Temporal and Spatial Variability of Soil pH and SOM in Liuyang

In order to investigate the Liuyang tobacco growing areas, soil pH and organic matter spatial and temporal variability and soil pH and organic matter of reasonable control provide a reference to Liuyang City in 2000 and 2014 farmland soil pH and organic matter as the research object, using semivariance and Kriging interpolation method, the county soil pH and organic matter spatio-temporal variation characteristics and the condition of abundance or deficiency were evaluated. The results showed that 14 years with the increase of pH 0.30, an increase of 5.57%, soil organic matter fell 2.89, a decline of 8.89%; 14 years to increase the soil nugget effect that decreased soil available phosphorus spatial structure, enhance the random variability; soil pH appropriate level of area than in 2000 increased 29.07%, the area of low rating than in 2000 reduced 28.59%; organic matter content appropriate area ratio in 2000 decreased 8.39%,high levels of cultivated land area than in 2000 increased 8.15%.Thus, soil pH of tobacco is becoming more suitable for planting tobacco, and soil organic matter is becoming less suitable for planting tobacco, so quicklime should be applied continuously to regulating soil pH, and organic material should be applied according to content of organic matter of different regional.