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Pot and field trials were conducted to investigate Cd uptake and phytoremediation efficiency of two  Brassica napus  cultivars (QY-1 and SYH) with applied water-soluble chitosan (WSC, Pot: 0, 2% and 4%; Field: 0 and 10 g·m −2 ) grown in Cd-contaminated soils. The results from the pot and field trials generally showed that WSC treatments significantly increased Cd concentrations in shoot and root tissues by 33.77–159.71% (except for SYH/JY) and 7.42–168.71% of two  B. napus  cultivars compared with the control ( p  &lt; 0.05). The uptake of Cd by shoots of SYH was obviously higher than by shoots of QY-1 treated with WSC under pot and field conditions, which was 1.54–2.22 times than that of QY-1 ( p  &lt; 0.05). The results indicated that 2% WSC treatment significantly increased the water-soluble and acid extractable Cd in rhizosphere soils of both  B. napus  cultivars. Furthermore, Cd concentrations in the oils of two  B. napus  cultivars with applied WSC (10 g·m −2 ) grown under field conditions were not significantly different from commercial rapeseed oils. Rapeseed oil of  B. napus  is not only an edible oil with high nutritional value, but it can also be converted into biomass diesel that can be used as a substitute for petroleum diesel.

Water-soluble chitosan and phytoremediation efficiency of two Brassica napus L. cultivars in cadmium-contaminated farmland soils