Effects of Two High Absorbent Polymer Water-retaining Agents on Soil and Tobacco Quality in Tobacco Fields
To evaluate the effects of K-PAA and attapulgite PAM on the physical and chemical properties of tobacco-growing soil and the growth and internal quality of flue-cured tobacco in Changning tobacco-growing area of Baoshan. The flue-curing tobacco variety (Nicotiana tabacum L.) HongDa was used as Planting material. Two kinds of Super Absorbent Polymers (SAP) K-PAA and attapulgite PAM were used auxiliary material, and two application methods of Concentrating application and spread application were used. The amount of water-retaining agent was 45 kg/hm2 and 90 kg/hm2, respectively, and nine treatments were set up. The agronomic characters, soil physicochemical properties and conventional chemical components of cured tobacco leaves were measured 45d, 60d and 90d after transplanting, and the sensory quality of cured tobacco leaves was evaluated. After application of SAP, the soil diameter R < 0.25 mm soil aggregate proportion decreased significantly (P<0.05), while the other large granular soil proportion increased, soil available potassium content increased significantly (P<0.05) and significantly (P<0.05) increased soil water content, total sugar and reducing sugar in tobacco leaves decreased significantly(P<0.05), total nitrogen and nicotine content significantly(P<0.05) increased, the chloride ion content in upper leaves dropped significantly (P<0.05). The effects of different SAP, application methods and application amount on tobacco plant growth and tobacco quality were different. In Baoshan Changning tobacco area, the application of SAP can promote the early growth and rapid growth of flue-cured tobacco, coordinate the ratio of glycine and potassium to chlorine in the upper tobacco leaves, and improve the tobacco smoking quality.