摘要
通过在营养液中加入硒矿粉的方法,研究了不同硒矿粉用量对烟苗光合特性、成苗素质及硒积累的影响。结果表明,苗期施用硒矿粉能促进烟苗生长,随着施用量的增加,烟苗的叶绿素、可溶性糖、根系活力和硒含量明显增加。低用量的硒矿粉提高了烟苗的净光合速率(Pn),可能增加了叶绿素含量和减少了气孔限制是重要原因;高用量的硒矿粉导致烟苗Pn下降,主要是由气孔因素决定的。在本试验条件下,适宜的苗期硒矿粉用量为24.6 kg/hm2。
Effects of different rates of selenium ore powders on physiological characteristics, qualities and selenium accumu- lation of tobacco seedling were studied by applying selenium ore powders in the nursery pond during seedling stage. The re- sults showed that it significantly improved the growing, chlorophyll, soluble sugar content, root activity and the selenium content of tobacco seedling with the using of selenium ore powders. The rising of chlorophyll and droping of stomatal limita- tion were probably the reasons of increasing net photosynthetic rate by applying of selenium ore powders in low dosage and the decreasing of net photosynthetic rate was probably determined by stomatal factors under high dosage. Under the conditions of this study, it was proper to applying selenium ore powders of 24. 6 kg per hectares during seedling stage.
出处
《中国土壤与肥料》
CAS
CSCD
北大核心
2013年第2期89-93,共5页
Soil and Fertilizer Sciences in China
关键词
硒矿粉
烟苗
生理特性
硒积累
selenium ore powders
tobacco seedling
physiological characteristic
selenium accumulation
