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烟草种子很小,在苗床期生长的特点是生长相对量較大而絕对量較小,即每天增重的百分数較高,而增加的重量較少。要培育壮苗,在苗床前期,必須以促进生长速度为主,使光合面积和根系迅速扩大,为后期的健壮生长打下基础;而后期則須以努力保証生长健壮为主,使幼苗积累較多的有机养分和具有强大的根系。培育壮苗的关鍵,在于根据烟苗各个生育时期的特性及其对环境条件的要求,采取积极促进和适当控制的綜合育苗技术措施,使烟株生长正常,防止徒长和早衰。根据本省烟区育苗的情况和存在的问題,应该在充分运用传統的成功經驗基础上,进一步掌握分期播种、稀育壮苗的技术。現就培育壮苗几个主要問題論述如下:
Tobacco seeds are small and grow at the seedbed stage characterized by a relatively large amount of growth with a relatively small absolute amount, ie, a higher percentage of daily gain and less weight gain. To nurture strong seedlings in the early stage, we must promote the growth rate of the main photosynthetic area and the root system to rapidly expand, laying the foundation for the latter part of the robust growth; the latter part of the efforts must be made to ensure vigorous growth, the accumulation of more seedlings Organic nutrients and has a strong root system. The key to nurturing strong seedlings is to adopt the comprehensive nursery techniques and measures that are actively promoted and appropriately controlled according to the characteristics of each seedling period of tobacco seedlings and their requirements for environmental conditions so that the tobacco plants grow normally and prevent leggy growth and premature aging. According to the situation of tobacco seedling nursery area and existing problems, we should make full use of the traditional successful experience and further grasp the techniques of sowing and nurturing young seedlings by stages. Now on the cultivation of seedlings several main issues are discussed below: