From 1997 to 1998,pot experiments had been conducted to study the soil nutrition,physiology and quality of fluecured tobacco .Result showed :treatments with humic acid and cake caused the soil pH have a declining tendency,the plant grew better than CK ,cake +chemical fertilizer and humic acid +chemical fertilizer promoted the root system volume and dry matter weight,and increased the decomposition of chlorophyll in the leaf,so had a good effects on ripeness of the leaf .The chemical components were wellbala...