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1985-1990年间，我们在长白县及公主岭进行的四次NPK三要素试验中，发现氮肥抑制了人参生长发育，降低了产量（5％显著水准），而倍量氮肥，减产达1％显著水平。继续研究证明，人参硝酸还原酶活力（NRA）甚低，追施氮肥使组织，积累，促进了呼吸作用，植株干物中N、Si及Cu、Zn、Fe、Mn含量增加，Ca、Mg、K、Na等阳离子减少，表现出氮毒征象。本文称氮过剩症，它是指氮素供应超过了由极低NRA催化的转化代谢速率，而引起的一种毒害现象。
From 1985 to 1990, we found that NPK inhibited the growth and development of ginseng and reduced the yield (5% significant level) in the four NPK tripartite tests carried out in Changbai County and Gongzhuling, and the significant reduction of 1% . Continued studies have shown that ginseng nitrate reductase activity (NRA) is very low, topdressing nitrogen fertilizer to make organizations, to promote the respiration, plant dry matter N, Si and Cu, Zn, Fe, Mn content increased, Ca, Mg, K , Na and other cations decreased, showing signs of nitrogen toxicity. This article refers to nitrogen excess, which refers to a toxic phenomenon caused by nitrogen supply exceeding the rate of metabolic conversion catalyzed by very low NRA.