To improve the bulk-cured tobacco quality,the eight-point curing technology was established after a series of studies.The new curing technology included 8 key temperature points(38,40,42,45,47,50,54 and 68 ℃) and the related parameters.When the technology was adopted,leaf yellowing was well harmonized with moisture loss during curing process,which favored the formation and accumulation of aroma substance as well as the degradation and transformation of pigments,starch and proteins,etc.As a result,the ratio of orange leaves,the ratio of high quality leaves,the average price and the smoking quality all increased,while the proportion of unfavorable leaves decreased.The preliminary application of the new curing technology has brought better economic and social benefits.This technology has high potential for wide application.

通过田间试验,在临沂烟区褐土烟田中,设置了不施氮肥(N0)、施氮82.5 kg/hm2(N1)和施氮105 kg/hm2(N2)3个处理,研究不同施氮水平对植烟土壤供氮状况及烤烟质量的影响.结果表明,随着施氮水平的增加,土壤中的硝态氮和铵态氮相应升高,烟株的干物质积累量相应增加.在烟株的整个生育期内,烟株的含氮量呈下降趋势,随施氮水平的增加,下降趋势渐缓.上部叶烟碱随施氮水平增加而增加,中部叶和下部叶中的烟碱则下降.

Based on the parent material of soil formation, the soil developed from calcareous sandstone is the best for good quality tobacco leaf production. Based on the soil types drab soil can produce the best quality tobacco leaves. Based on the development degree of soil, the developing soil can get better quality of tobacco leaves. The tobacco leaves produced in the low-lying land, clammy soil rich in fertilizer and clay usually possess poor quality. The effects of soil types on Zhongyan98, K326, Zhongyan100 varieties are not significant, but on Yunyan85 variety is significant. The relationship of the fertilizer level in soil and potassium in leaf with smoking evaluation is positive correlation. There is a negative correlation between smoking evaluation and chloride contents in tobacco leaf.

Based on the summary of leaf tobacco production in Shandong Province since 1949,the changes of the proportion of leaf tobacco production and its average yields from 1949 to 2003 are analysed,and the countermeasures for sustainable development of leaf tobacco are also put forward.