Relationship between the calcium content in soil and the calcium content of flue-cured tobacco in Enshi tobacco-growing area

Distribution of the calcium content in soil and the calcium content of flue-cured tobacco in Enshi tobacco-growing area of Hubei Province and their relationships were analyzed. The results indicated that: (1) the average content in soil of total and exchangeable calcium was 2124.60 and 1091.44 mg/kg in Enshi tobacco-growing area. The calcium content showed the trends of high altitude > middle altitude >lower altitude among different altitudes, and the trends of 0 to 20 > 20 to 40 > 40 to 60 cm in different soil depths. (2) Significant differences of the calcium content of flue-cured tobacco were found among the different cultivars and grades, indicating the trends of Yunyan87 >Yunyan85 > K326, the trends of X2F > C3F > B2F, and the trends of high altitude > middle altitude > lower altitude. (3) The calcium content in soil and the calcium content of flue-cured tobacco were both increased with the altitude height going up. When the exchangeable calcium content in soil was grouped and increasing, the calcium content of flue-cured tobacco also increased. Linear regression equation was established between the calcium content of flue-cured tobacco and the exchangeable calcium content in soil with high significant correlation coefficient.   Key words: Calcium content in soil, calcium content of flue-cured tobacco, altitude height, relationship analysis, Enshi tobacco-growing area.