Effects of Water-retaining Agent on the Physical and Chemical Properties of Topsoil and the Growth and Development of Tobacco Plants in Cigar Tobacco Field in the Semi-humid Area of Southwest Henan
The practical application effect of different dosage of water-retaining agent in the production of cigar leaves in southwest Henan was studied,with a view to providing theoretical basis and technical reference for planting cigar tobacco in semi-humid areas and improving the quality of domestic cigar raw materials.Using the cigar tobacco variety Habanos as the test material,we studied the effects of different dosages of water-retaining agent(CK:0 g/plant;T1:2 g/plant;T2:4 g/plant;T3:6 g/plant)on the physical and chemical properties of topsoil in cigar tobacco fields and the growth and development of cigar tobacco plants.The results indicated that applying water-retaining agent could significantly improve the volumetric moisture content of topsoil,reduce soil conductivity,improve soil organic matter,alkali hydrolyzed nitrogen,available phosphorus,and available potassium content.The application of water-retaining agent increased the plant height,stem girth,and leaf number of cigar tobacco,promoted leaves opening,improved the accumulation of dry matter in cigar tobacco plants.Compared with other treatments,T2 treatment was more conducive to improving the agronomic traits of cigar tobacco plants and promoting dry matter accumulation.With the increase of water-retaining agent dosage,the agronomic traits and dry matter accumulation of cigar tobacco plants showed a trend of first increasing and then decreasing.The application of water-retaining agent could increase the total nitrogen accumulation in cigar tobacco,compared with CK,each treatment increased by 7.69%to 44.65%,at the same time,it also increased the proportion of nitrogen accumulation and distribution in cigar tobacco leaves by 2.46%to 13.47%.The application of water-retaining agent increased the nitrogen absorption efficiency of cigar tobacco by 8.27%—30.45%.In summary,the application of water-retaining agent can improve the physical and chemical properties of topsoil in cigar tobacco fields,alleviate the adverse effects of insufficient soil moisture when planting cigar tobacco in semi-humid areas and improve the dry matter accumulation and nitrogen absorption efficiency of cigar tobacco.When planting cigar tobacco in southwestern Henan,the best effect is achieved when the application rate of water-retaining agent is 4 g/plant.
Cigar tobaccoWater-retaining agentPhysical and chemical properties of soilGrowth and developmentNitrogen
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