引进烤烟品种KRK26烘烤特性研究

为摸清津巴布韦特色烤烟品种KRK26 烘烤特性,以烤烟品种云烟97 为对照,研究了暗箱条件下和烘烤过程中KRK26上部烟叶变黄和失水变化规律及烤后烟叶经济性状。结果表明,暗箱条件下KRK26 变黄速度快,失水速度稍慢,易发生褐变;烘烤过程中KRK26 叶绿素降解速度快且彻底,类胡萝卜素降解相对较慢,类叶比大,变黄速度快,易变黄,变黄特性好,但也易于变褐,不耐烤;烘烤变黄前期和干筋期失水速度快,变黄后期和定色期失水相对稍慢,失水特性中等;KRK26失水速度相对落后于变黄速度,二者协调性稍差,烤后烟叶青杂烟比例较高,易烤性和耐烤性均略差。变黄期采用低温变黄的方法,变黄前期降低干湿球差控制烟叶失水,变黄后期和定色前期增加排湿力度,可调节烟叶失水和变黄协调性,有利于提高KRK26 烘烤质量。

Study on Curing Characteristics of Flue-cured Tobacco Variety KRK26

Leaf curing characteristics of flue-cured tobacco variety KRK26 introduced from Zimbabwe was investigated with a control variety Yunyan97. The changes of yellowing, browning and moisture removal under dark condition, pigment degradation, the rate of water lose during curing process were studied, as well as the economic characters of cured tobacco leaf. The results showed that KRK26 leaf yellowing was faster, water loss was lower, easy to browning under dark condition; The chlorophyll degradation speed of KRK26 was fast, the carotenoid pigment degradation speed was low during curing process, contents of chlorophyll degradation thoroughly after curing, the ratio of chlorophyll and carotenoid was high, the speed of yellowing was fast, the yellowing characteristics was better with easy to browning; dehydration characteristics was medium, the water loss rate was slow in early yellowing stage, while the yellowing rate was relatively fast. The water loss rate became slower in late yellowing stage and early fixing color stage, The coordination of leaf dehydration and yellowing of KRK26 was not very good, easy curing potential and coloring characteristics of KRK26 were less than Yunyan97. The water loss of tobacco leaves should be control in early yellowing stage, while increase in late yellowing stage and early fixing color stage to regulate the coordination of water loss and yellowing, increased its curing quality.