3Schere H W,Mackown C T.Dry matter accumulation N up-take and chemical composition of tobacco grown with differ-ent N sources at two levels of K[J].Journal of Plant Nutri-tion,1987,10(1):1-14.
4Raper C D,Mc Cants C B.Nutrient accumulation in flue-cured tobacco[J].Tob Sci,1966(10):109.
5Sims J L.Potassium nutrition of tobacco[J].Potassium inAgriculture,1983,43:1023-1043.
