叶面喷施外源ABA对烤烟生长及品质的影响

 为探明叶面喷施脱落酸（ABA）对烤烟生长及品质的影响，开展了不同浓度（0，0025，005，0075，010，0125，015mmol/L）的脱落酸条件下烤烟生育期、农艺性状、经济性状和化学成分的研究。结果表明，在005~0125mmol/L范围内，越高浓度的脱落酸水平，生育期缩短的优势越是明显，高于和低于此范围的脱落酸浓度都不利于缩短生育期；喷施010~0125mmol/L脱落酸既有利于烟株的生长发育，又有利于提高产量、产值、上等烟比例和中上等烟比例，且降低了氯含量、蛋白质含量和氮碱比，提高了总氮、总糖、还原糖、钾含量、钾氯比（K/Cl）和施木克值，明显改善了烟叶的品质。因此，浓度为010~0125mmol/L脱落酸的喷施效果最好，但要得出最适宜浓度还要进一步的试验研究。

Effect of Foliage spraying Exogenous ABA on Flue cured Tobacco Growth and Qualities

In order to investigate the effect of foliage spraying abscisic acid（ABA） on the growth and quality of flue cured tobacco, a research of growth stages, agronomic characters, economical characters and chemical composition under different concentration abscisic acid (0,0025, 005,0075,010,0125 ,015mmol/L）was studied. The results showed that in the range of 005 ~ 0125 mmol/L, the higher was the concentration of abscisic acid, the shorter was the growth period. Above or below the concentration range was not advantage for shorten growth period; within 010~0125 mmol/L abscisic acid, the growth, yield, output value, rate of superior1class and rate of superior and secondary class were promoted while the content of Cl, protein and N/nicotine reducing and the content of total N, total sugars, reducing sugars, potassium, K/Cl and shmuck value increasing; the quality was improved obviously. Therefore, 010~0125 mmol/L abscisic acid performed best, but further study of the best concentration is needed.