Hydroponic experiment was carried out to assess the effect of K in reducing the oxidative damage in maize (Pioneer-3335) under salt stress. Seedlings were transplanted to three levels of K (3, 6 and 9 mM) with 100 mM NaCl stress. Plant growth parameters, membrane stability index, K + / Na + ratio and antioxidant enzymes activity were reduced due to salt stress. Addition of K significantly improved the morphological and physiological attributes along with the antioxidant enzymes (SOD, CAT and

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... ) activity. With increasing K levels an improvement in crop growth was observed but the treatment with 9 mM K was found to give the best results. Maximum shoot and root lengths (61.2 and 30.6 cm) were observed at 9 mM applied K level. The similar trend regarding shoot and root fresh weight was observed for maize genotype. Improved membrane stability was observed at 9 mM K level in (Pioneer-3335) (75.6%) under salt stress. Similarly, improved antioxidant enzymes (SOD, CAT and POD) activity was found in maize plants (35.5, 65.6 and 49.6 unit/g fresh weight) as compared to salt stress at 9 mM K level. The antioxidant enzymes activity was improved with the application of potassium under salt stress which ultimately induced oxidative stress tolerance in maize (Pioneer-3335).