海藻酸和磷酸二氢钾对烟草花期和烟叶品质的影响差异

为探讨高海拔烟区在植烟期易发生冷害、导致烟草早花的问题，采用抗冷剂海藻酸和磷酸二氢钾处理烟苗，对烟草的现蕾时间、烟叶品质和产量进行了研究。结果表明：喷施海藻酸可延迟现蕾期约8天；磷酸二氢钾最多延迟现蕾期5天。喷施海藻酸和磷酸二氢钾对烤烟致香成分的总量影响不大。但在产量方面，海藻酸处理获得了2100 kg/hm2的最优产量，比对照增产16.67%；中上等烟比率占97.80%，高于对照3.7个百分点。

Different effects of alginic acid and KH2PO4 on flowering time and leaf quality of tobacco

In order to research the early flowering caused by cold in high latitude tobacco field, alginic acid and KH2PO4, both increase cold resistance of plants, are used to spray tobacco leaves to investigate flowering time, leaf quality and quantities. Results showed that alginic acid and KH2PO4 delayed flowering time of tobacco 8 and 5 days, respectively. The total contents of aroma components in flue-cured tobacco leaves are not obviously affected by both treatments. The maximum production is got from alginic acid treated field, and the quantity is 2100 kg/hm2, increase 16.67% than normal field. The medium and fine levels of flue-cured tobacco leaves account for 97.86% of total production, is 3.7 percent higher than normal levels.