In Hunan Liuyang,with the field trials,the effect of ratio of nitrate nitrogen to ammonium nitrogen(RN) on(agronomical) character,economic and quality of flue-cured tobacco were studied.

• 摘要 在湖南浏阳,运用田间小区试验研究了硝态氮、铵态氮比例(RN)对烤烟田间长势与产量以及部分品质因素的影响。