PJB-2022-243
ALLEVIATING SOIL ACIDITY, Al3+ AND/OR Fe2+ TOXICITY FOR SUSTAINABLE RICE PRODUCTION IN ACID SULFATE SOILS
Fahana Jamaluddin Alia
Abstract
Abstract Acid sulfate soil can be used for rice cultivation with proper management practices. A field trial was conducted in acid sulfate soil to determine the effect of applying ground magnesium limestone (GML) with or without bio-fertilizer on the changes of soil chemical properties and its effect on growth and yield of rice. Rice seedlings of MR219 variety were transplanted into each experimental plot and treatment imposed were as; GML 0, 2 and 4 t ha-1 with or without bio-fertilizer (0.25 t ha-1). Initial soil pH was 3.78, while the exchangeable Al and extractable Fe were 2.82 cmolc/kg and 211.01 mg/kg, respectively. Scanning electron micrograph (SEM) showed excess Al3+ and Fe2+ causes root injury. Application of GML 2 t ha-1 in combination with bio-fertilizer (0.25 t ha-1) improved soil pH from 3.78 to 5.25 and reduced Al3+ and Fe2+ concentrations in the soil and simultaneously improved grain yield (3.99 t ha-1). The lowest grain yield 2.12 t ha-1 was obtained in the control plot. In conclusion, application of biofertilizer (0.25 t ha-1) with GML (2 t ha-1) improved soil chemical properties and rice yield and it can be a sound technology for sustainable rice production in acid sulfate soil.
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