摘要： 试验采用漂浮育苗方式对K326包衣种子进行了不同浓度营养液对烤烟烟苗生长及生理特性的影响进行了研究。试验设8个处理（以氮含量计算）0，50，75，100，125，150，175，200mg/L。结果表明，播种后30d和35d，随着营养液浓度的增加，烟苗的株高、叶数、一级侧根、二级侧根、根体积和干物质重依次增加；播种后45d和50d，在100~150mg/L范围内烟苗的各生物学性状表现较好。播种后46d，随营养液浓度的增加，NR活性逐渐下降，除此以外，在0~125mg/L范围内可溶性蛋白质含量和NR活性在整个苗期随营养液浓度的增加逐渐上升，超过125mg/L又呈下降趋势；INV活性在整个苗期都呈先降后增趋势，在150mg/L时活性最弱。

关键词: 烤烟, 漂浮育苗, 生长, 生理特性, 营养液, 浓度

Abstract: In 2004,the effects of fertilizer concentration on growth and physiological characteristics of flue-cured tobacco seedlings in the floating system were studied with K326 coated seeds.The treatments (calculated by nitrogen concentration) were:0(no fertilizer),50,75,100,125,150,175and 200mg/L.The fertilizer contains many kinds of microelements,provided by Ye-xian county floating system materials factory.The fertilizer ratio was 20-10-20(N-P₂O₅-K₂O).The results showed that at 30 and 35 days after seedling,with the increasing of nutrient solution concentration,stem length,number of leaves,plant dry weight and the number of first-order and second-order lateral roots of seedlings increased;at 45 and 50 days after seedling,Fertilizer within 100-150mg/L could make a better growth of tobacco seedlings.At 46 days,NR activities decreased with the increasing of nutrient solution concentration,except which,NR activities and the contents of water-soluble protein in the whole period increased with the increasing of fertilizer levels within 0-125mg/L,then decreased over 125mg/L.INV activities decreased from 0-150mg/L,then increased over 150mg/L during the whole seedling period.

Key words: Flue-cured tobacco, Floating system, Growth, Physiological characteristic, Nutrient solution, Concentration

中图分类号: 

• S572.01