广西玉林是冬烤烟产区,但产量较低,品质较差。为了探索提高冬烤烟质量的途径,1982年我们设计了冬烤烟栽培正交试验,了解施肥量、种植密度及单株留叶数对冬烤烟产质的影响。通过试验初步认为,在玉林地区种植冬烤烟,对中等肥力的地块,以亩施纯氮8—11斤(氮磷钾比例为1∶1∶2),密度1900—2100株,单株留叶19—21片为宜。试验材料及方法供试品种是提纯401。试验采用正交设计法,用 L_9(3~4)正交表,因素与水平见表1。小区面积0.02亩,3次重复,随机排列,试验方 Yulin, Guangxi winter flue-cured tobacco production areas, but lower yields, poor quality. In order to explore ways to improve the quality of winter flue-cured tobacco, we designed orthogonal experiment of winter flue-cured tobacco in 1982 to understand the effects of fertilizer amount, planting density and the number of leaves per plant on the quality of winter flue-cured tobacco. Preliminary experiments that the cultivation of winter flue-cured tobacco in Yulin, moderate fertility plots to Mushi 8-11 pounds of pure nitrogen (NPK ratio of 1: 1: 2), the density of 1900-2100 plants, single plant stay 19-21 tablets is appropriate. Test materials and methods The test varieties are purified 401. Orthogonal design test method, with L_9 (3 ~ 4) orthogonal table, factors and levels in Table 1. The plot area of ​​0.02 acres, 3 repetitions, random arrangement, test side