Hawraa Tahseen Abd Ulwahid ^*(1) and Lamiaa M.S. Al-Freeh⁽¹⁾  

(1). Fied Crops Dept .College of Agriculture ,University of Basrah, Iraq.

(*corresponding author :Hawraa ulwahid E-mail : hawraathsyn95@gmail.com).

 Received:7/09/2023                 Accepted:12/11/2023

Abstract: 

During the winter agricultural season of 2022–2023, a field experiment was carried out at the Agricultural Research Station of the College of Agriculture – University of Basra, Karma Ali site, to find out how Rapeseed (Pactol-var) responded to topping and various ethephon concentrations, which are represented as follows: T = topping, E0 = 0 ethephon concentration, E1 = 1 ml L^-1 ethephon, and E2 =2 ml L^-1 ethephon, Which was applied during different stages of the crop’s life (elongation, flowering, branching) and has the symbol S1, S2, and S3, respectively,. Three replications of the experiment were carried out using the split-plot method in accordance with the randomized complete block design, with the topping and the ethephon occupying the main plots and the stages of the secondary plots. The following characteristics were studied: Number of branches, leaf area index, crop growth rate, net assimilation rate, seed yield, protein percentage, protein yield, oil percentage, and oil yield. The results showed a significant effect of topping and ethephon on most of the studied traits. The E2 treatment and topping excelled in most of the studied traits if it gave the highest seed yield of 2.703- and 2.694-tons ha-1, respectively. Treatment S1 had the best results for all the studied traits and recorded the best yield of 2,431 tons ha-1. The combination E2 at stage S1 excelled in most of the studied traits and gave the best yield of 3,094 tons ha^-1.

Key words: Brassica napus L. (Canola) ، Ethephon،Topping, growth, oil

Full paper in Arabic: pdf