Effect of soil amendments on yield components, yield and seed oil percentage of canola (Brassica napus L.)

In order to investigate the effect of soil amendments on yield components, yield and oil percentage of rapeseed (Brassica napus L.), a field experiment was conducted as a randomized complete block design with three replications at the farmer's field located in Amol during 2021. The experimental treatments include the application of soil amendments at eight levels of control or non use of amendments, biochar, silicon nanoparticles, zinc nanoparticles, biochar + silicon nanoparticles, biochar + zinc nanoparticles, silicon nanoparticles + zinc nanoparticles, and the application of biochar + silicon nanoparticles + zinc nanoparticles. The results indicated that the application of all soil amendments improved the yield components, yield and oil content of rapeseed compared with the control treatment or non-use of amendments. In general, the combined application of amendments had better impacts on the studied traits than the individual application of each amendment. Also, among the individual treatments, the application of zinc oxide nanoparticles had the greatest effect in improving yield components and seed yield. The highest plant height (144.33 cm), number of silique per plant (240) and seed yield (3263.7 kg.ha-1) were obtained when all three amendments were used simultaneously. No statistically significant difference was observed between individual and combined treatments of amendments in terms of seed oil content. According to the results of the present study, the simultaneous use of soil amendments can have an effective role in improving the quantitative and qualitative characteristics of rapeseed.