Abstract:

To clarify the physical characteristics of upper tobacco leaves of ‘KRK26’ variety and their relationship with soil nutrients in Dali tobacco planting areas, the descriptive statistics, simple correlation and canonical correlation analysis were used to study the physical characteristics and correlation with soil nutrients. The results showed that the average thickness of ‘KRK26’ upper leaves was 0.20 mm, the single leaf weight was 12.21 g, the stem content was 24.24%, the leaf density was 74.95 g/cm², the tensile force was 1.38 N and the equilibrium moisture content was 13.35%. Compared to the national average, the thickness was slightly higher, the tensile force was lower, and other indicators were equivalence. There was no significant difference in the thickness, stem content, leaf density and tensile strength of the upper leaves in the four tobacco planting areas. The single leaf weight of Dali City was significantly higher than that of Yongping and Yunlong, but was no significant difference with Yangbi. The equilibrium moisture content of Yunlong was significantly the highest. Simple correlation analysis revealed that the single leaf weight was significantly positively correlated with soil total nitrogen, available phosphorus, exchangeable magnesium and available zinc, and significantly negatively correlated with total potassium and chloride ion. Leaf density was significantly negatively correlated with available potassium. At the same time, both simple correlation and canonical correlation indicated that the moisture content of tobacco leaves decreased with the decrease of soil organic matter, total phosphorus and available potassium in a certain range.

Key words: KRK26, upper tobacco leaves, physical characteristics, soil nutrients, correlation analysis