This study sought to measure the yield and quality of rapeseed (Brassica napus L.) and their response to different tillage systems and foliar spraying with humic acid within the conditions of Mosul City. A field experiment proceeded during the winters of 2020–2021 and 2021–2022 in the Al-Rashidia Region, Iraq (longitude 43.15° East and latitude 36.35° North), to study the response of three rapeseed genotypes (G1: Lirakotta, G2: Edita, and G3: Diamant) to three tillage levels. The first was conventional (CT: conventional tillage), which plowed the land with a perpendicular disc plow before field division; the second level was minimal tillage (MT: minimal tillage), leveling the soil and reducing tillage; and the third level was no-tillage (NT: no-till). Additionally, applying foliar spraying with three concentrations of humic acid (0, 5, and 10 mg L-1) emerged at the six-leaf stage. The experiment, carried out using a factorial experiment in a randomized complete block design, had three replicates for each experiment. The following results were notable. The Diamant genotype gave the highest mean for all growth, yield, and quality traits for both growing seasons. Tillage systems significantly affected all categories of growth, yield, and quality traits in two planting seasons (2020–2021 and 2021–2022). Foliar application of humic acid at the concentration of 5 mg L-1 gave a significant increase in all growth, yield, and quality traits for both growing seasons.
Rapeseed (B. napus L.), genotypes, tillage systems, foliar application, humic acid, growth and yield traits
The rapeseed (B. napus L.) genotype Diamant gave the highest mean for all growth, yield, and quality traits for both growing seasons. Tillage systems had a significant effect on all categories for growth, yield, and quality traits in two planting seasons of 2020–2021 and 2021–2022.