Analysis on Main Nutrient Characters of Tobacco-planting Soils in Tongren Region

This article studied the properties and nutrient status of different tobacco-planting soils in Tongren region of Guizhou province,the results indicated that the pH-value was in the appropriate scope,the content of organic matter was rich,the content of available potassium was above the normal level,the content of available nitrogen was lower,the phosphorus was lacking and the contents of exchangeable Ca and Mg were rich.The principle measures to regulate the nicotine content in tobacco leaves included the selection of weak acidic soil with moderate organic matter content,the control of nitrogen fertilizer application and the increase of phosphate fertilizer application.