1. Seed to smoke
From seed to smoke the culture,manufacture and use of tobacco involves a continuous chain of events. Each step in those events representsa single link of the long chain,and each link is of equal significance.Weakening of any single link produces a product...查看详细>>
标签:英汉烟草科技2.The Origin of Nicotiana tabacum
The origin of N. tabacum has been a challenging problem for manyplant scientists. Although it is now the most commonly grown commercialtobacco species,N. tabacum does not occur naturally in the wild state.One hypothesis is that N. tabacum arose from an in...查看详细>>
标签:英汉烟草科技3.The types of tobacco
The different types of tobacco differ in where and how they aregrown,how they are prepared for use in cigarettes,and what characteristics they impart to the smoke. Since tobacco is a natural product,it issubject to wide variations in properties within a g...查看详细>>
标签:英汉烟草科技4.Comparison of tobacco types
A summary of the major chemical characteristics of the principal tobacco types is given in Table 4. 1. The descriptive words used are intended to give a relative ranking with regard to a property and are notmeant to represent an absolute level. For instan...查看详细>>
标签:英汉烟草科技5. Stalk positions and chemical distribution
Even within the same plant,leaves from different stalk positionsshow a definite pattern of chemical distribution. For example,total nitrogen and nicotine contents increase with higher stalk position,but reducing sugars are higher in the middle position as...查看详细>>
标签:英汉烟草科技6.Adequate fertilizer level
Only at adequate fertilizer levels,particularly N,can leaf tobaccobe produced for good quality and usability. A comparison of fertilizerrates on several critical leaf components was made of four plant positionsof flue-cured tobacco. The result shows,under...查看详细>>
标签:英汉烟草科技7.Topping and suckering
Topping is a decapitation process in tobacco culture practiced by removing blossoms and sometimes the top leaves of a plant in order to stimulate growth and development of remaining leaves for desired quality. Topping prevents the development of the seed ...查看详细>>
标签:英汉烟草科技8.Sucker growth regulation
Topping,a common practice in tobacco production,is an operationof removing terminal inflorescence and sometimes several top leaves in order to redirect the energy for leaf development to a desired physical andchemical property. Subsequently,because of the...查看详细>>
标签:英汉烟草科技9. Maturity and harvesting
The metabolic activities in tobacco leaves during growth,maturationand senescence are continuous processes and shift gradually from onestage to the next. Intensive growth ceases in coincidence with decliningnitrogen uptake and reduction and the onset of s...查看详细>>
标签:英汉烟草科技10. The importance of leaf ripeness
One of the most important factors in the production of high qualitycured leaf is the harvest of ripe tobacco. No amount of skill in flue - curing can make up for the failure to harvest tobacco at the proper stage ofleaf maturity. The terms ripe and ripene...查看详细>>
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