[目的]山梨醇螯合钾的生物利用度高，探究不同喷施浓度对芹菜生长、养分吸收及钾的利用效率的影响，可为高品质芹菜生产提供科学依据与技术参考。[方法]温室大棚条件下，以实验室自主合成的山梨醇螯合钾为供试钾肥，普通实心芹菜为供试作物，在常规施肥基础上设置6个喷施浓度处理(以钾离子计，单位g L-1):CK(0，清水对照)、T1(10)、T2(15)、T3(20)、T4(25)、T5(30)。分析各处理对芹菜收获期产量、生长指标、品质指标、各器官钾素含量与积累及土壤有效钾含量的影响。[结果]不同喷施浓度显著影响芹菜产量、品质及植株-土壤钾的含量。①喷施10 g L-1山梨醇螯合钾可促进芹菜光合作用，表现为SPAD值、株高、叶柄粗及产量的提高;②喷施山梨醇螯合钾可显著降低芹菜可食部位硝酸盐含量，当喷施浓度为10～20 g L-1时显著提升芹菜可溶性蛋白、可溶性固形物含量，其中10 gL-1、15 gL-1与20gL-1喷施浓度处理可溶性固形物含量分别提高26。50％、36。60％与24。40％;③当喷施浓度为25～30 g L-1时显著增加收获期芹菜各器官钾素含量与钾素积累及土壤有效钾含量，以25 g L-1处理效果最明显;(4)经济效益相关性分析表明，芹菜产量、净利润与钾肥利用率、芹菜叶与根钾积累量、叶硝酸盐含量成正比，与土壤有效钾含量呈负相关关系;经济效益分析显示，当喷施浓度为10～15gL-1时效益更好。[结论]芹菜生长旺盛时期追施山梨醇螯合钾，推荐喷施浓度为10～15gL-1，可有效提高芹菜产量、品质及促进钾的吸收利用。
Effects of Foliar Sprays of Different Concentrations of Sorbitol-Chelated Potassium on Celery Growth and Soil Available Potassium in Greenhouse
[Objective]The bioavailability of potassium(K)sorbitol chelate is high.Investigating the effects of different foliar K application concentrations on celery growth,nutrient absorption,and K utilization efficiency could provide scientific basis and technical references for high-quality celery production.[Method]Under greenhouse conditions,K sorbitol chelate,synthesized independently in the laboratory,was used as the K fertilizer for the experiment,and regular celery was the test crop.On the basis of conventional fertilization,six foliar application concentrations were set up(in terms of potassium ions,unit g L-1):0(CK,water control),T1(10),T2(15),T3(20),T4(25),and T5(30).The effects of each treatment on yield at harvest,growth indicators,quality indicators,K content and accumulation in various organs,and soil available P content were analyzed.[Result]Different foliar application concentrations significantly affect celery yield,quality,and the K content in plant-soil systems.Specifically,compared to control treatment.① Foliar application of 10 g L-1 K sorbitol chelate could promote photosynthesis in celery,as evidenced by increased SPAD values,plant height,petiole thickness,and yield.(2)The application of K sorbitol chelate could significantly reduce the nitrate content in the edible parts of celery.When the application concentration is 10-20 g L-1,the soluble protein and soluble solid contents in celery are significantly increased.The soluble solid content increased by 26.50％,36.60％and 24.40％at application concentrations of 10 g L-1,15 g L-1,and 20 g L-1,respectively.③ When the application concentration is 25-30 g L-1,the K content and accumulation in various organs of celery at harvest,as well as the soil available K content,were significantly increased,with the most pronounced effect at 25 g L-1.④ Correlation analysis of economic benefits indicated that celery yield and net profit were positively correlated with K fertilizer utilization efficiency,K accumulation in celery leaves and roots,and leaf nitrate content,but negatively correlated with soil available K content.Economic benefit analysis showed that the benefits were better when the application concentration is 10-15 g L-1.[Conclusion]In conclusion,during the vigorous growth period of celery,the recommended foliar application concentration of K sorbitol chelate is 10-15 g L-1.This concentration effectively enhances celery yield,quality,and K absorption and utilization.
Sorbitol-Chelated PotassiumCelerySoilYield and QualityNutrient Absorption and Utilization
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