Effects of oyster shell powder applying at different growth stages on cad-mium accumulation in wheat grains
Reducing the accumulation of cadmium(Cd)in edible parts of crops is an effective way to reduce the risk of human Cd exposure.Oyster shell powder has attracted much attention because it can improve soil acidification,pro-mote crop yield and reduce the accumulation of Cd in crops.In order to clarify the effect of oyster shell powder application at different growth stages on Cd accumulation in wheat grains,three treatments were set up in this study:no oyster shell powder application(CK),oyster shell powder application at jointing stage and oyster shell powder application at heading stage.The effects of oyster shell powder applica-tion at different growth stages on Cd accumulation and dis-tribution in wheat organs were analyzed.The results showed that the application of oyster shell powder at joint-ing stage and heading stage could significantly increase the 1 000-grain weight and shoot dry weight of wheat,and the Cd content in wheat grains decreased by 24.9% and 37.7%,respectively.The application of oyster shell powder in the two periods had little effect on the total Cd uptake in the grains,and the distribution ratio of Cd in the grains increased slightly.The application of oyster shell powder at heading stage could more effectively promote the accumulation of Cd in the inter-nodes under the ear.In conclusion,the heading stage was the key period for Cd accumulation in wheat grains.The applica-tion of oyster shell powder during this period could increase the retention of Cd in the internodes below the spike,reduce the stress of Cd on the growth of wheat plants,increase the yield of wheat grains,and lead to the decrease of Cd content in wheat grains.
万方数据
维普
