Abstract:

In order to investigate the soil fertility situations to provide the theory basis on soil improvement and balanced fertilization in main tobacco-growing areas of Panxian region Guizhou province, 140 soil samples from 3 main tobacco-growing areas were analyzed. The results showed that the average pH value was 6.12, which was in an appropriate amount for tobacco growth. The contents of organic matter, total nitrogen, total phosphorus were rich in general, 34.38 g/kg, 2.22 g/kg and 1.12 g/kg respectively. But the contents of available nitrogen, available phosphorus, total potassium and available potassium in the medium to low levels, 39.27 mg/kg, 8.78 mg/kg, 9.69 g/kg and 139.98 mg/kg respectively. The contents of soil exchangeable calcium and exchangeable magnesium were 1147.88-5854.67 mg/kg, 46.66-708.17 mg/kg respectively, both of them were higher than the critical index. The range of soil available zinc content was 0.57-5.55 mg/kg, 94.29% of the samples was higher than the critical index (<1.00 mg/kg). The range of water-soluble chloride content was 7.43-39.23 mg/kg, and 95.71% of soil samples was lower than the critical index (30.00 mg/kg). The range of soil available molybdenum content was 0-0.59 mg/kg, and 80.00% of soil samples was higher than the molybdenum critical index (<0.10 mg/kg). The range of soil available boron content was 0.17-1.25 mg/kg, and 68.57% of samples below the boron critical index (<0.50 mg/kg). It was suggested that controlling nitrogen fertilizer, supplying phosphorus and potassium fertilizer and increasing molybdenum and boron fertilizer should be paid more attention in balanced fertilization in Pan xian tobacco-growing areas.