[Objective]To elucidate the impact of potassium(K)fertilizer application on the growth and physiol-ogy characteristic of Festuca arundinacea,and to establish the appropriate K fertilizer application rate and K nutrition diagnosis index.[Method]A pot experiment was conducted to investigate the responses of shoot growth,physiology and K absorption characteristics in Festuca arundinacea under various K application rates(0,18,36,54 g/m2).[Result]With an increase in K fertilizer application,the plant height and dry matter accumulation in the shoot at each growth stage exhibited an initial increase followed by a decrease,reaching their maximum value at a K application rate of 36 g/m2.The plant height increment and dry matter accumulation rate were notably higher at 50～137 days and 0～50 d after emergence.The application of K fertilizer 36 g/m2 proved beneficial for enhancing K absorption in the plant shoot,elevating photosynthetic pigment content,antioxidant enzyme(POD)activity,soluble protein content in the leaves,while reducing malondialdehyde(MDA)content.However,it is noteworthy that an excessive amount of K fertilizer increased the risk of K loss in the cultivation system of Festuca arundinacea.The optimal range for K fertil-izer application in promoting Festuca arundinacea growth was found to be 7.0～49.9 g/m2,with the critical K concen-tration required for 80%of the maximum shoot dry matter accumulation identified as 10.8 g/kg.[Conclusion]The application of K fertilizer exerted significant effects on the growth and physiological characteristics of Festuca arundi-nacea.The potassium application rate of 7.0 g/m2 and the K concentration of 10.8 g/kg in plant shoot could serve as valuable references for K fertilizer recommendation and K nutrition diagnosis in the conservation and management of Festuca arundinacea,respectively.
关键词
钾肥/苇状羊茅/生长生理特性/钾吸收/钾肥适宜用量/钾营养诊断
Key words
potassium fertilizer/Festuca arundinacea/growth and physiological characteristics/potassium ab-sorption/suitable application rate of potassium fertilizer/potassium nutrition diagnosis
维普
万方数据