关键词: 杀螨活性, 杀螨活性

Abstract:

Good soil quality provides the probability for producing tobacco leaves with high quality. Its soil nutrient content influence the quality of tobacco leaf directly. This paper analyzed 308 soil samples from flue-cured tobacco fields in six main flue-cured tobacco production areas in Pingdingshan city. The characteristics of soil nutrient contents in tobacco fields of each county were analyzed in detail. The results showed that the pH values of 91.23% soil samples were above 5.5 and the average value was 6.93. The average values of organic substance contents was 15 g/kg. The average contents of available nitrogen, phosphorus and potassium were 91.6、12.6 and 108.3 mg/kg respectively .the chorine values of 84.7% soil samples were below 30 mg/kg and the average contents was 21.2 mg/kg. Based on this survey, a recommendation for fertilization in this tobacco production area was put forword: control N rate, increased P rate, supplying K in general.