二氯喹啉酸对烤烟产质量的影响及其经济阈值

Influences of Quinclorac on Yield and Quality of Flue-cured Tobacco and Its Economic Threshold

采用添加系列试验的方法,研究了不同二氯喹啉酸施用剂量对烟株农艺性状、烟叶经济性状以及内在品质的影响。结果表明:二氯喹啉酸主要抑制了烤烟叶片的生长发育;低残留二氯喹啉酸对烤后烟叶的产量、产值的影响较小,而高残留二氯喹啉酸对烤烟产量、产值的影响显著,但两者均显著影响了烤后烟叶的上等烟比例;二氯喹啉酸对烤烟的经济危害允许水平为4.29%,经济阈值为0.055 mg/kg;二氯喹啉酸残留引起烤后烟叶B2F、C3F内的烟碱含量上升,还原糖含量下降,内在化学成分失调,降低了烟叶的工业可用性和安全性。因此,残留有二氯喹啉酸的田块不适宜种植烟草。

The effects of different doses of quinclorac application on the agronomic traits,economic traits and internal quality of tobacco were studied through indoor adding tests. The results showed that： quinclorac mainly inhibited the growth and development of flue-cured tobacco leaves; low residual quinclorac had little impacts on the yield and output value of flue-cured tobacco leaves,while high residual quinclorac had significant impacts on these indexes,and both low and high residual quinclorac significantly affected the proportion of first-class flue-cured tobacco leaves. The permitted economic harm level of quinclorac for fluecured tobacco was 4.29%,and its economic threshold was 0.055 mg/kg. The residues of quinclorac increased the content of nicotine in B2 F and C3 F baked tobacco leaves,reduced the content of reducing sugar,made the intrinsic chemical compositions disordered,and lowered the industrial availability and safety of tobacco leaves. So,it was considered that the field with residual quinclorac was not suitable for planting tobacco.