STUDY ON THE GROWTH OF WATER SPINACH WHEN ADDING RICE HUSK BIOCHAR WAS ADSORBED AMMONIUM

Abstract

The aim of this study was to consider the growth of water spinach when adding rice husk biochar was adsorbed ammonium (NH₄⁺) of biogas wastewater. The experiment was completely randomized with 6 treatments and 4 replicates: (1) Applying 100% of rice husk biochar was not absorbed ammonium, (2) Applying 100% inorganic fertilizer (As recommended by the Ministry of Agriculture and Rural Development), (3) Apply 50% of rice husk biochar was absorbed ammonium + 50% inorganic fertilizer, (4) Apply 75% of rice husk biochar was absorbed ammonium + 25% inorganic fertilizer, (5) Apply 100% of rice husk biochar was absorbed ammonium, (6) Apply 125% of rice husk biochar was absorbed ammonium. The study results were showed that the treatments of adding ammonium-adsorbed rice husk biochar was growth and yield both increased compared to the addition of non-ammonium-adsorbed biochar. The best amount of biochar and manure for the growth of water spinach was 50% of rice husk biochar was adsorbed ammonium and 50% inorganic fertilizer. In short, it is possible to make use of rice husk biochar was adsorbed ammonium of biogas wastewater to replace a part of inorganic chemical fertilizers, which is very useful for agriculture and contributes to reducing environmental pollution.