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缺氮:烟草缺氮表现叶色浅淡,生长缓慢或停止,下部老叶变成柠檬或橙黄色,并逐渐干枯脱落,其余叶片向上直立,与茎的角度变小。烟叶产量是随施氮量的增加而增加,但烟叶品质则随施氮量的增加而下降,因此烟草的氮肥应合理施用,在施足基肥的基础上,早追氮肥。如基肥氮素不足,应及早于栽后25天培垄时667m~2施复合肥10～15kg或硫铵、硝铵5～7.5kg,避免过迟施入。 缺磷:往往出现在栽后第一个月,表现生长缓慢,植株矮小,叶色暗绿,叶形窄长而上翘,下部叶片出现小斑点。作烤烟用的烟草,烤后呈深棕色或青色,缺乏光泽,质量低劣。出现此症状,应及时追施
Nitrogen deficiency: Tobacco nitrogen deficiency showed pale, slow growth or stop, the lower part of the old leaves into lemon or orange, and gradually dry off, the remaining leaves upright, and the angle of the stem becomes smaller. The yield of tobacco leaf increased with the increase of nitrogen application rate, but the quality of tobacco leaf declined with the increase of nitrogen application rate. Therefore, the nitrogen fertilizer of tobacco should be rationally applied. Such as the lack of basal nitrogen, should be as early as 25 days after transplanting Ridge 667m ~ 2 fertilizer compound fertilizer 10 ~ 15kg or ammonium sulfate, ammonium nitrate 5 ~ 7.5kg, to avoid the late application. Phosphorus deficiency: often occurs in the first month after planting, the performance of slow growth, plant dwarf, dark green leaves, narrow and long leaf shape upturned, the lower leaves appear small spots. Tobacco for flue-cured tobacco, dark brown or blue after baking, lack of luster, poor quality. Appear this symptom, should be chased in time