Effects of fertilization time and amount of potassium on yield and quality of flue cured tobacco were studied in field experiments.The results read as follows:The fertilizer effect of two potassium levels (K 2O 270 and 330 kg/hm 2) hasnt obvious difference and D 3 (60 days after transplanting) among three fertilization time is optimum.But integrated surveying the fertilizer amount and time,the fertilizer effect of G 1D 3 is supreme.Not only is it tobacco yield and the proportion of first class or medium class tobacco and the output value is s...