Impacts of CDs@LDHs composite on the external nitrogen transformation in soil
The application of nitrogen fertilizer is indispensable in agricultural production.However,the practical utilization efficiency of nitrogen fertilizer remains low,with excess nitrogen being volatilized into the atmosphere or converted into nitrate and leaching into groundwater.To alleviate this problem,the implementation of nitrogen stabilizer has emerged as an effective approach.The present study involves the synthesis of LDHs via co-precipitation method,preparation of CDs using microwave technique,and subsequent formation of CDs@LDHs composite.X-ray diffraction and transmission electron microscopy are employed to characterize the composition and morphology of CDs@LDHs composite,while adsorption and desorption performance towards ammonium nitrogen are evaluated.The findings demonstrate that CDs@LDHs composite exhibits excellent adsorption efficacy under ambient temperature and neutral conditions,along with a gradual desorption behavior that effectively mitigates the impact of high-intensity external nitrogen fertilizers.Further investigations reveal significant nitrogen fixation effects of CDs@LDHs composite on various external nitrogen fertilizers such as ammonium chloride,urea and organic fertilizer derived from chicken manure.Notably,when applied to organic fertilizer,it can reduce nitrification rate and ammonia volatilization by over 50％and approximately 20％.
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