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中文摘要：
以豫中烟区主栽品种中烟100为试验材料，通过大田试验研究了腐熟小麦秸秆用量对烟田土壤容重及烤烟根系生长分布的影响。结果表明：（1）添加腐熟的小麦秸秆可以有效降低土壤容重，增加土壤持水能力，且随着秸秆用量的增加土壤容重呈降低趋势。（2）烟草根系在水平方向上主要集中在距离茎基部0～10 cm的土层中，垂直方向上主要集中在距离茎基部0～30 cm的土层中。根干重和根体积在移栽后40～60 d和70～90d增加速度最快；打顶可以有效促进垂直方向上10～30cm处根系生长；添加秸秆不能改变烟草根系的总体分布，但可以有效促进各土层根系的发育状况，尤其对垂直方向20～30 cm、水平方向0～10 cm处的土层根系生长有明显的促进作用。（3）在移栽后60 d以前，随着秸秆用量的增加，根冠比也随之增加。从根系的指标来看，腐熟小麦秸秆的适宜用量在6000～9000 kg/hm^2之间。
英文摘要：
Field experiment was carried out to investigate effect of different rotten wheat straw rates on soil bulk density and root growth distribution of flue-cured tobacco in central Henan province. Results showed that： （1） adding rotten wheat straw can reduce soil bulk density effectively and increase soil water holding capacity and the increased use of rotten wheat straw can result in reduced bulk density. （2） tobacco roots concentrated mainly in the area that 0-10cm away from stem horizontally, and 0-30cm away from stem vertically. The periods when root length and volume increased fastest were 40-60 days and 70-90 days after transplanting. Topping can promote tobacco root growth effectively at 10-30cm depth in vertical direction. Adding different amount of mature wheat straw did not change the overall distribution of tobacco root but can regulate root development status effectively, especially for those 20-30cm away from stem in vertical direction and 0-10cm away from stem in horizontal direction.（3） in the period of 60 days after transplanting,the more rotten wheat straw was applied, the faster the root-shoot ratio increased. The appropriate amount of rotten wheat straw is 6000 -9000kg/hm2.
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