Relationship between the available zinc content in soil and the zinc content of flue-cured tobacco in Enshi tobacco-growing areas

Distribution of the available zinc content in soil and the zinc content of flue-cured tobacco in Enshi tobacco-growing areas of Hubei province and their relationships were analyzed in field survey and laboratory experiments.The results indicated that:(1) The available zinc content in soil in Enshi tobacco-growing areas was low,ranging from 0.17 mg·kg-1 to 2.49 mg·kg-1with the mean of(1.00±0.51)mg·kg-1 and the variation coefficient of 54.26%,62.79% of 129 soil samples,for the available zinc content,were below the threshold of 1.0 mg·kg-1,and part of the growing-areas were zinc deficiency.Significant differences were not found among the different altitudes,indicating the trends of high altitudemiddle altitudelow altitude.(2) The average zinc content of flue-cured tobacco was(29.18±7.99) mg·kg-1,ranging from 15.40 mg·kg-1to 54.73 mg·kg-1and the variation coefficient of 27.38%.The coincident frequency for Brazil's(10.15~31.64 mg·kg-1) was 63.79%.There existed significant differences among various cultivars,different altitudes for the zinc content of flue-cured tobacco,nor different gradings.They showed the trends of K326Yunyan87Yunyan85,the trends of high altitudemiddle altitudelow altitude,and the trends of B2FC3FX2F,respectively.(3) The zinc content of flue-cured tobacco and the available zinc content in soil both increased with the altitude height going up.Moreover,the zinc content of flue-cured tobacco increased with the available zinc content going up.