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The study determined the chemical properties of formulated rice hull char-based compost (RHCBC) and its effect on selected physicochemical soil properties, yield, and profitability of RHCBC for organic potato production under La Trinidad conditions. RHCBC consisting of 50% rice hull char, 25% wild sunflower leaves, and 25% chicken manure were formulated and field-tested for potato production at application rates of 0, 5, 10, and 15 tons ha-1. Results revealed that the formulated RHCBC had 6.48 pH, 12.07% organic carbon, 20.76% organic matter, 0.39% total nitrogen, 0.41% total P2O5, 0.24% total K2O, and 1.05% total N-P2O5-K2O. Soil bulk density (Db), soil pH, organic matter (OM), and exchangeable potassium were not significantly affected by RHCBC application. However, the initial Db of 1.12 decreased to 0.91 to 0.97 g cm-3, and the soil pH increased compared with the control. The application of 15 tons ha-1 RHCBC had the highest OM relative to the control and higher than the initial OM content of the soil before planting. The exchangeable K of soils applied with different RHCBC rates increased from the initial 170 ppm to 227 ppm to 247 ppm. RHCBC application significantly decreased the available phosphorus (P) content of the soil. High amounts of manganese (42.51 ppm), copper (7.31 ppm), and zinc (4.94 ppm) were obtained from the application of 15 tons ha-1 RHCBC. Potato plants applied with 10 tons ha-1 RHCBC had the least non-marketable yield, highest marketable yield, most profitable, and significantly the highest return on investment percentage. Subsequent crops may be recommended considering the high amounts of micronutrients in the soil after harvest.
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