Fig. 3From: Application of biochar-coated urea controlled loss of fertilizer nitrogen and increased nitrogen use efficiencyCumulative loss of nitrogen and production of NH4+-N, and NO3−-N in different fertilized soils due to leaching during experiment for 65 days. a NH4+–N, b NO3−-N, c total N. CK, no fertilizer; U1,urea at 100% N rate; U2, urea at 80% N rate; U1 + B, biochar combined with urea at 100% N rate; U2 + B, biochar combined with urea at 80% N rate; BCU1, biochar-coated urea at 100% N rate; BCU2, biochar-coated urea at 80% N rate; BCU1 + B, biochar combined with biochar-coated urea at 100% N rate. Error bars represent ± sd (n = 3)Back to article page