Ammoniacal and Nitrate Nitrogen Release Pattern from Biochar and Biochar Blended Urea Fertilizers in Sandy Soil

Biochar, an organic product of thermal decomposition biomass in oxygen limited environment can be used as a nutrient carrier to delay the release nutrients into soil, reduce leaching, and improve utilization efficiency fertilizers. Nutritional enhancement biochar through fertilizer blending could low cost but high solution compared non-blended However, rate from blended different soils is ambiguous. Hence 12 month incubation study was conducted sandy soil (ultisol) Thiruvananthapuram district Kerala elucidate ammoniacal nitrate nitrogen pattern produced paddy husk biochar, bentonite (1:1) each with urea ratios (1:0.5, 1:1, 1:2) including absolute control. The individual effects biochar-bentonite were also studied. Paddy by process slow pyrolysis biochar- fertilizers adsorbent process. To evaluate influence clay on it fertilizer. highest total content among recorded biochar: 1:2 (33.04%) followed biochar-bentonite: ratio (31.13%). revealed that maximum soil+ at 30 days (115.73 mg kg-1) sharp decline, maintaining value till end incubation, whereas sustained gradually increased reach 180th day (117.6 for 1:1 ratio. Nitrate same trend observed 150th (151.2 kg-1). more than throughout period all treatments. Among fertilizers, both comparatively less –bentonite Thus, biochar/ prolonged duration release.