Document Type : Research Paper
Authors
1
PhD Student, Department of Agronomy, Faculty of Crop Sciences, Sari Agricultural Sciences and Natural Resources University, Sari, Iran
2
Associate Professor, Department of Agronomy, Faculty of Crop Sciences, Sari Agricultural Sciences and Natural Resources University, Sari, Iran
3
Associate Professor, Department of Agronomy, Genetics and Agricultural Biotechnology Institute of Tabarestan, Sari Agricultural Sciences and Natural Resources University, Sari, Iran
4
Assistant Professor, Department of Agronomy, Faculty of Crop Sciences, Sari Agricultural Sciences and Natural Resources University, Sari, Iran
5
Assistant Professor, Rice Research Institute of Iran- Mazandaran Branch, Agricultural Research, Extension Organization (AREEO), Amol, Iran
Abstract
In order to evaluate the effect of deficit irrigation and certain types of potassium fertilizers on some physiological characteristics and antioxidant enzymes activity in rice (cv. Tarom Hashemi), two field experiments were conducted in the Amol and Savadkouh stations. Treatments were different irrigation methods at two levels (flooding, flooding after falling water depth under 10 cm of soil surface) and the application of different potassium fertilizers including potassium sulphate, potassium chloride and potassium biofertilizer at nine levels. Based on the results, relative water content (RWC) and soluble leaf proteins significantly decreased under deficit irrigation in both two stations as compared to flooding irrigation treatment. Also, the accumulation of proline and the activity of antioxidant enzymes such as catalase, ascorbate peroxidase (APX) and guaiacol peroxidase in both two stations, and the amount of hydrogen peroxide and malondialdehyde in the Amol station increased under deficit irrigation. Results demonstrated a positive effect of potassium fertilizer application through significant increment in soluble leaf proteins in both two stations. Also, RWC and APX activity were increased in Amol station under limited irrigation condition. The highest amounts of grain yield was obtained from the50% of potassium sulfate (as basal) and 50% of potassium chloride (as top dressing) treatment under deficit irrigation that was around 22.8 and 21.5% higher than the control treatment in both Amol and Savadkouh stations, respectively. Generally, results showed an optimal effectiveness of potassium sulfate and potassium chloride application reducing undesirable effects of water deficit stress on rice grain yield.
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