Abstract:

To invest the effect of vniconazle on mechanical transplanting  rice. This study took Huiliangyou 6 as experimental material and planted at seedling raising plates with different treatments of spraying uniconazole in 1.5 leaf age, and then 4 different age seedlings were transplanted into paddy field. The seedling quality, transplanting quantity and grain yield were tested. Results indicated as follows: ① in  serious over\|optimum stage of mechanical transplanting rice seedling, the comprehensive seedling quality decreased rapidly, i.e. the plant height increased, the MDA content in seedling leaf blades increased, while roots twisting power and root vigor decreased. All these eventually led to the decrease of transplanting quantity and seedlings revived slowly after transplanting. The grain yields of 25 d, 30 d and 35 d seedling age reduced by 1 403.55 kg/hm2，1 995.75 kg/hm2 and 2 920.95 kg/hm2, respectively, compared with that of 20 d seedling age; ② seedling quality, transplanting quantity and grain yield were significantly increased among treatments with spraying uniconazole, i.e. decrease of plant height, MDA content in seedling leaf, miss planting rate, etc. and increase of base stem width, number of green leaves, roots twisting power and root vigor, etc.. Compared with the control, the rice yield increased by 9%~32%; ③ the effects of spraying uniconazole with different concentrations on different transplanting seedling age were different. In optimum stage, there was no significant difference between different concentrations, but in the over\|optimum and over\|optimum stage, uniconazole spraying effect was enhanced with increasing concentration.

Key words: uniconazole, mechanical transplanting rice, seedling quality, transplanting quantity, grain yield

摘要：

为了研究烯效唑对移栽水稻影响机制，以两系杂交中籼稻徽两优6号为材料，培育毯秧苗，设置4种秧龄，并于一叶一心期叶面喷施不同浓度的烯效唑进行二次化控处理，考察秧苗素质并跟踪考察栽插质量和产量。结果表明：①随着秧龄的延长，秧苗综合素质下降，与对照20 d秧龄的秧苗素质相比，超秧龄秧苗尤其是严重超秧龄，秧苗素质和秧块状态迅速恶化，表现为株高增加，叶片丙二醛含量增加，发根力和根系活力降低，栽插质量下降，移栽后活棵慢；和20 d秧龄相比，25 d、30 d和35 d秧龄栽插水稻最终产量分别减产1 403.55 kg/hm2、1 995.75 kg/hm2和2 920.95 kg/hm2；②1叶1心期叶面喷施烯效唑二次化控处理可明显提高秧苗素质，与不喷施的对照相比，化控处理的秧苗株高、叶片丙二醛、漏插率、伤秧率、全漂率和翻倒率均明显降低，而百株干重、茎基宽、绿叶数、根数、发根力、根系活力、出苗率、株高整齐度、根系盘结力等则明显提高；与对照相比，水稻产量增加9%～32%；③不同秧龄对化控强度要求不同，适栽秧龄期，各浓度处理间并无显著差异；而超秧龄初期和中期阶段时烯效唑作用效果随喷施浓度的增加而越发显著。

关键词: 烯效唑；机插稻；秧苗素质；栽插质量；产量