Dynamics of Sugar Beet Vinasse in Soil and Its Effect on Physicochemical Properties of Calcareous and Acidic Soil

To determine the effects of vinasse on physicochemical properties of a calcareous and an acidic soil experiment was factorial and had a complete randomized design and three replications. Factorial combinations of five vinasse levels (0, 5, 10, 20 and 40 t/ha) and three exposure times (10, 20 and 30 days) were considered as the treatments of this experiment. The result of experiment showed that the percentage of dispersible clay in both soils increased as the exposure time increased. The effects of vinasse levels were also significant on the percentage of dispersible clay and application of vinasse increased and decreased this parameter respectively in acidic and calcareous soils. The result of analysis of variance of data showed that time of exposure to vinasse was not effective on the pH of the soils. Application of vinasse decreased the pH of the acidic soil significantly but it was not effective on the pH of the calcareous soil. The application rate of vinasse was effective on EC of both soils and the EC increased with increasing the application rate. To compare decomposition rates of vinasse in acidic and calcareous soils, an experiment was performed in this experiment, vinasse was added to samples of both soils at the rate of 5% and the samples were incubated for 2 months the decomposition rates of vinasse were measured by direct method and collecting CO2 in sodium hydroxide. The results showed that 59% and 69% of vinasse carbon decomposed respectively in calcareous and acidic soils during incubation period (60 days). The decomposition rate of vinasse was faster in the beginning of incubation period (first 5 days) and decreased with time. In the first 5 days of incubation period, the decomposition rate of vinasse was higher in the acidic soil than the calcareous soil. But after that and as the time elapsed the decomposition rates of vinasse in both soils became similar. To compare decomposition rates of vinasse in acidic and calcareous soils, an experiment was performed in this experiment, vinasse was added to samples of both soils at the rate of 5% and the samples were incubated for 2 months the decomposition rates of vinasse were measured by direct method and collecting CO2 in sodium hydroxide. The results showed that 59% and 69% of vinasse carbon decomposed respectively in calcareous and acidic soils during incubation period (60 days). The decomposition rate of vinasse was faster in the beginning of incubation period (first 5 days) and decreased with time. In the first 5 days of incubation period, the decomposition rate of vinasse was higher in the acidic soil than the calcareous soil. But after that and as the time elapsed the decomposition rates of vinasse in both soils became similar.