Abstract:

In order to better realize the status and its dynamic variations of principal nutrition in Nanping tobacco-growing soil, and to provide the basis for soil conservation and tobacco balanced fertilization. The status and variations of soil nitrogen, phosphorus and potassium were analyzed base on the data of the soil survey of Nanping tobacco-planting area. The results showed that the average content of total nitrogen, phosphorus and potassium in Nanping tobacco-growing soil were (1.61±0.47) g/kg, (0.57±0.31) g/kg, and (16.34±6.31) g/kg respectively, the average content of alkali-hydrolyzable nitrogen, available phosphorus and potassium were (146.05±38.76) mg/kg, (28.80±26.11) mg/kg, and (90.02±52.12) mg/kg respectively. The variation of the soil phosphorus and potassium was great; the variation of nitrogen was medium. There were positive correlations between the soil alkali-hydradyzble nitrogen content and the texture, the organic matter and the nitrogen content, the available phosphorus, pH and the total phosphorus content. The content of available potassium had extremely significant positive correlations with pH, texture, organic matter, total potassium and the content of slow-release potassium. The nitrogen and potassium supply of soil showed a lower tendency, but the phosphorus supply of soil showed a higher tendency, especially for the old tobacco-growing areas which were long-term continuous tobacco-planting. Considering the soil conservation and quality tobacco production, the flue-cured tobacco production in Nanping should apply dolomite to increase the pH of soil, apply more organic matter and K fertilizer, control the content of nitrogen at current season, and reduce phosphate fertilizer generally, but the phosphate fertilizer application shall be regarded when the content of the available phosphorus was less than 10mg/kg.