The phosphorus accumulation and distribution law in the continuously - cropped flue - cured tobacco under the condition of chernozem natural fertility were studied. The phosphorus accumulation in root system, lower leaves, middle leaves and upper leaves all showed a decreasing trend in harvest time when the continuous cropping years increased. The 3 - year continuous cropping was beneficial to the phosphorus accumulation in stem, but the 5 - year continuous cropping was not beneficial to it. The continuous cropping for 5 years increased the distribution proportion of phosphorous in root system and middle leaves, while decreased that in stem, lower leaves and upper leaves. Comprehensive analysis indicated that the continuous cropping of flue - cured tobacco should not exceed 5 years.%在黑钙土自然肥力下,研究了重茬栽培对烤烟磷积累及分配的影响.结果表明:随着重茬年数的增加,收获时根系、下部叶、中部叶和上部叶内的磷积累量均呈下降趋势；重茬3年有利于磷在茎内的积累,但是重茬5年不利于磷在茎内的积累；重茬5年会使根系、中部叶内磷的分配比例增加,而使茎、下部叶和上部叶内磷的分配比例下降.综合分析认为,烤烟重茬栽培年限不宜超过5年.
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