Abstract
High-temperature stress is a major limiting factor to decrease seed yield and oil content. Using micronutrients such as zinc (Zn), manganese (Mn), and boron (B) are considered agricultural management practices for improving the quantity and quality of oil under high temperature at the seed filling stage. The experiment was carried out as a split-plot based on a randomized complete block design with three replications over 2 years. Main plots consisted of three sowing date levels (Nov. 5, Nov. 25 and Dec. 15), and subplots included ten levels of foliar application of micro-nutrients (2, 4, 6 g l−1 Zn; 2, 4, 6 g l−1 Mn; 2, 4, 6 g l−1 B, and the foliar application of distilled water as control treatment). Foliar applications were at rosette (BBCH scale code-30) and the opening of the first flower (BBCH scale code-61). Any delay in planting resulted in higher mean air temperature during the seed-filling period by 4 °C and 0.9 °C in the first and second year, respectively. The reduction of seed yield due to the delay in sowing date on Nov. 25 and Dec. 15 were respectively 7% and 35%. The highest seed yield (4411 kg ha −1) belonged to foliar application of B (4 g l−1) at the first sowing date (Nov. 5) and the lowest ones (1624 kg ha −1) were associated with the last sowing date and using distilled water. High temperature during the seed filling period led to more palmitic, stearic, linolenic, and oleic acids, but generated less linoleic acid. Foliar application of Zn (4 g l−1), Mn (2 g l−1) and B (4 g l−1) led to an increase in the seed yield by 12%, 22% and 29%, respectively. According to the results of this experiment, more than 340 kg ha−1 reduction in the seed yield was observed as the temperature increased by one degree from 28 °C. Based on the results of the experiment, the application of micro-nutrients (Zn, Mn, and B) elevated the seed yield and oil content on all sowing dates.
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This research was supported by Agricultural Research, Education and Extension Organization (AREEO) as well as Safiabad Agricultural and Natural Resources Research and Education Center.
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Seyed Ahmad Kalantar Ahmadi: conceptualization, methodology, field practices, writing- original draft preparation; Jahanfar Daneshian: software, writing-review and editing.
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Kalantarahmadi, S., Daneshian, J. Improving of Canola (Brassica napus L.) Yield and Oil Quality by Foliar Application of Micro-nutrients Under High-Temperature Stress. J Soil Sci Plant Nutr 23, 351–367 (2023). https://doi.org/10.1007/s42729-022-01016-2
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DOI: https://doi.org/10.1007/s42729-022-01016-2