Effect of Seaweed extract (Basfoliar Kelp sl) and Sulphate (K-leaf) on yield and some yield components of winter rapeseed (Brassica Napus L.) var. Natalie

A field experiment was conducted in 2016 at Damavand county in Tehran province to study the effects of foliar application seaweed extract (Basfoliar Kelp sl) as first factor and foliar sulfur trioxide (K-leaf) as second factor on grain yield, oil content, biological yield, number of sub shrubs, number of pods on sub shrubs, dry weight, seed 1000 weight and harvest index of winter rapeseed (Brassica napus L.) var. Natalie. This factorial experiment was implemented in a randomized complete block design with three replications and 12 treatments. The foliar sprays was applied thrice (3-5 leaf, stem elongation and an thesis stages) at different concentrations involving 0, 1, 2 and 3 l.ha of seaweed extracts (namely Ecklonia maxima) and 0, 1.5 and 2.5 l/ha sulfur trioxide (So3). Foliar applications of seaweed extract, except harvest index (HI), significantly enhanced the yield, physiologic and morphologic parameters. Also So3 spraying significantly enhanced number of sub shrubs, number of pods on sub shrubs, oil content and grain and biological yields. Interactions between two factors with the application of 3 l/ha seaweed extract as well as 2.5 l.ha sulfur trioxide, affected significantly with making 48.96% grain oil compared to the control (45.95%) on oil content increase (6%) and also 167.6 pods compared to the control (64) on number of subshrubs pods growth (62%).