1- Agronomic Research Institute, (AARI), Faisalabad, Punjab Pakistan , sabaiqbal87@gmail.com
2- Agronomic Research Institute, (AARI), Faisalabad, Punjab Pakistan
2- Agronomic Research Institute, (AARI), Faisalabad, Punjab Pakistan
Abstract: (275 Views)
Potassium (K) mitigates the effect of high temperature on canola, especially during its later growth stages when sowing of canola is delayed. To explore the effect of K on high temperature tolerance and canola production a field experiment (2019 – 2021) was conducted. The experiment had two sowing dates (October 15 and November 1) and four K treatments, i.e. control, soil application (50 kg K ha-1), soil application + 0.25% K foliar spray at pre- and post-flowering stages and soil application + 0.50% K foliar spray at pre and post-flowering stages. Application of 50 kg K ha-1 as soil application along with 0.50% K-foliar sprays resulted in higher production of biochemicals (superoxide dismutase, peroxidase, catalase, and total soluble sugars) besides net photosynthetic rate and stomatal conductance along with less malondialdehyde production and relative cell injury in crops sown on November 1st than untreated plants. Moreover, it also enhanced chlorophyll florescence and chlorophyll (a and b) contents of late- sown crops. Plants sown on November 1st and received 50 kg K ha-1 as soil application along with 0.50% K foliar spray also gave a higher yield components, yield and economic returns than control. Therefore, it is suggested to supply 50 kg K ha-1 at sowing and a foliar spray of 0.50% K at the pre- and post-flowering stages to canola crops sown late in the season to achieve optimal and economical yield levels.
Keywords: high temperature, reactive oxygen species, antioxidant activities, foliar spray, lipid per oxidation.
Article Type: Original Research |
Subject:
Crop Physiology
Received: 2023/10/2 | Accepted: 2024/01/1
Received: 2023/10/2 | Accepted: 2024/01/1
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