preliminary analysis on stalk position characteristic of inorganic elements in tobacco leaves in different ecological regions indicated that Cu, P, S, Mo and B contents were higher in upper leaves. Fe, Mg, Si, and Pb contents were higher in lower leaves. Se and Zn contents were higher in upper leaves in south area, but higher in lower leaves in north area. The distribution of Mn, Ca and Cd vary with stalk position, significant difference was noticed between different ecological regions. The stalk position characteristic of inorganic elements in southern tobacco leaves was significant, the average variation coefficient was 29.23%. The stalk position characteristic of inorganic elements in northern tobacco leaves was not obvious, the average variation coefficient was 16.13%. The distribution of Mn and P among stalk positions in Guizhou type leaves tended to northern leaves.

Stalk position character of chemical composition in tobacco leaves among different areas was probed. The result indicated that the stalk position character of component in tobacco leaves from southern China was obvious except reducing sugar. The stalk position character of component in tobacco leaves from northern China was not very obvious relatively except reducing sugar.

中烟99系选用烤烟新品系88-4009与中烟86杂交,杂种F1经花培纯化定向选育而成,2000年12月通过全国烟草品种审定.该品种较耐肥水,田间生长势强,优质烟成熟特征明显,分层落黄好,易烘烤;烤后原烟金黄至桔黄,油分多,色泽鲜亮,化学成分协调,烟叶质量符合目前卷烟工业要求;兼抗黑胫病、赤星病和气候斑点病,耐普通花叶病,比对照品种产量提高5.64%,均价提高8.19%,中上等烟增加5.93个百分点,单位面积产值提高11.28%;是一个品质、抗性、产量、适应性等方面较能兼顾,适宜于黄淮、东北烟区种植的优良新品种.

培育壮苗是烤烟生产的基础，也是一个重要环节。沂水县经过多方考寨研究，本着提高劳动效率和烟苗质量、提高沂水烟叶质烟叶的市场竞争能力，又对烤烟实用新技术(新品种)的推广应用起到了一定的促进作用。

培育壮苗是烤烟生产的重要环节,是实现优质适产的基础.传统育苗播种时多采用拌土撒播,种子用量大,出苗后需要进行多次疏苗、间苗,费种费时,同时延长了播种时间,且烟农在间苗过程中"惜苗"现象较为严重,留苗过密,致使烟苗长势差,生长不均匀,老少苗现象较严重.

目的：研究不同药物配伍对四妙勇安汤中绿原酸、异绿原酸溶出率的影响。方法：用ＴＬＣＵＶ 分光光度法测定了四妙勇安汤分煎液、四妙勇安汤合煎液、金银花水煎液，金银花与方中其余各单味药材配伍水煎液中绿原酸和异绿原酸的含量，并对测定结果作了统计检验。结果：各配伍组水煎液中绿原酸含量均较金银花水煎液显著降低（ Ｐ＜ ０ ．０１） ；与金银花水煎液中异绿原酸含量相比，全方合煎液中异绿原酸含量无显著性差异，而其余各配伍组水煎液中则显著降低（ Ｐ＜ ０ ．０１） 。结论：方药配伍是四妙勇安汤中绿原酸、异绿原酸溶出率发生变化的主要原因之一。