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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。
The effects of humic acid and iron sulfate on the improvement of soil pH, soil fertility and tobacco agronomic traits were analyzed by field experiments using humic acid and humic acid together with ferric sulfate in partial-alkali soil. Field effect. The results showed that: (1) The combination of humic acid and humic acid + ferric sulfate reduced the soil pH by 0.06 and 0.21 respectively, which was better than humic acid . (2) The combination of humic acid and humic acid + ferric sulfate all played an important role in improving soil fertility. Humic acid increased soil alkali-hydrolyzable nitrogen content by 9.0% compared with the control. Combined application of humic acid and ferric sulfate made the content of organic matter, Compared with the control, the available iron content increased by 19.6%, 10.5% and 41.7%, respectively. The combined application of humic acid and ferric sulfate increased the iron content in leaves by 13.0%. (3) The combination of humic acid and humic acid + ferric sulfate had little effect on tobacco plant height, maximum leaf length, maximum leaf width, effective leaf number and dry weight, but had no significant effect on tobacco growth.