【正文】 ental tobacco. Cigarettes are not only a blend of different types of tobacco, but are also a blend of stalk positions within the different types of tobacco. Each stalk position contributes different characteristics to the cigarette, and proper blending of tobacco types and stalk positions within types is key to producing quality cigarettes and ensuring uniformity of the final product. 葉片分部位采收美國的混合型卷煙是由幾種類型的煙草組成的，包括烤煙、白肋煙和香料煙。品種在每個試驗地點都對頂葉等級的生產(chǎn)沒有影響。In addition, the uppermost 10 to 12 leaves were harvested together or divided equally into two harvests. Based on tobacco pany evaluations of upperstalk tobacco from these trials, ripeness and separation of the uppermost leaves had the greatest effect on tip grade production. 此外，還對最上部1012片葉一起采收和均分進(jìn)行兩次采收進(jìn)行了比較。 and from $ to $ in 2003. Even though weather conditions in 2002 and 2003 were quite different, the trends in quality were the same. Therefore, when it es to quality, there is no substitute for harvesting ripe tobacco. 從質(zhì)量上看，有一點值得重視，即：隨著采摘從提前7天(未熟)—推遲到成熟后10或20天，每磅的價格幾乎總是上漲。在2003～2004年，煙葉成熟很慢，但由于過多的降雨，煙葉質(zhì)量很快下降。然而，數(shù)據(jù)表明：在美國東南部，氮肥的施用量和施用時間比側(cè)施肥料更重要。 ExpressionsBuyout n. a situation in which a person or group gains control of a pany by buying all of its shares 全部買下、買斷 Postbuyout 買斷后MH maleic hydrazide 順丁烯二酸酰肼，馬來酰肼Alkaloids n. any of numerous organic bases (as morphine) containing nitrogen and usually oxygen that occur especially in seed plants 生物堿Top v. to remove or cut the top of 給……打頂Sucker n. a shoot from the lower part of the stem of a plant 腋芽Stalk n. a long narrow part of a plant supporting one or more leaves,flowers or fruits 柄、梗Nicotine n. a poisonous alkaloid （C10H14N2） that is the chief active material of tobacco and is used as an insecticide 尼古丁Cure v. to preserve by drying it 曬、烘烤Mature a. fully grown and developed 成熟的Hornworm n. a kind of insects 天蛾幼蟲Mo(u)ld n. a superficial growth produced especially on damp or decaying organic matter or on living organisms 霉菌Blue mo(u)ld 青霉病Layby n. the final operation in the growing of a field crop 最后的田間作業(yè)Variegated v. marked in different colored spots,lines,areas etc 雜色的、斑駁的Sidedress v. to apply nutrients on one side of the plant roots 側(cè)施肥Nondescript a. belonging to no particular class or kind 無歸類的。 ●霜霉病更加嚴(yán)重。2002生長季節(jié)與2003和2004生長季節(jié)是兩個相反的極端。處理5所有參試品種的產(chǎn)量和產(chǎn)值均有損失。但是僅靠將最上部葉片分開采收，還不足以生產(chǎn)出具有頂葉等級的理想的化學(xué)和物理特性的煙葉。Removal of four leaves resulted in a 6 percent average reduction in yield and gross value per acre. Removing eight leaves resulted in a 20 percent average reduction in yield and gross value per acre. However,