EFFECT OF FOLIAR APPLICATION OF KAOLIN AND DIFFERENT SOURCES OF POTASSIUM ON YIELD, GROWTH AND PHYSIOLOGICAL CHARACTERISTICS OF GRAPEVINE CV. ASGARI UNDER RAINFED CONDITIONS

Document Type : Full Paper

Authors

1 Department of Horticultural Science, School of Agriculture, Shiraz University, Shiraz, Iran

2 Department of Horticultural Science, School of Agriculture, Shiraz University, Shiraz, ,Iran

3 Department of Horticultural Science. faculty of Agriculture, Guilan university, Rasht, Iran.

Abstract

Global warming and recent droughts are one of the main factors in reducing agricultural products. A research was conducted in order to increase the adaptability of "Asgari" grapevine against drought stress in rainy conditions.In this research, Foliar spraying with kaolin (6%) and potassium sources (1.5% and 3% each of potassium nitrate, potassium sulfate and potassium chloride) was done during two seasons on 30-year-old vines located in Shiraz. Kaolin is a highly durable antiperspirant for vineyards, and it is a realistic and attractive strategy to protect grape clusters from excessive heat and sunburn. The results showed that the application of different sources of potassium caused an increase in pill weight, cluster length, soluble solids, chlorophyll, leaf and fruit potassium content, relative leaf water content, and a decrease in the activity of antioxidant enzymes and leaf temperature compared to the control treatment. On the contrary, kaolin treatment decreased these traits and increased the activity of antioxidant enzymes compared to the control treatment. Potassium sources in both concentrations were able to improve the morphological and physiological characteristics of the plant compared to the control treatment. The result of this improvement was the superior resistance of these vines to drought and heat stress and increased yield compared to the control treatment. The application of kaolin did not have a positive effect, which may be due to the inappropriate concentration used.

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Articles in Press, Accepted Manuscript
Available Online from 09 June 2024
  • Receive Date: 28 May 2023
  • Revise Date: 07 March 2024
  • Accept Date: 10 March 2024