Effects of Different Potassium Fertilizers on Carbon and Nitrogen Metabolism and Potassium Absorption of Flue-cured Tobacco under Fertigation Conditions
To address the issue of low potassium content in flue-cured tobacco in the Pingdingshan tobacco-growing area,the effects of different potassium fertilizers on carbon and nitrogen metabolism,as well as potas-sium absorption of flue-cured tobacco('Zhongyan100',a prominent local variety),were investigated.The re-sults showed that fertigation combined with four applications of prepared potassium fertilizer,slow-release potas-sium fertilizer,and biological potassium fertilizer improved photosynthetic capacity and carbon and nitrogen me-tabolism in tobacco plants,thereby promoting their growth and development.The greatest promoting effect was observed with slow-release potassium fertilizer>biological potassium fertilizer>homemade potassium fertiliz-er.Furthermore,the application of different types of potassium fertilizers improved the activity of SOD and other protective enzymes in tobacco plants,enhancing the resistance of flue-cured tobacco.The order of promotional effects observed was biological potassium fertilizer>slow-release potassium fertilizer>homemade potassium fertilizer.Gene expression analysis related to potassium metabolism indicated that the rational use of these three types of potassium fertilizers effectively promoted potassium absorption and transport,reduced potassium efflux,and increased potassium storage in tobacco plants.In the two treatments,combining four applications of prepared potassium fertilizer with fertigation,and using slow-release potassium fertilizer,significantly increased potassi-um content in the middle and upper tobacco leaves.
Flue-cure tobaccoPotassium fertilizersCarbon and nitrogen metabolismPotassium uptakePotassium content
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