Effect of Phosphorus Enriched Biochar Fertilizer Prepared From Pig-manure on the Soil-radish System

In order to promote the rational application of phosphorus(P)-enriched biochar fertilizer in purple soil of southwest China, pot experiments were conducted to investigate the effects of P-enriched biochar fertilizer prepared from pig manure on the physicochemical properties of purple soil, as well as its influence on the yield and quality of cherry radish. The results show that after adding P-enriched biochar fertilizer prepared from pig manure, the soil pH value and organic matter, total N and total K contents in soil were significantly increased. The opplication of P-enriched biochar fertilizer also increased the contents of available P by 21.72%-43.47% and 0.22%-28.42% during the rosette stage and fleshy root swelling stage of cherry radish, respectively. The above-ground and root biomass of cherry radish treated with this P-enriched biochar fertilizer were lifted by 17.20%-44.17% and 20.63%-83.31%, respectively. The contents of P, total sugar and vitamin C in cherry radish were significantly increased, and the content of P in cherry radish had a significant correlation with the content of available P in soil (P < 0.01), while the Pb and Cd contents of cherry radish decreased respectively by 6.12%-44.49% and 4.19%-13.31%. In conclusion, application of P-enriched biochar fertilizer prepared from pig manure can significantly improve the physicochemical properties of purple soil, and increase the yield and quality of cherry radish.