Crops ›› 2021, Vol. 37 ›› Issue (2): 178-182.doi: 10.16035/j.issn.1001-7283.2021.02.026

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The Relationship between Trace Elements in Tobacco Leaves and Soil pH in Qujing

Zhang Yunping1(), Guo Shanhu2, Zhang Jintao2, Xie Yan3, Yi Ke2, Li Qiang1()   

  1. 1College of Agronomy, Hunan Agricultural University, Changsha 410128, Hunan, China
    2China Hunan Tobacco Industrial Corporation, Changsha 410000, Hunan, China
    3Yunnan Provincial Tobacco Company Qujing Branch, Qujing 655000, Yunnan, China
  • Received:2020-06-16 Revised:2021-02-24 Online:2021-04-15 Published:2021-04-16
  • Contact: Li Qiang E-mail:zyp12135@163.com;zqiangli@126.com

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Abstract:

To explore the influence of soil pH on trace element content of tobacco leaves in Qujing, a total of 3656 soil samples and tobacco leaf samples were collected. The multivariate statistical analysis, correlation analysis, and smooth regression analysis were used to study the relationship between trace element content of tobacco leaves and pH value of soil in Qujing, Yunnan. The results showed that the mean value of soil pH was 6.28. The soil samples with a pH below 5.5 and above 7.0 accounted for 22.62% and 24.45%, respectively. The contents of iron and zinc in Qujing tobacco leaves was high. Boron, molybdenum, and chlorine were at low levels. The optimum proportion of manganese content in tobacco leaves was the highest, and about 70% of the leaf samples were at a moderate level. The contents of manganese, zinc, and chlorine in tobacco leaves were negatively correlated with the soil pH, while the contents of boron, molybdenum, and iron of tobacco leaves were positively correlated with the soil pH. In Qujing tobacco production area, we should pay attention to the abundance and lack of trace elements in tobacco leaves, scientifically and rationally increase boron and molybdenum fertilizers, increase trace elements in tobacco leaves and improve the quality of tobacco leaves.

Key words: Tobacco soil, Qujing, pH value, Trace elements, Flue-cured tobacco

Table 1

Grading standard for micro nutrient elements in tobacco leaves"

元素Element 很低Very low 低Low 中等Medium 高High 很高Very high
Mn (mg/kg) ≤20.0 (20.0~50.0] (50.0~200.0] (200.0~500.0) ≥500.0
B (mg/kg) ≤10.0 (10.0~20.0] (20.0~30.0] (30.0~40.0) ≥40.0
Mo (mg/kg) ≤0.1 (0.1~0.5] (0.5~1.0) ≥1.0 -
Zn (mg/kg) ≤7.0 (7.0~20.0] (20.0~50.0] (50.0~70.0) ≥70.0
Fe (mg/kg) ≤55.0 (55.0~90.0] (90.0~120.0] (120.0~200.0) ≥200.0
Cl (%) ≤0.10 (0.10~0.30] (0.30~0.80) ≥0.80 -

Table 2

Statistical characteristics of trace elements in tobacco leaves"

元素
Element		 均值±标准差
Mean±standard deviation		 变幅
Range		 变异系数
Coefficient of variation (%)		 微量元素各级所占比例
The proportion of trace elements at various levels（%）
很低Very low 低Low 适中Medium 高High 很高Very high
Mn (mg/kg) 145.74±102.29 13.73~853.36 11.99 0.11 9.87 68.65 19.80 1.57
B (mg/kg) 16.13±8.21 0.07~74.41 11.03 21.67 52.47 21.88 3.98 1.52
Mo (mg/kg) 0.26±0.35 0.02~8.01 4.37 0.49 87.84 9.17 2.50 -
Zn (mg/kg) 56.59±31.49 5.29~460.14 55.65 0.03 1.57 46.61 30.92 20.87
Fe (mg/kg) 294.32±174.27 47.90~1575.00 59.21 0.03 2.03 5.85 25.26 66.83
Cl (%) 0.27±0.32 0.02~3.47 118.52 36.28 34.26 22.13 7.33 -

Fig.1

Normal distribution of pH value of soil in Qujing tobacco area"

Table 3

Correlation between trace elements and soil pH in Qujing tobacco area"

项目
Item		 氯
Cl		 锌
Zn		 铁
Fe		 锰
Mn		 硼
B		 钼
Mo
pH -0.071** -0.116** 0.122** -0.292** 0.046** 0.206**

Fig.2

Regression analysis of Mn, Zn and Cl contents in tobacco leaves and soil pH"

Fig.3

Regression analysis of B, Mo and Fe content in tobacco leaves and soil pH"

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