Study on Contents of Boron,Zinc and Molybdenum in Tobacco-planting Soil and Tobacco Leaves in Pingdingshan City,Yexian County

[Objective]The research aimed to measure available boron,zinc,molybdenum contents in soil and B,Zn,Mo contents in leaf samples. [Method]In 2012,the sampling and analysis-testing means were adopted,and tobacco-growing soil and tobacco leaf samples in Pingdingshan City,Yexian County,were collected. [Result]The areas of tobacco-planting soil boron deficiency in Yexian County was 42.86%. In Gong Dian,Ye Yi,Shui Zhai and Xian Tai,leaf boron deficiency was more serious. Tobacco-growing soil in Yexian County showed the extreme zinc deficiency condition,wherein,soil available Zn contents of Gong Dian,Ye Yi,Xia Li,Xian Tai,Long Quan,and Lian Cun were very little. Mo deficiency of Yexian County tobacco-planting soil was 28. 57%,and soil available molybdenum content in Hong Zhuang Yang and Lian Cun was the lowest. The average boron content in Yexian County tobacco was 27. 51 mg /kg,and the lowest boron content of tobacco leaves was in Deng Li. The average zinc content in Yexian County tobacco was 19. 11 mg /kg,and the lowest zinc content of tobacco leaves was in Hong Zhuang Yang,Shui Zhai and Ye Yi. The average molybdenum content in Yexian County tobacco was 0. 27 mg /kg. Among them,tobacco molybdenum content of Long Quan and Xia Li was the lowest. [Conclusion]The study had certain theoretical and practical significance for the reasonable application of trace element fertilizer to increase yield and quality of tobacco leaves in Yexian County flue-cured tobacco production.