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The aim of this study was to investigate the efficacy of chicken manure and biochar on soil chemical properties and the growth of green oak lettuce. The experiment was conducted in a factorial in CRD with 6 replications. Twelve treatments included the combination between 4 rates of chicken manure (0, 500, 1,000 and 2,000 kg/rai) and 3 rates of biochar (0, 500 and 1,000 kg/rai) applications. The results showed that the increase of chicken manure provided better soil chemical properties, especially the electrical conductivity and organic matters, while the increase of biochar could improve soil pH. In addition, increasing the rates of both chicken manure and biochar significantly enhanced the growth, yield and concentration of nitrogen and phosphorus of plant (p ≤ 0.05). Moreover, the application of 2,000 kg/rai rates of chicken manure and 1,000 kg/rai rates of biochar showed the highest yield that was 1,723.72 kg/rai, 35 times higher than that of the control (no chicken manure and biochar) (48.31 kg/rai). Therefore, results of this study reveal that the utilization of chicken manure and biochar can improve soil chemical properties and enhance the yield of green oak lettuce under acid soil condition.
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