Soil amendments can affect soil properties such as pH, EC, available phosphorus (P), and ammonium nitrogen (NH4+). The aim of this study was to determine the potential influence of submergence incubation time on some soil properties using soil amendments under controlled laboratory conditions suitable to the characteristics of rice-growing areas in Kien Giang, Vietnam. The experiment included treating soil supplemented with lime (at ratios of 0.0, 0.4, 0.6, and 1.0%) and soil supplemented with lime (0.4%) combined with alkalized biochar (at ratios 0.0, 0.2, 0.4, and 0.8%). The treatments were incubated in the laboratory under submerged conditions, and pH, EC, available phosphorus (P), and ammonium nitrogen (NH4+) parameters were measured at 7, 14, 21, 35, and 60 days. The results showed that soil supplemented with lime improved pH and EC, and maintained high phosphorus release for 21 days, but did not improve NH4+ release. In contrast, soil supplemented with lime (0.4%) combined with alkalized biochar improved pH and EC, maintained high levels of phosphorus and NH4+ content up to 35 days. The results showed that using lime combined with alkalized biochar to improve soil in rice-growing areas has many advantages compared to using lime alone. Therefore, understanding the contribution of soil incubation time with amendments to soil properties is an important prerequisite for developing a strategy to ensure crop productivity.
Key words: EC, phosphorus, NH4+, pH, rice cultivation, incubation time
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