腐植酸和硫酸铁配施改良偏碱烟田土壤的研究

Improvement of Alkaline Tobacco Field Soil by Combined Application of Humic Acid and Ferric Sulfate

采用田间试验方法,在偏碱烟田中施用腐植酸以及配施腐植酸+硫酸铁,分析其对土壤pH、土壤肥力和烟草农艺性状的影响,研究腐植酸及与硫酸铁配施改良偏碱烟田土的效果。结果表明:(1)腐植酸以及腐植酸+硫酸铁配施均能降低烟田土壤的pH,使pH分别比对照降低0.06,0.21个单位,二者配施的效果比单施腐植酸更好。(2)腐植酸以及腐植酸+硫酸铁配施均对提高土壤肥力有一定作用,腐植酸使土壤碱解氮含量比对照提高9.0%,腐植酸+硫酸铁配施使有机质、碱解氮和有效铁含量分别比对照提高19.6%,10.5%和41.7%,腐植酸+硫酸铁配施使烟叶铁含量比对照提高13.0%。(3)腐植酸以及腐植酸+硫酸铁配施均对烟草的株高、最大叶长、最大叶宽、有效叶片数和干重影响不大,对烟草的生长未产生明显影响。

A field experiment was conducted in Chenzhou of Hunan.The humic acid and its mixed application with ferric sulfate were fertilized into alkaline tobacco field.The soil pH,soil fertility and tobacco agronomic characters were determined to study the regulative effects of humic acid with ferric sulfate on the tobacco soil.The results were as follow：（1）Humic acid and its mixed application with ferric sulfate both decreased the pH of tobacco soil.Compared with untreated soil,the soil pH of two treatments were decreased by 0.06 and 0.21,respectively.The effect of compound addition was better than single adding humic acid.（2）Humic acid and its mixed application with ferric sulfate improved the soil fertility.Compared with control,the content of alkali-hydrolyzable nitrogen was increased by 9.0% by application humic acid,and the contents of organic matter,alkali-hydrolyzable nitrogen and available iron were increased by 19.6%,10.5% and 41.7%,respectively by combined application of humic acid and ferric sulfate.Fe content of tobacco leaves reached a significant level,and it was increased by 13.0% by combined application of humic acid and ferric sulfate compared with control.（3）After fertilized humic acid and ferric sulfate,there was no obvious impact on agronomic characters of tobacco,which indicated that they had no significant effect on tobacco growth.