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在土壤栽培和水培条件下，利用１５Ｎ示踪法研究了１、３、４年生西洋参吸收利用ＮＨ４＋和ＮＯ３－及其在植株体内的分布。结果表明：水培条件下西洋参从芽苞萌动到叶片展开即可吸收肥料Ｎ，并表现出喜铵现象，两种栽培条件下，植株对ＮＨ４＋的吸收量比对ＮＯ３－的吸收可高出１倍以上，而且此时肥料Ｎ在茎叶中的分布高于在根中的分布；在根生长时期，植株对两种形态的肥料Ｎ均能很好地吸收利用，此时肥料Ｎ在根中的分布高于在茎叶中的分布。土培西洋参植株当年吸收的总Ｎ量８０％以上来自土壤，５％左右来自肥料，其余由母根供给，因此，培肥土壤和培育壮根是提高西洋参产量和质量的重要途径。
In the soil culture and hydroponic culture conditions, the 15N tracing method was used to study the uptake and utilization of NH4 + and NO3- in Panax quinquefolium L. and their distributions in plants. The results showed that Panax quinquefolius could absorb fertilizer N under the hydroponic conditions and germinated like leaves, and showed a hi ammonium phenomenon. Under two cultivation conditions, the uptake of NH 4 + by plant was higher than that of NO 3 - by 1 Times higher, and the distribution of fertilizer N in the stems and leaves was higher than that in the roots. During the root growth period, the plant was well absorbed by both forms of fertilizer N, The distribution is higher than in the stems and leaves of the distribution. Soil cultivated in American ginseng plant more than 80% of the total N absorbed from the soil, about 5% from the fertilizer, the rest from the mother of the root supply, therefore, fertilize the soil and cultivate strong roots is to increase the yield and quality of American ginseng an important way.