湖南晚稻补种救灾早熟晚粳品种的筛选

为了探讨晚稻秧苗遭受洪涝灾害后的补救措施,从辽宁、吉林、黑龙江引进了18个不同熟期晚粳品种在长沙进行了播种期试验.结果表明:从播期来看,以6月25日播种的产量最高(5.60 t/hm2),且与6月10日和7月10日播种的差异均达到了显著水平；从品种来看,吉粳83号、沈农265和辽星1号的产量表现较好,特别是吉粳83号,其6月25日播种的产量达7.50 t/hm2,其高产主要表现在顶3叶更长更宽和抽穗前后积累的干物质更多;各品种的全生育期为100 ～117 d,比品种原产地减少了25 ～54 d.由此可见,在双季晚稻遭受洪涝灾害后,从中国东北三省引进适宜的早熟晚粳品种可作为湖南双季稻区晚稻生产的灾后补种品种.

Screening of Early Maturing Late Japonica for Reseeding and Relieving of Late Rice in Hunan Province

The seedlings of late rice have often been damaged by floods in Hunan province in recent years.In order to discuss the countermeasures of remediation,18 varieties of different growth stage were introduced from Liaoning,Jilin and Heilongjiang provinces to carry out the experiment of seeding time.Results showed that a maximum grain yield of 5.60 t/hm^2 was produced under the seeding time of 25th June,significantly above that under the seeding time of 10th June and 10th July.Varieties Jijing 83,Shennong 265 and Liaoxing 1 had better yield potential than others,especially Jijing 83 planted on 25th June which yield reached 7.50 t/hm^2 due to the top three leaves longer and wider,and accumulating more dry matter around heading stage.The growth stages of all varieties are 100~117 d,25~54 d less than that planted in original districts.Hence,we can bring some suitable early maturing Japonica varieties from northeastern provinces of China as the remedial measures when late rice is damaged by floods in Hunan.