Effect of Chinese Milk Vetch on zinc availability and transformation in purple tidal mud soil under waterlogged incubation conditions
A 90-day indoor incubation experiment was conducted to investigate the response of zinc(Zn)availability and form transformation in purple tidal mud soil of calcareous paddy soil to different amounts of Chinese Milk Vetch added.The results showed that the conversion of mineral residual Zn(Min-Zn)and manganese oxide bound Zn(OxMn-Zn),which were difficult to be absorbed and utilized by plants,as well as potentially effective carbonate boundZn(Carb-Zn),to loosely bound organic Zn(Wbo-Zn)and exchangeable Zn(Ex-Zn)that were easily absorbed and utilized by plants,were promoted.Thereby improving the bioavailability of Zn in purple tidal mud soil.The average conversion ratio of Zn of purple tidal mud soil was the lowest in T1 treatment and the highest in T2 treatment throughout the entire study period.By the end of the experiment,the Zn transfer factor of purple tidal mud soil was increased and the Zn allocation index of purple tidal mud soil was decreased with the addition of Chinese Milk Vetch,which indicating that the Zn of purple tidal mud soil had transformed into an effective component.There were differences in the effectiveness and morphological transformation of Zn in purple tidal mud soil with different amounts of Chinese Milk Vetch added.The optimal addition amount of Chinese Milk Vetch was 22500 kg/hm2.The research results could provide scientific basis for improving the effectiveness of Zn in purple tidal mud soil by planting Chinese Milk Vetch as green manure.
万方数据
维普
