长沙烟稻轮作区烤烟正常与推迟采收条件下的适宜晚稻品种筛选

为了筛选出适应长沙烟稻轮作区不同烟叶采收期的晚稻品种，模拟烤烟正常采收与推迟采收两种条件，以15个晚稻品种为材料开展了大田品种比较试验。结果表明：（1）从全生育期角度，6月18日播种条件下，所有品种均适合作烟后晚稻种植，而6月28日播种条件下仅湘丰优103、隆香优130、深优9520、湘丰优9号、金优284、丰源优299、丰源优272能够正常成熟；（2）从产量角度，6月18日播种条件下，两优527、丰源优272和隆香优130产量可达8000 kg/hm2左右，是烟稻轮作区烟叶正常采收条件下烟后晚稻品种的首选；6月28日播种条件下，丰源优272、湘丰优103、深优9520和湘丰优9号是较佳选择，产量可达7600kg/hm2以上；（3）相关分析表明，产量与每穗粒数呈显著正相关，与经济系数呈正相关，因此选择穗型较大、经济系数较高的晚稻品种易获得高产。结果对长沙烟区烟后晚稻品种选择具有一定指导作用。

Optimal Late Rice Variety Screening Under Normal and Delayed Harvest of

In order to screen out optimal varieties which adapt to different harvest time of flue-cured tobacco in tobacco-rice rotation region of Changsha, variety comparative experiments were conducted with 15 late rice varieties as materials under two simulated harvest time of flue-cured tobacco, normal harvest and delay harvest. The results showed that: (1) Looked from whole duration, all varieties adapted to be planted as late rice after tobacco under sown on 18th June, while only Xiangfengyou 103, Longxiangyou 130, Shenyou 9520, Xiangfengyou No.9, Jinyou 284, Fengyuanyou 299 and Fengyuanyou 272 could mature normally under sown on 28th June. (2) Looked from yield, under sown on 18th June, yield of Liangyou 527, Fengyuanyou 272 and Longxiangou 130 could reach to about 8000 kg/hm2, which were the first choice of late rice variety after tobacco for tobacco-rice rotation region under normal harvest of tobacco leaves. Under sown on 28th June, Fengyuanyou 272, Xiangfengyou 103, Shenyou 9520 and Xiangfengyou No.9 were ideal choices, whose yield was above 7600 kg/hm2. (3) Relational analysis showed that very significantly positive correlation existed between yield and grain number per panicle, and positive correlation existed between yield and harvest index. So choosing late rice varieties with bigger panicle type and higher harvest index was easy to gain high yield. The results provide the guidance for late rice variety screening in Changsha tobacco area.