施用不同的有机肥，对降低烤酒中部叶片硝态氮含量有一定作用，但上部叶的硝态氮含量有所提高。
Nitrate and nitrite contents could be decreased for middle but increased for uppers in flue cured tobacco leaves by applying different organic manures.
根据烟草公司对来自从这些试验的上部烟叶的评估，成熟度和最上部叶的分次采收对顶叶等级的产生影响最大。
Based on tobacco company evaluations of upper-stalk tobacco from these trials, ripeness and separation of the uppermost leaves had the greatest effect on tip grade production.
为了评估品种、氮用量、打顶高度和上部叶分次采收对生产顶叶等级的影响，从2002 - 2004年进行了研究。
Research was conducted from 2002 through 2004 to evaluate the effects of variety, nitrogen rate, topping height, and separation of the upper-stalk tobacco at harvest on production of tip grades.
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