Effects of New Compound Water-Retaining Agent on Tobacco-Growing Soil Properties and Organic Acid Content of Flue-Cured Tobacco
To explore the effects of different types of water-retaining agents on soil quality and organic acid of flue-cured tobacco,a plot experiment in field was conducted with commercially available water-retaining agent(T1),self-made polyvinyl alcohol water retaining agent(PVA/AA,T2),self-made biochar composite water-retaining agent(PVA/AA/B,T3),self-made potassium humate compound water-retaining agent(PVA/AA/HAK,T4),and no retaining agent application(CK).The effects of different water-retaining a-gents on the physicochemical properties of tobacco soil,and the organic acid content and economic properties of cured tobacco leaves were investigated.The results showed that T4 treatment had better effect,followed by T3,which obviously improved the soil properties and significantly increased the yield and economic benefit of flue-cured tobacco compared with CK.Compared with CK,T4 treatment increased the soil moisture content,available phosphorus,available potassium,alkali-hydrolyzed nitrogen and organic matter in the whole growth period by 16.98％to 29.78％,16.44％to 18.11％,9.59％to 18.08％,15.16％to 25.00％,and 10.45％to 15.98％,as well as the soil urease and sucrase activities increased by 15.72％to 19.93％and 10.10％to 13.80％,respectively.T4 treatment significantly increased the total amount of non-volatile organic acids in to-bacco leaves,and the contents of malic acid and citric acid were increased by 53.68％and 68.29％compared to CK,respectively.Correlation analysis showed that malic acid content was significantly positively correlated with soil alkali-hydrolyzed nitrogen content;oxalic acid content was very significantly positively correlated with soil moisture content.In conclusion,the application of PAV/AA/HAK water-retaining agent could obviously improve soil quality,and increase the total amount of non-volatile organic acids and economic benefit of tobac-co leaves.
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