Abstract:

605 soil samples were collected and analyzed from 8 tobacco growing counties in Zhaotong. The results showed that the average soil pH value was 6.64, the average contents of organic matter was 2.629%, total N was 0.131%, available N was 107.28mg.kg-1, total P was 0.081%, available P was 15.235mg.kg-1, total K was 1.636%, available K was 140.98mg.kg-1, exchangeable Ca was 0.381%, exchangeable Mg was 319.32mg.kg-1, available B was 0.259mg.kg-1, available Zn was 2.479mg.kg-1, available Mn was 24.444mg.kg-1, available Mo was 0.289mg.kg-1, available Fe was 35.453 mg.kg-1,available Cu was 2.544mg.kg-1, water-solubility chlorine ion was 11.783mg.kg-1. Low soil P, insufficiency of K, and deficiency of available B, water-solubility chlorine ion in tobacco growing soils of Zhaotong were main limited factors for flue-cured tobacco production. The fertilization suggestion of controlling N, increasing P and K, complementing B and Cl generally, complementing Mg, Mo and Zn in some areas was recommended.