两段留叶技术对烤烟上部烟叶质量的影响

Effects of Two-step-leaf Remaining on Upper Leaf Quality in Flue-cued Tobacco

以烤烟品种K 326为试验材料,设计6个两段留叶处理与常规打顶留叶比较试验,结果表明：两段留叶处理能增加主茎烟上部叶片长、宽,其杈烟的长、宽在57.40~65.33 cm和22.53~24.53 cm之间,比主茎叶片减小;两段留叶有4个处理降低上部烟叶比例作用明显,较对照降低0.49~6.67个百分点;两段留叶处理对主茎烟上部烟叶的还原糖和总糖影响不大,但可明显降低主茎上部烟叶植物碱含量,总氮也有一定程度的降低,钾含量无规律性变化;两段留叶处理的上部烟叶外观质量有较大提高;烟叶产量随着总留叶数的增加而增加,其中主茎18和16片叶打顶杈烟留8片叶的产量分别比对照提高10.28%和3.33%;但两段留叶处理的烟叶产值、均价、中上等烟比例和上等烟比例均比对照有不同程度的降低。

The effects of two-step-leaf remaining techniques on the agronomic characters,upper leaf quality and economic traits were investigated by using K326 as the tested variety.The main results were as follows： remaining 16 and 18 leaves on the main culm and raising 4~8 branch leaves would increase the leaf length and width on the main culm;the length of branch leaves were 57.40~65.33 cm,and the width were 22.53~24.53 cm.The treatments with raising branch leaves had good effects on decreasing the upper leaf ratio by 0.49~6.67 percent.There were no significant differences in total sugar and reducing sugar content of upper leaves among different treatments,but the nicotine content decreased significantly.Compared with the CK,the leaf yields under the treatments with 16 main culm leaves ＋8 branch leaves and 18 main culm leaves ＋ 8 branch leaves were increased by 10.28% and 3.33%,respectively.But the output value,average price,fine leaf ratio of the treatments were decreased contrasted to the CK variety.