Table 4 Relativity between yield and chemical compositions of tobacco leaves and major ecological factors.

From: Climatic factors determine the yield and quality of Honghe flue-cured tobacco

 

Clay (%)

pH

SOM (g/kg)

AN (mg/kg)

AP (mg/kg)

AK (mg/kg)

SCL (mg/kg)

FR (mm)

FT (℃)

FS (h)

FH (%)

Yield (kg/ha)

       

− 0.548**

0.185**

0.535**

− 0.394**

Proportion (%)

    

− 0.169**

   

0.128*

  

Left leaves

  

− 0.139*

        

PTN (%)

       

− 0.130*

  

− 0.149*

PN (%)

        

0.203**

0.128*

− 0.201**

PTS (%)

 

− 0.133*

         

PRS (%)

 

− 0.126*

 

0.145*

   

− 0.135*

 

0.201**

 

PTK (%)

 

− 0.411**

 

0.150*

  

0.152*

− 0.333**

0.274**

0.346**

− 0.321**

PCL (%)

− 0.127*

     

0.216**

0.133*

− 0.195**

− 0.213**

0.202**

PPE (%)

− 0.243**

− 0.174**

− 0.200**

   

0.167**

− 0.288**

0.385**

0.294**

− 0.329**

PS (%)

       

0.134*

− 0.210**

  

PSA

        

− 0.150*

 

0.171**

PNA

        

− 0.237**

 

0.185**

  1. Soil clay content (clay), soil pH (pH), soil organic matter (SOM), soil alkali-hydrolyzed nitrogen (AN), soil available phosphorus (AP), available potassium (AK), soil chlorine content (SCL), and the rainfall (FR), temperature (FT), sunshine hours (FS) and relative humidity (FH) in the field time (from May to August). The yield is the weight of leaves samples; Prop is the proportion of superior middle tobacco (both middle and superior grades); Left leaves is the number of remaining effective leaves after removing the lowest leaves (lugs) and the apical meristem of flue-cured tobacco. PTN the total nitrogen content, PN the nicotine content, PTS the total sugar content, PRS the reducing sugar content, PTK the content of potassium, PCL the chlorine contents, PPE the petroleum mether content, PS the content of starch, PSA the ratio of total sugar to total alkaloids and PNA, the ratio of total N to total alkaloids. Asterisks denote statistically significant Pearson correlation analysis.
  2. *,**P value ≤ 0.05, 0.01 level (bilateral), respectively.
Back to article page