A comparison of potential, active and post-active acid sulfate soils in Thailand

Iron‑sulfur geochemistry and acidity retention in hydrologically active macropores of boreal acid sulfate soils: Effects of mitigation suspensions of fine-grained calcite and peat

“…The accumulation of schwertmannite and jarosite on the macropore surfaces of the reference columns in terms of amounts (and to some extent also in terms of concentrations) led to a significant build-up of the S NAS fraction (approximately 8-9 g/kg, Fig. 2b), compared to the interiors whose S NAS concentrations were overall comparable with those reported for bulk acid sulfate soils in the tropical regions (Sukitprapanon et al, 2015;Yuan et al, 2015;Huang et al, 2016). The dissolution and hydrolysis of these iron oxyhydroxysulfates could not only result in a successive decrease in S NAS , but also slow release of acidity and thus inhibit the recovery of soil pH.…”

Effect of Co-Fertilizer Application and Dolomite Amendments on Yield and Grain Quality of Rice Grown on Post-Active Acid Sulfate Soil

“…The results indicated that applying lime material (dolomite) was necessary for plants to grow in the area, as the soil in this area was classified as acid sulfate soil (postactive acid sulfate soil) (Division of Soil Survey and Soil Resource Research, 2019), which had a soil pH above 4 (Table 1). Generally, the central plains have been an important area of acid sulfate soils in Thailand (Sukitprapanon, Suddhiprakarn, Kheoruenromne, Anusontpornperm, & Gilkes, 2016) and most acid sulfate soils are amended with ground limestone, marl, or dolomite that increase soil pH reactions. More recently, Mansingh, Sures, Raj, & Vignesh (2019) studied the application of lime material (dolomite and calcite) on the yield and nutrient uptake of rice in acidic soil.…”

“…This growing area includes the important acid sulfate soil (ASS) area, which is prevalent in Thailand's central region. AAS data in Thailand was reported by Sukitprapanon, Suddhiprakarn, Kheoruenromne, Anusontpornperm, & Gilkes (2016). They indicated that ASS in Thailand occupied approximately 8,800 km 2 in the lower central plains and a small area in the country's southeast coast and peninsular region.…”

“…However, in the upper central region, there were mainly post-active acid sulfate soils (PAASS), especially in Phra Nakhon Si Ayutthaya province. PAASS characteristically has a pH higher than 4 (Fanning, 2012), and is attributed to the development of AAS by agricultural management such as drainage, liming, irrigated agriculture, and periodically flooded paddy fields (Sukitprapanon, Suddhiprakarn, Kheoruenromne, Anusontpornperm, & Gilkes, 2016). However, this level of soil pH can cause some toxic metals to be released, affecting rice growth.…”

Application of Earthworm Manure (EWM) and NPK Fertilizer to Improve the Quality of Acid Sulphate Soil (ASS) as a Sweet Corn (Zea mays L) Cultivation Land in North Sumatra, Indonesia

“…Acid Sulphate Soil is a type of soil that is formed in swampy areas. This soil is affected by the state of water and contains sulfidic material (sulfur clay) which contains a lot of pyrite (FeS 2 ) [4,26]. If the soil is reclaimed, the pyrite compound (FeS 2 ) will be exposed to the air and can be oxidized to form ferric hydroxide (Fe(OH) 3 ), sulfate (SO 4 2-) and hydrogen ions (H + ) so that the soil becomes very acidic with a low pH [3,5].…”