This study was conducted to develop an eco-friendly slow-release fertilizer by utilizing activated biochar through black carbonization of rice hull biochar and activated palm biochar. To manufacturing these fertilizers, the raw materials were ground into powder form, mixed with the binder, granulated, and then screened and dried. The best six types were selected by considering the hardness and coupling degree with activated biochar and binder. The nutrient contents of the granular fertilizer contained within the activated biochar were 30-0-13 (N-P2O5-K2O, %). Results did not show a significant effect on cabbage's leaf color, length, and width among the different treatments except for the control. However, it showed that the highest yield among the treatments was 3.5 kg plant -1 in the treatment of 5% of rice hull activated biochar. In this treatment, the yield was increased by 20% relative to that of the control. Therefore, it was decided that the optimum mixing ratio was 5% of activated rice hull biochar.
This study was conducted to evaluate how granular slow release fertilizer containing activated rice hull biochar can effect on growth of cabbage and save its fertilizer usage amount. The cabbages (chuwol) were transplanted with randomized block design for 3 replications on September 3 rd , 2019, and the treatments consisted of non-fertilizer, control, commercial slow-release fertilizer, conventional practice and activated rice hull biochar mixed with fertilizer (ARHBMF) in 4 different basal fertilizer (21-17-17) levels; 100%, 80%, 60% and 40% before planting. Each treatment received the same amount of additional fertilizer. Regarding this result, it can be reduced at 40% of basal fertilizer application, and the total fertilizer application rate was decreased with 52.8% compared to the control. The highest yield in the 60% ARHBMF was 3.5 kg plant -1 based on one time of basal application and the yield index increased at 20% compared to the control. The application rate of 60% ARHBMF was reduced at 66.7% relative to the application rate of commercial slow-release fertilizer. For the benefit analysis, the cost in the 60% ARHBMF was decreased at 61.8% and 60.8% compared to the control and commercial slow-release fertilization plots, respectively.
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