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The soil in Northeastern (NE) Thailand are generally sandy with low fertility, soil facing with nutrient leaching from chemical fertilizers added due to low nutrient holding capacity and the high risk of percolation. It was hypothesized that Eucalyptus biochar may increase soil fertility and plant growth. Thus, the objective of this study was to evaluate the effect isolate or combined application of eucalyptus biochar and NPK fertilizers on growth, yield, nutrient uptake and some soil chemical properties of upland rice grown in poor fertility sandy soil. Pot experiment was conducted under greenhouse condition. The experiment using a completely randomized designs (CRD) with 3 replications. There are 4 treatments i.e. (1) control (no biochar and NPK fertilizer), (2) biochar (0.055 g/ pot, (3) NPK fertilizer (15-15-15) at 1.38 g/ pot and (4) biochar (0.055 g/ pot) + NPK fertilizer (1.38 g/ pot). Urea fertilizer (46-0-0) at 0.277 g/ pot was applied at panicle initiation (PI) stage for all pots. Biochar combination with NPK treatment provided greater upland rice grain yield, harvest index (HI), total P and total K uptake. However, the effect of these combination was not found in root performance, but presented in the sole biochar treatment. In addition, the biochar combination with NPK treatment ameliorate soil organic matter and exchangeable Ca in upper soil depth. Thus, biochar combination with NPK treatment may a promising practice to improve soil fertility and productivity in upland rice.
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