Main Nutrients in and Fertilization Solutions to Soil of Fujian Tobacco-growing Area

The nutrients in 557 soil samples collected from 3 regions of Fujian tobacco-growing areas (Sanming, Longyan and Nanping) in 2005 were analyzed. The results showed that the soil types of most samples were clay loam, loam and sandy loam with average cation exchange capacity of 11.55±3.05 cmol/kg, their average pH value was 5.59±0.44, only 43.45% of the samples were acidic. The organic matters and available nitrogen in soil were rich, the average contents of organic matters, total N and alkali-hydrolyzable N were 34. 00±9. 24 g/kg,1.75±0.54 g/kg and 173.6±42. 3 mg/kg, respectively. The organic matter contents in 43.09% of the samples were over 35 g/kg; the average content of available P was 46. 3±32.6 mg/kg, however, it was not uniformly distributed with a coefficient of variation of 70. 3%, the available P contents in 51.7% of the samples were over 40 mg/kg while those in 7. 18% of the samples lower than 10 mg/kg. The supply K was still seriously insufficient, the average contents of slow-release K and available K were 310. 2±208.7 mg/kg and 62. 3±31.9 mg/kg, respectively; only 2. 15% of the samples in which available K content was over 150 mg/kg. The suggestions for fertilization were:applying N restrictedly, applying more K and less P; as for acidic soil, dolomite lime applying every other 1 or 2 years was recommended.