施钾方式对棉花叶片抗氧化酶活性、产量及钾肥利用效率的影响

doi:10.3724/SP.J.1006.2012.00487

Abstract

Abstract: With application of modern cotton (Gossyium hirsutum L.) varieties including Bt (Bacillus thuringiensis) transgenic cotton, premature senescence caused by potassium (K) deficiency has become an important problem in cotton production in the Yellow River Valley of China. Field trialswere conducted in 2009 and 2010using Lumianyan 28. Four treatments consisting of no potassium (CK), basal application of potassium sulfate (T1), split application (1/2 basal dressing and 1/2 top-dressing at blossoming and boll forming stage)of potassium sulfate (T2), basal application of controlled-released compound fertilizers (T3) were designed. The same amount of potassium was applied with 150 kg K₂O ha^{–1 in each fertilizer treatment. The results indicated that application of potassium significantly increased chlorophyll and soluble protein contents, superoxide dismutase (SOD) and catalase (CAT) activities (at the leaf ages of 30, 40, and 60 days), seed cotton yield and lint yield, as compared with CK. Moreover, application of potassium produced significantly lower} malondialdehyde (MDA) content and peoxidase (POD) activity (at the leaf ages of 30 and 45 days), as compared with CK. Split application (1/2 basal dressing and 1/2 top-dressing at blossoming and boll forming stage)of potassium sulfate significantly increased soluble protein content (at the leaf ages of 30, 40, and 60 days), SOD (at the leaf ages of 15, 30, and 45 days)and CAT(at the leaf ages of 15 and 30 days) activities, seed cotton yield, lint yield and potassium use efficiency, and produced significantly lower MDA content (at the leaf ages of 30, 45, and 60 days) and POD activity (at the leaf age of 30 days), as compared with basal application of potassium sulfate and controlled-released compound fertilizers, respectively. As far as high yield and high efficiency concerned in the experiment, the most appropriate potassium fertilization for recommendation is treatment T2 with split application (1/2 basal dressing and 1/2 top-dressing at blossoming and boll forming stage)of potassium sulfate.

Key words: Cotton (Gossypium hirsutum L.), Potassium application method, Antioxidant enzyme activity, Yield, Potassium use efficiency

LI Zong-Tai, CHEN Er-Ying, ZHANG Mei-Ling, ZHAO Qiang-Long, XU Xiao-Long, JI Hong, SONG Xian-Liang, SUN Xue-Zhen. Effect of Potassium Application Methods on Antioxidant Enzyme Activities, Yield and Potassium Use Efficiency of Cotton[J].Acta Agron Sin, 2012, 38(03): 487-494.

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Effect of Potassium Application Methods on Antioxidant Enzyme Activities, Yield and Potassium Use Efficiency of Cotton

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