Research on the Characteristics of Soil Acidification in the Tobacco-planting Area of Yichang City and Analysis of Its Reason

[Objective] The current situation of the soil acidification in the Yichang city would be alleivated for the improvement of tobacco leaf quality through the adoptability of some measurements.[Method] The in field survey and soil sample laboratory analysis results show: Yichang city emblem acidic soil,strong acid and extremely strong acidic area reached 76.23%,mudstone soil and quartz rock fall in value the same soil,soil pH and cation exchange capacity follow a dependency,soil acidification early available potassium increases late kalium decline.Improper rainfall,fertilization and soil available too high content of sulfur is the main cause of soil acidification,soil pH and effective States follow a correlation,but sulfur soil pH and exchangeable calcium content,exchangeable calcium content and available sulphur into negative correlation.Lime,composting organic fertilizer and fertilizer raw buried alkaline fertilizer can prevent and alleviate soil acidification.