研究烤烟不同施氮量、打顶留叶处理的叶层产、质效应，探讨在育苗移栽条件下，烟草植株最优产、质叶位和低产劣质的脚叶位的相对定位规则。研究结果展示，打顶较早、留叶数较少的处理，可提高烟株脚叶位以上的烟叶产、质档次，从而增加高产优质叶位的比率特性，可作为烤烟优质丰产栽培的生物学基础。在留叶数较少的条件下，最优产、质叶叶位的顶向化趋势，则可作为优质烟产质分位的生物学基础。 To study the yield and quality effects of leaf layers under different nitrogen application rates and leaf top leaves treatments, the relative positioning rules of leaf plantlets of tobacco plants with optimal yield, quality leaf position and low yield and poor quality under the condition of transplanted seedlings were studied. The results showed that the earlier stubble and the smaller number of leave leaves could increase the yield and quality of the tobacco leaves above the foot leaf position of the tobacco plant so as to increase the rate characteristics of high yield and high quality leaf position and could be used as a high quality and high yield cultivated organism Fundamentals of learning. Under the conditions of less leaf number, the top trend of the optimum yield and leaf position could be used as the biological basis for quality niche quality niche.