期根系的生长 ,充分挖掘旱秧稻的结实潜力 ,是旱秧稻高产栽培中不可忽视的一个问题。

STUDY ON MORPHOLOGICAL CHARACTERS OF ROOT ANDTHEIR RELATION WITH YIELD COMPONENTS OF THE DRYRAISED MIDSEASON INDICA RICE

With the mid\|season Indica hybrid rice Shanyou 63 as material, the morphological characters of root of dry\|raised seedling(DRS) and their relation with yield components were investigated compared with the moist\|raised seedling(MRS) cultivated in pots. The results were as follows: Root characters of DRS were less than that of MRS at transplanting stage, and the difference between DRS and MRS greatly reduced at the N-n leaf\|age stage, all root characters of DRS exceeded that of MRS at elongation stage, DRS had obvious superiority in root growth at early stage, while at heading stage, there was no significant difference between DRS and MRS. DRS was higher in yield and its yield was mainly subjected affected by the volume, number and dry weight of root per plant. Results inferred that cultiva\|ting root with high quality in DRS was important to achieve high yield.