Tobacco cultivation <p>Though it is not easy to cultivate tobacco, this culture is grown successfully in different climatic conditions and in different types of soil. With this environmental factors have considerable influence on quality of tobacco. In particular, soil defines the size, texture and color of leaves. On loamy soil and clay sand with weak water holding ability and low content of soluble mineral salts tobacco leaves usually turn out to be light, big, with law thickness, thin texture and faint flavor. On limous and clay soils tobacco leaves are smaller, darker, and thick, and have pronounced flavor. But climatic conditions also influence the flavor of tobacco.</p> <p>Thus, for successful tobacco production one should take into consideration all these factors, and also a number of labor force, good drainage, prolificacy of soil and its rich additional fertilizing. In main tobacco cultivation USA regions firstly people get seedling from common tobacco seeds, and when nurslings height is 10&#8208;15 cm, they are transplanted into the fields. Later on, the soil is regularly cultivated for weed control, and after buds appear, shoots and accessory buds are removed to stimulate the leaves growth. In order to make tobacco leaves thin and elastic, necessary for cigar producing, common tobacco is usually cultivated in shadow, created by wooden strips or fabric, fixed on frames on vertical columns. Shading helps to keep homogeneous temperature and moisture.</p> <p>At different stages of tobacco development, prophylactic measures for weed control are required. Leaves are damaged by tobacco beetle. To avoid this, it is necessary to execute thermal and chemical sterilization of soil, insecticidal treatments and use persistent sorts of tobacco.</p> <center><img src=http://gzt.ru/img/20070729213635.jpg></center>