Effects of replacing chemical phosphate fertilizer with lanthanum modified straw after phosphorus adsorption on soil phosphorus forms
The directional modified materials can enhance the ability of phosphorus adsorption and effectively remove phosphorus pollution from water,but the back-end utilization of adsorption materials is seldom studied and reported.In this study,lanthanum modified straw was used to adsorb phosphorus from livestock and poultry tail water,and the material after adsorbing was used as phosphorus fertilizer in wheat pot experiment.Dynamic sampling was used to determine the content of different forms of phosphorus,and the effect on phosphorus forms in the soil was analyzed.The results showed that the phosphorus adsorption efficien-cy of lanthanum modified straw was 98.59%,and the opti-mal input was 1.4 g/L.In the early stage of wheat growth,lanthanum phosphate modified straw continued to absorb active phosphorus in the soil,promoted the conversion of active phosphorus into calcium-adsorbed phosphorus,and prevented the loss of soil phosphorus.With the growth of wheat,the content of calcium-adsorbed phosphorus decreased gradually,and the calcium-adsorbed phosphorus was converted into ac-tive phosphorus to continuously supply nutrients,which indicated that the modified straw with lanthanum phosphate had the properties of slow-release phosphate fertilizer.This study provides a new idea for the utilization of phosphorus-added materi-als,which is helpful to alleviate agricultural non-point source pollution.
NETL
NSTL
万方数据
