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。