Biochar Based Slow-Release Urea Fertilizer: Production and Assessing the Effects on Growth of Lowland Rice and Nitrogen Dynamics in an Alfisol

Use efficiency of N fertilizers in lowland rice cultivation is very low. Biochar can be used to modify the releasing rates and increase their efficiency. Maximum amount urea that intercalated into biochar (BC) effects based slow-release fertilizer (SRF) on soil solution contents growth (Oryza sativa) were investigated. Two feedstock materials (sawdust tea waste) slow pyrolysed at 500°C produce BC using solutions with seven concentrations (U1=0% <U2<U3<U4<U5<U6<U7=100% w/v). The maximum sawdust waste 28% 22%, respectively. Five treatments: two SRFs 17.25 mg kg–1 (75% recommended N) three levels (0, 75, 100% applied plants (Bg 251) a pot experiment. Application SRF significantly improved greenness when compared 0% control comparable urea-N treatment. apparent recovery (ARN) was (p<0.05) (60-71%) only treatments (38-52%). Nitrate-N not different among while NH4+-N content treatment higher throughout. Based intercalation ARN, we concluded made having potential than improve cultivation.