Paper Details

PJB-2026-1514

Biochemical, physiological and yield response of canola (Brassica napus L.) with exogenous application of potassium and reduced seed rate under irrigation regimes

Qurat-Ul-Ain, Haseeb-Ur-Rehman, Momna Hayat, Adeela Altaf, Hina Ashraf, Muhammad Nadeem Shah, Syeda Refat Sultana, Muhammad Shaheryar, Malik Muhammad Umair, Abdul Rehman, Ahmed E. Al-Sabri and Nawal M. Al-Malahi
Abstract

---

Crop productivity is affected by agronomic practices such as Seed rate, fertilizer and irrigation application. A field trial with different agronomic practices was laid out to improve canola productivity and alleviate drought stress with potassium. The experiment included three factors, Factor A: irrigation regimes i.e. I₀ = Conventional (control), I₁ = Vegetative + bud formation + flowering, I₂ = Vegetative + bud formation + grain development, I₃ = Vegetative + flowering + grain development, I₄ = Bud formation + flowering + grain development), Factor B: exogenous application of potassium (K₁= recommended and K₂= split application of 1/3 soil + 1/3 fertigation + 1/3 foliar), and Factor C: seed rates (S₁= recommended (2 kg per acre) and S₂= reduced (1.5 kg per acre). Results showed that a dramatic response of irrigation regimes was noticed under the potassium application and seed rate. Maximum antioxidant activity of SOD, POD, and CAT was measured in the I₀ treatment (conventional irrigation) with the exogenous application of potassium (K₂) and reduced seed rate (S₂).  Exogenous application of potassium significantly improved the grain yield (2.5%) and biological yield (1.85%) when compared with the recommended treatment (K₁). The same trend was also noticed for reduced seed rate. Grain yield and biological yield (3.38% and 2.61%) increased significantly with reduced seed rate when compared with the recommended seed rate, respectively. It is concluded that by improving agronomic practices like with the exogenous application of potassium with reduced seed rate under I₃ treatment (vegetative + flowering + grain development stage)

To Cite this article: Ain, Q.U., H.U. Rehman, M. Hayat, A. Altaf, H. Ashraf, M.N. Shah, S.R. Sultana, M. Shaheryar, M.M. Umair, A. Rehman, A.E. Al-Sabri and N.M. Al-Malahi. 2026. Biochemical, physiological and yield response of canola (Brassica napus L.) with exogenous application of potassium and reduced seed rate under irrigation regimes. Pak. J. Bot., 58(4): DOI: http://dx.doi.org/10.30848/PJB2026-4(8)
Download PDF