Effects of Interaction Between Potassium Fertilizer and Gibberellin on Growth and Development of Tobacco Plant and Quality of Upper Tobacco Leaves
[Objective]In order to provide the theoretical support for improving the quality of upper tobacco leaves,the effects of the interaction between potassium fertilizer and gibberellin on growth and development of tobacco plant and quality of upper tobacco leaves were explored.[Method]Taking Yunyan 87 as test material,four treatments were set up by a randomized block experiment,including CK(conventional production operation),TK1(conventional production operation with spraying 2 g/kg sugar alcohol chelated potassium at the maturity stage),TK2(conventional production operation with basal application of 1 500 kg/hm2 straw ash and 20 mg/kg gibberellin at the topping stage),and TK3(conventional production operation with basal application of 1 500 kg/hm2straw ash,20 mg/kg gibberellin at the topping stage and 2 g/kg sugar alcohol chelated potassium at the maturity stage).The effects of different treatments on the agronomic traits,physiological index of tobacco upper leaves in field,the chemical component leaves and economic traits of cured tobacco,and soil nutrient content were analyzed.[Result]At the maturity stage,compared with CK,TK1,TK2 and TK3 all increased the leaf area of the upper six tobacco leaves,with increments of 0.79%,14.91% and 20.88%,respectively.The upper leaf openness of TK1 reduced compared with CK,while that of TK2 and TK3 increased by 0.73% and 2.35%,respectively.Compared with CK,TK1,TK2 and TK3 significantly increased potassium content of cured tobacco leaves by 6.63%,12.15% and 16.02% (P＜0.05),first-class tobacco ratio increased by 0.70%,17.53% and 54.24%,nicotine content decreased by 10.86%,16.85% and 15.74%,sugar-nicotine ratio increased by 2.97%,21.93% and 25.65%,and potassium-chlorine ratio increased by 19.65%,15.79% and 27.72%,respectively.[Conclusion]Compared with increasing basal potassium amount or the interaction between foliar potassium and gibberellin,the synergistic treatment of basal application of straw ash combined with spraying gibberellin at the topping stage and sugar alcohol chelated potassium at the maturity stage is conducive to increasing the leaf area,leaf openness and potassium content,optimizing sugar-nicotine ratio and potassium-chlorine ratio and reducing nicotine content,and increasing first-class tobacco ratio of upper tobacco leaves significantly,which is the effective method for improving the quality of tobacco leaves.
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