福建农业学报2016，Vol.31Issue(3)：225-229,5.DOI:10.19303/j.issn.1008-0384.2016.03.003
氮肥用量对烟草群体发育和群体光合的影响
Effect of Nitrogen Fertilizations on Population Development and Canopy Photosynthesis of Flue-cured Tobacco
摘要
Abstract
Canopy photosynthetic capacity is the basis for the yield and quality of flue‐cured tobacco ;and ,nitrogen fertilization is critical in regulating the individual growth and canopy development of the plants .To determine the relationship between the fertilization and the canopy photosynthesis ,3 nitrogen fertilizer application rates ,i .e .,N 75.0 kg · hm-2 (N1 ) ,N 97.5 kg · hm -2 (N2 ) and N 120.5 kg · hm -2 (N3 ) ,were applied on the tobacco cultivation .The effects of the varied fertilizations on the leaf area index (LAI) ,light transmittance (LT ) ,and photosynthesis of K326 tobacco were monitored .The results showed that ,in the course of canopy development , LAI was the highest ,but the distance between leaf tips of adjacent lines (DLT ) and LT was the lowest at the round top stage ;and afterwards ,LAI decreased ,DLT and LT increased as the leaves were harvested .Meanwhile ,the canopy photosynthetic rate was the highest at the same stage ,and LAI in the order of N3 ,N2 and N1 ,with no statistically significant difference found between N 2 and N3 .After the lower leaves were harvested from the plants , LAI of N2 became greater than those of N2 and N3 .Additionally ,the leaf area duration of N2 was the longest among the treatments during the two periods from the round top stage to the lower leaves harvest ,as well as ,from the lower leaves harvest to the middle leaves harvest . The canopy LT of N3 was the lowest , with no significant difference between N1 and N2 ,and the canopy photosynthetic rate and canopy leaf source capacity of N 1 were the lowest with no significant difference between N2 and N3 . The tobacco yield increased with increasing nitrogen application .However ,the proportion of top‐quality tobacco and output value were found to be the highest under treatment N2 .Thus ,an intermediate nitrogen fertilization rate (approximately 97.5 kg per hm2 ) was considered economically appropriate for K326 cultivation at a planting density of 18 , 182 plants per hm2 as used in this experimentation .关键词
烤烟/氮肥用量/群体辐射/群体光合Key words
flue-cured tobacco/nitrogen fertilization/canopy radiation/canopy photosynthesis分类
农业科技引用本文复制引用
张鹏举,赵会杰,蒲文宣,易克,张锦韬,毛辉,汪耀富..氮肥用量对烟草群体发育和群体光合的影响[J].福建农业学报,2016,31(3):225-229,5.基金项目
湖南中烟工业有限责任公司科技项目 （）
