关键词: 曲靖中海拔红壤区, 烤烟, 锌含量, 土壤, 影响因素

Abstract: In order to clear and definite the distribution of tobacco zinc content in mid-altitude red earth area in Qujing city, this paper studied 604 tobacco samples in this area about their distribution of tobacco zinc content and its relationship with soil available zinc content, pH, organic matter and available P content using field investigation and laboratory analysis method. The results showed that: ① The zinc content in tobacco leaves in mid-altitude red earth area in Qujing city was high, averagely ranging from 16.66~109.89 mg/kg with the mean of (46.35±16.43) mg/kg, and there were 94.54% of the zinc content in tobacco leaves suit with the standard in China. There were significantly differences in zinc content of flue-cured tobacco leaves produced in different areas. The order of zinc content in main tobacco cultivars were Hongda>Yunyan 87>Yunyan 85>Yunyan 97>K326. ② The zinc content in flue-cured tobacco leaves was highly correlated with soil available zinc content, the zinc content in tobacco leaves was significantly different among different groups at the P<0.05 level. ③ The zinc content in flue-cured tobacco leaves were greatly affected by soil pH, organic matter and available P content, and were negatively correlated. Thus, the available zinc content, pH, organic matter and available phosphorus content in soil could affect the zinc content in tobacco leaves by different degrees, and then affect the quality of tobacco leaves. These results provided references for reasonable adjust and control of zinc content in tobacco leaves, and scientific balanced fertilization.

Key words: mid-altitude red earth area in Qujing city, flue-cured tobacco, zinc content, soil, influencing factor