How irrigation interruption affects growth and yield of canola genotypes under various plant density?

In order to investigate the effect of drought stress on canola vegetative growth and yield components of rapeseed genotypes, an experiment was conducted as a factorial split plot arranged in a randomized complete block design with three replications during growing season of ۲۰۲۱-۲۰۲۲. The experimental treatments included three levels of irrigation as main plot: (۱. Control: no interruption of irrigation, ۲. interruption of irrigation at the beginning of flowering (phenology code ۶۰) until the formation of ۵۰% of the panicles (phenology code ۷۵) and ۳. interruption of irrigation at the stage of panicle formation until harvest. (phenological code ۹۹)) and three levels of plant density (۸۰, ۱۱۰ and ۱۴۰ plants per square meter) and canola genotypes (Hayola ۴۸۱۵ and Aram) were arranged in subplots. The results showed that the effects of plant treatment and genotype on stem diameter were significant while the interaction effect of irrigation treatment and genotype was significant on the number of branches. The highest grain yield was obtained from genotype Hayola ۴۸۱۵ in the flowering stages up to ۵۰% of flowering and yielding and density of ۱۱۰ plants per square meter and yielding until harvest at the density of ۸۰ plants per square meter, the highest grain yield (respectively with the values of ۱۲۱۶.۷۹, ۱۲۰۸.۲۱) kg per hectare) was obtained.

Keywords:

Canola , Plant density , Drought , Seed yield