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...[继续阅读]

    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...[继续阅读]

    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...[继续阅读]

    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...[继续阅读]

    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...[继续阅读]

    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...[继续阅读]

    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 ...[继续阅读]

    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...[继续阅读]

    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...[继续阅读]

    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...[继续阅读]