施肥量对烤烟烘烤过程中多酚氧化酶活性的影响

发布时间：2019-08-03 20:07:09 来源：文档文库

小中大

字号：

手机查看

施肥量对烤烟烘烤过程中多酚氧化酶活性的影响
作者：李建东孙光伟张丽侯欣于涛
来源：《山东农业科学》2019年第04期

摘要：以烤烟NC102为材料，研究不同的氮肥、磷肥和钾肥施用量对烘烤过程中烤烟各部位烟叶多酚氧化酶活性的影响。结果表明：（1）氮（N）施用量高于5 g/盆对烘烤过程中各部位烟叶PPO活性均有提高作用，低于5 g/盆能够显著降低烘烤过程中中下部烟叶的PPO活性，上部烟叶的PPO活性没有显著降低;（2）磷（P2O5）施用量低于7.5 g/盆，能够有效降低前72 h烘烤过程中的PPO活性，高于7.5 g/盆时各处理PPO活性没有显著变化;（3）钾（K2O）施用量高于15 g/盆，提高下部烟叶的PPO活性，但显著降低烘烤过程中PPO活性的峰值;钾用量高于20 g/盆能显著降低中上部烟叶在变黄后期和定色前期的PPO活性。

关键词：氮磷钾肥;烤烟;多酚氧化酶

中图分类号：S572.010.62文献标识号：A文章编号：1001-4942（2019）04-0089-05

Abstract In the study， the effects of different nitrogen，phosphate and potassium fertilizer application amounts on polyphenol oxidase（PPO） activity of flue-cured tobacco NC102 during baking were compared. The results were as follows. （1） The PPO activity of whole tobacco leaves during flue-curing improved when the nitrogen fertilizer application amount was above 5 g per pot. But that of middle and lower tobacco leaves reduced significantly when the application amount less than 5 g per pot， while the reduction of PPO activity was not significant in the upper tobacco leaves.（2） When the application amount of phosphorus （P2O5） was less than 7.5 g per pot， the activity of PPO could be effectively reduced in 72 hours after flue-curing， but had not significant change between treatments when the application amount was above 7.5 g per pot. （3） The potassium（K2O） application amount higher than 15 g per pot could increase the PPO activity of the lower tobacco leaves，but significantly reduced the peak value of PPO activity during flue-curing. The application amount of potassium fertilizer higher than 20 g per pot could significantly reduce the PPO activities of middle and upper tobacco leaves at the late of yellowing stage and pre-fixation.