【摘要】 为了探索烤烟杂交种YY021苗期的需肥特性，为新品种的推广提供数据支持。本研究以YY021的母本MS豫烟13号和父本河洛1号作为对照品种，研究不同施肥量对其苗期叶绿素相对含量(SPAD值)、干物质积累量、养分积累量、根系指标等的影响。结果表明，三个品种的SPAD值、地上部干物质积累量和养分积累量均随着施肥量的增加逐渐增大，根部干物质积累量、根部养分积累量、根冠比及根系指标随着施肥量增加呈先增大后减小的趋势;减半施肥(50 mg/L N)处理，YY021，总根长、总根表面积、总根体积和根冠比处理间最大且干物质积累量、氮磷钾积累量均优于父母本;在正常施肥(100 mg/L N)和过量施肥(200 mg/L N)处理，地上部表现好，干物质积累量和氮磷钾积累量优于父母本。综上所述，苗期减半施肥更有利于根系生长，YY021对氮肥更具敏感性。更多还原

【Abstract】 To investigate the fertilizer requirements of the flue-cured tobacco hybrid ’YY021 ’ during the seedling stage and to provide data support for its promotion,the female parent ’MS Yuyan 13’ and the male parent’Heluo 1’ were used as controls to assess the effects of different fertilizer application rates on relative chlorophyll content( SPAD value),dry matter accumulation,nutrient uptake,and root growth indices. The results showed that the SPAD value,shoot dry matter accumulation,and nutrient uptake of all three cultivars increased gradually with rising fertilizer levels. In contrast,root dry matter accumulation,root nutrient uptake,root-to-shoot ratio,and root growth indices increased initially and then declined. Under the reduced-fertilization treatment( 50 mg/L N),’YY021’ showing the highest total root length,total root surface area,total root volume and root-toshoot ratio,and outperformed both parents in dry matter accumulation and nitrogen,phosphorus,and potassium uptake. Under the standard-fertilization( 100 mg/L N) and excessive-fertilization( 200 mg/L N) treatments,aboveground growth was enhanced,with dry matter and nutrient accumulation again exceeding those of the parental lines. In conclusion,reducing nitrogen fertilization during the seedling stage promotes root development,and’YY021’ showes greater responsiveness to nitrogen levels than its parental lines.更多还原