1996～1997年连续二年进行了固定氮素用量，改变铵态、硝态氮肥的施用比例试验，对烤烟的一些光合生理特性进行了研究。
Some photosynthetic characteristics in Flue cured tobacco were studied in a field experiment conducted during 1996 ~ 1997 with the application of fixed nitrogen levels and various proportions of different nitrogen forms .
铵态硝态氮肥