PROPERTIES OF SODIC SOILS IMPROVED WHEN AMENDED WITH GYPSUM AND MUNICIPAL WASTE IN AN INCUBATION EXPERIMENT
Keywords:Gypsum, incubation, municipal waste, sodic soils
An incubation experiment was conducted under controlled conditions for 90 days to study the collaborative effect of gypsum and municipal solid waste compost (MSWC) on two soils varying in electrical conductivity (ECe) and sodium adsorption ratio (SAR). Treatments, (T0) control, (T1) 100% soil gypsum requirement (SGR), (T2) 75% SGR + 1.2 g MSWC kg-1 soil, (T3) 50% SGR + 2.5g MSWC kg-1 soil, (T4) 25% SGR + 3.8 g MSWC kg-1 soil and (T5) 5.0 g MSWC kg-1 soil, were mixed in soil-I (ECe: 25.7 dS m-1; SAR 48.2; sandy clay loam) and soil-II (ECe: 22.4 dS m-1; SAR 78.2; sandy loam) at the start of incubation. After 90 days of incubation, treatments significantly (P? 0.05) influenced ECe, SAR, bulk density (BD), tensile strength (TS) of aggregates and percent water stable aggregates (%WSA). There was 51 and 56%; 63 and 38%; 26 and 28% decrease in ECe, SAR, and bulk density over control treatment with T3 soil-I and soil-II, respectively. Similarly, organic matter content, porosity, aggregate stability and tensile strength were increased as compared with control. To measure CO2 release, soil samples with all the above mentioned treatments were separately incubated in enclosed jars for 60 day. Data relating to cumulative CO2 release indicated that C mineralization rate was higher in MSWC amended samples. Results of this experiment revealed that combined effect of organic and inorganic amendments improves the physical and chemical condition of salt-affected soil.
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