《Table 2 Mean contents of organic matter, total nitrogen, total phosphorus and total potassium in to

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《Evaluation and Analysis of Nutrients in Tobacco-Planting Soil in Fuzhou City》

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Soil p H is directly related to soil parent material，cultivation system and fertilization structure.The p H value of soil is directly related to various nutrient availability，microbial population composition and activity intensity，root growth and development，tobacco quality and fertilization effect.The suitable soil p H range for flue-cured tobacco is 5.5-6.5（slightly acidic）[3].Studies have shown that unsuitable soil p H can be detrimental to the normal absorption and utilization of soil nutrients by tobacco leaves[4-5]，which further affects the quality of tobacco leaves.As shown in Table 1，the p H values of the soil in the sampling areas range from 4.40 to 8.44，and the average value is 5.34，indicating that the soil is at the overall acidity level with the coefficient of variation of 12.76%.Among them，the extremely acidic soil samples with p H less than 4.5 account for 0.7%，the acid soil samples with p H of 4.5-5.5 account for 74.65%，and the total of both is 75.35%.The soil samples with p H of 5.5-7.0 account for 18.52%，and the soil samples with p H higher than 7.0account for 6.13%.Overall，a considerable majority of tobaccogrowing soils in Fuzhou are in a state of acidity.