The impact of potassium silicate foliar application on some morphological, physiological and biochemical properties of rape genotypes under late seasonal drought stress

Document Type : Research Paper


1 Ph.D. Candidate in Crop Physiology, Shahrood University of Technology, Iran.

2 Associate Professor of Department of Agronomy, Faculty of Agriculture, Shahrood University of Technology, Iran.

3 Professor of Seed and Plant Improvement Institute (SPII), Agricultural Research, Education and Extension Organization(AREEO), Karaj, Iran.

4 Associate Professor of Department of Agronomy, Faculty of Agriculture, Shahrood University of Technology, Iran


Drought stress is one of the most impactive factors of Severe modification in plant physiology, eventually leading to a reduction in crop productivity. Increasing growth, yield, crop quality, and reducing the side effects of drought stress are some of the important roles that potassium silicate plays in plants. In order to study the effects of late-season drought stress and foliar application of potassium silicate on yield and yield components of spring genotypes of canola, a factorial split-plot experiment was conducted in Karaj, Iran in a randomized complete block configuration with three replications for two years of cultivation (2016-2018). The irrigation was performed at two levels in this study, including routine irrigation (control) and interruption of irrigation from the pod formation stage. Potassium silicate foliar application at two levels comprised of 0 and 4 g liter-1 in factorial status in main plots and five Brassica napus L. genotypes including OG×AL, RGS×SLM, DALGAN, RGS003 and RGS×Okapi in subplots. The authors found that the interaction impact of irrigation, the application of potassium silicate foliar, the genotype of the number of pods per plant, the number of seeds per pod, the yield of seeds, the level of leaf proline, the glucosinolate and the temperature of the canopy were significant. It is proposed that OG×AL genotype be used in regular irrigation and application of potassium silicate and in late-season dry conditions and in the application potassium silicate of RGS×SLM and DALGAN genotypes.


Main Subjects

Volume 35, Issue 3
October 2022
Pages 511-524
  • Receive Date: 30 June 2020
  • Revise Date: 28 December 2020
  • Accept Date: 14 January 2021
  • First Publish Date: 15 May 2021