Soil Nutrient Status in Chenzhou Tobacco Planting Areas

We analyzed 734 of soil samples from major tobacco planting counties in Chenzhou.The result indicated that,in Chenzhou tobacco planting regions,soils were slightly alkali,average organic matter content was 42.30 g/kg,which was higher than the average in Hunan province.Soil total N and available N content was relatively high.Soil total P content,on average,was 0.93 g/kg.Soil available P content varied widely,only 20.84% of the samples were in the suitable range(10-20 mg/kg).Soil total K and available K contents were relately low,which increased gradually from south to north and from west to east.Most of tobacco planting areas were B deficiency.Available B content in 91.28% of the soil samples was lower than critical value of 0.30 mg/kg.Available Zn content was relatively high.Available Zn in 52.04% of soil samples was in the suitable range(2-4 mg/kg).Available Mn content in 37.53% of soil samples was higher than 20 mg/kg.Available Cu content in 79.57% of soil samples was higher than 1 mg/kg.Available Fe content,on aveage,was 87.23 mg/kg.Available Mg content in soils from granite was generally low,and tobacco had Mg deficiency.