不同秧龄对沿江地区双季晚稻秧苗素质及产量的影响

以早熟高产品种上农粳2号和镇稻18为材料,采用常规毯苗机械栽插,分别设置20 d、24 d、28 d、32 d等4个秧龄处理,研究不同秧龄对沿江地区双季晚稻秧苗素质、生育进程、茎蘖动态及产量构成的影响。结果表明,随秧龄天数增加,参试品种的绿叶数、茎基宽和根系盘结力均逐渐升高;与20 d、24 d和28 d秧龄的处理相比,32 d秧龄处理的成熟期提前4~5 d,茎蘖高峰期提早15 d左右,结实率显著升高;与24 d秧龄处理相比,上农粳2号和镇稻18在32 d秧龄处理下的产量分别提高10.26%和20.82%。在秧苗强化化控和苗床管理的条件下,安徽沿江地区常规毯苗机插的栽插秧龄可延长至32 d。

Effects of Different Seedling Ages on Seedling Quality and Yield Components in Double-cropping Late Rice in Middle and Lower Reaches of Yangtze River

The effects of different seedling ages on seedling quality, growth, tillering dynamics and yield components of double-crop-ping late rice in the Yangtze River were studied in this paper, by blanket-seedling mechanical transplanting technique, using Shangnonggeng 2 and Zhendao 18 as materials. The results showed that the number of green leaves, stem width and root trophic force of the two cultivars increased gradually with the increase of seedling age. Compared with the 20 days, 24 days and 28 days seedling age treatments, the maturity date of 32 days seedling age treatment was earlier 4~5 days, and the tiller peak stage was 15 days in ad-vance, the seed setting rate was significantly increased. Compared with the 24 days seedling age treatment, the yield of Shangnonggeng 2 and Zhendao 18 of 32 days seedling age treatment increased by 10.26% and 20.82%, respectively. The seedling age of blanket-seedling mechanical transplanting in the Yangtze River could extend to 32 days.