Rice Husk Compost Production and Use in Mitigating Ammonia Volatilization from Urea

Using value-added products such as compost in farming systems could enable optimization of nitrogen (N) fertilizers whose world-wide demand is on the increase. The objectives this study were to: (i) produce through co-composting rice husk (RH) with chicken dung slurry (CDS), feed, and molasses, (ii) determine effects optimum rate urea RH minimizing ammonia (NH3) volatilization, (iii) total N, exchangeable ammonium (NH4+), available nitrate (NO3?) retained soil following co-application compost. Compost was produced for 60 days by mixing RH, CDS, molasses at a ratio 20:1:1:1. color dark brown had significant amounts major nutrients N (1.15%), phosphorus (3101 mg kg?1), potassium (2038 calcium (863 magnesium (276 organic matter (OM) (60.67%), carbon (35.17%), humic acids (5.87%). C/N 30. electrical conductivity pH 2.79 µS cm?1 6.55, respectively, they not phytotoxic because paddy seeds successfully germinated all extractants. high cation exchange capacity (CEC) (100.67 cmolc kg?1) end composting one determinant factors that controlled NH3 loss from urea. effectiveness urea-N determined using close-dynamic air flow system. significantly minimized volatilization affinity NH4+. An attestation reaction negative charges due to CEC OM temporarily protected NH4+ being transformed into gas. Further evidence higher treatments than alone. High quality can be reduce lost For rate, g 2.9 per trough recommended mitigate instead existing practice (7.3 alone trough).