Impact of Skipping Irrigation and Foliar Spraying with‏ ‏Antitranspiration‏ ‏on Sunflower ‎Plants (Helianthus annuus L.)‎

Document Type : Note

Authors

1 Department of Crops, Faculty of Agriculture, Al-Azhar University, Assiut

2 Dept. of Agronomy, Fac. of Agric., Al-Azhar Univ., Assiut, Egypt

Abstract

field experiment was conducted to evaluate the effect of three levels of irrigation (normal and skip irrigation during vegetative growth and during flowering stage) and foliar spraying with different concentrations of antitranspiration agents; salicylic acid (0, 150, and 300 mg/L) and ascorbic acid (0, 200, and 400 mg/L) on the growth, yield and it’s components of sunflower under Assiut Governorate conditions. The experiment was conducted at the research farm of the Faculty of Agriculture, Al-Azhar University, Assiut Branch, during the summer seasons of 2023 and 2024. A randomized complete block design (RCBD) using strip plot arrangement with three replications. Irrigation was applied in vertical plots while horizontal plots were sprayed with different concentrations of anti-transpiration. The results showed that normal irrigation was superior significantly to skip irrigation during vegetative and flowering stage in growth traits such as plant height (cm), stem diameter (cm), plant dry weight (g) and leaf area index, as well as in yield traits and its components such as head diameter (cm) at the first seasons only , 100-seeds weight (g), seeds yield/head (g), biological yield (ton/fad.), seeds yield (ton/fad.) and oil yield (kg/fad.) while the percentage of oil in seeds increased when skip irrigation was applied during flower development. Regarding spraying with anti-transpiration, spraying 150 mg/L of salicylic acid gave the highest values for all traits.

Keywords

Main Subjects

Egyptian Journal of Agronomy
Volume 47, Issue 4
December 2025
Pages 1397-1410

Files

History

  • Receive Date: 22 June 2025
  • Revise Date: 23 October 2025
  • Accept Date: 29 October 2025

Share

How to cite

Statistics