Effects of foliar application of water-soluble chitosan and silicon fertilizers on cadmium uptake of two win-ter rapeseed cultivars
To explore the effects of silicon fertilizer(Si)and water-soluble chitosan(WSC)on the cadmium(Cd)content of rapeseed,a field experiment was set up in a cropland with a slight-moderate level of Cd pollution,around a typical operating smelter in Jiyuan City,Henan Province.We examined the effects of Si and WSC foliar fertilizations on biomass,Cd content,and bioconcentration coefficient of two large-scale planting cultivars of winter rapeseed(Brassica napus),Qinyou No.1(QY-1)and Sanyuehuang(SYH).The results showed that,compared with the control,spraying Si or WSC could reduce the Cd uptake by the grains and husks of the two tested rape-seeds.After foliar spraying of Si and WSC,the Cd content in QY-1 grains decreased by 8.80％-44.01％and 15.01％-37.77％,respectively;the Cd content in SYH grains decreased by 20.94％-32.42％and 14.33％-28.65％,respectively.The Cd contents of grains and husks of rapeseed reached the lowest level after spraying Si twice,and second lowest was the treatment with spraying WSC once.Compared with SYH,QY-1 had a higher bio-mass and lower Cd enrichment capacity after foliar fertilizations.Therefore,QY-1 is more suitable for the safe pro-duction in slightly to moderately Cd-contaminated soil.In conclusion,the low-Cd-accumulating rapeseed cultivar combined with agronomic measures of spraying foliar fertilizer can preliminarily realize the safe utilization of slightly or moderately Cd-contaminated soils surrounding the smelter.
万方数据
维普
