论文部分内容阅读
为明确长沙烟区烟稻复种体系烟后晚稻的适宜施氮量和种植密度,以丰源优299为材料,于2013-2014年在湖南省长沙市浏阳市开展了烟后晚稻的肥密互作效应研究。结果表明:烟后晚稻全生育期因施氮延长2d,与密度无明显关系;水稻LAI整体随施氮量和密度增大而提高,但是施氮量和密度间存在互作效应,且两年的互作效应有差异;烟后晚稻叶片SPAD值因施氮而明显提高,与密度关系不大;水稻产量构成因素中,千粒重较稳定,不因密度与施氮量变化而发生显著变化;密度与施氮量对烟后晚稻产量构成因素有明显互作效应,较低密度(152 000~200 000穴/hm~2)条件下,有效穗数、穗粒数和产量随密度和施氮量增大而明显提高,而较高密度(210000~300000穴/hm~2)条件下,结实率随施氮量增大而增大,有效穗数、穗粒数和产量随施氮量增大表现先升后降趋势,密度300 000穴/hm~2、施氮90kg/hm~2处理表现最好。
In order to clarify the suitable nitrogen application rate and planting densities of late rice after sowing in tobacco smoke multiple cropping system in Changsha, Fengyunyou 299 was used as material in 2013-2014 in Liuyang, Changsha City, Hunan Province. Study the effect. The results showed that there was no significant relationship between density and LAI of rice during the whole growth period of late rice due to nitrogen application. The LAI of rice increased with the increase of N application rate and density, but there was an interaction effect between N rate and density. The SPAD value of post-tobacco late rice increased significantly due to nitrogen application and had little to do with the density. Among the components of rice yield, the 1000-grain weight was stable without significant changes in density and nitrogen application rate. The density There was a significant interaction effect between N application rate and N application rate on the yield components of late rice afterwards. Under the conditions of low density (152 000 ~ 200 000 holes / hm ~ 2), the effective spikes, grains per spike and yield were positively correlated with the densities and N rates (210000 ~ 300000 holes / hm ~ 2), the seed setting rate increased with the increase of nitrogen application rate, the number of effective panicle, grains per spike and yield increased with the application of nitrogen The performance increased first and then decreased, the density of 30000000 holes / hm ~ 2, nitrogen application of 90kg / hm ~ 2 the best performance.