《Table 3 The content of effective nitrogen in soi lof planting tobacco in fu-zhou city》

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

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The content of soil available nitrogen is one of the important basis for determining the amount of nitrogen applied per unit area.Nitrogen has a great influence on the yield and quality of tobacco plants，and the application of nitrogen fertilizer is more complicated and has many influencing factors.Rational application of nitrogen fertilizer can make tobacco plants grow normally，have strong photosynthesis and more dry matter accumulation.As for available nitrogen，the soil with content of less than 65 mg/kg is more favorable for nitrogen regulation[3].There is a large area with high available nitrogen content，which needs to pay attention to the application amounts in flue0cured tobacco production.As shown in Table 3，the available nitrogen content of tobacco-planting soil in the whole city is 25.1-297 mg/kg，with an average of 156.72mg/kg.The overall content is moderately high，and the coefficient of variation is 34.59%，indicating moderate variation.The soil samples with available nitrogen content of less than 65 mg/kg account for 18.18%of the total，soil samples of 65-100 mg/kg account for 13.64%，31.82%for 100-150 mg/kg，and 36.36%of samples with the available nitrogen content of greater than 150mg/kg.The distribution of soil available nitrogen is generally better than that of organic matter.The soil samples with the content of moderate and below levels account for 63.64%，especially soils with available nitrogen content of less than 65 mg/kg，which is more conducive to nitrogen regulation[3].For soils with an available nitrogen content of greater than 150 mg/kg，attention should be paid to controlling the application amount of nitrogen fertilizer.