Three soil water regimes, continuous submergence, alternate submergence and continuous saturation were selected to study their influence on nutrient transformations after application of lime in an acid (Tropofluvent) and acid sulphate (Sulfaquept) of Andamans. Soil pH increase was less when the soil water content decreased from submergence to saturated condition. A gradual increase in soil pH was observed up to 30 days under all soil water and lime treatments. Application of lime at 1/2 LR reduced Al3+ content of the acid soil below the toxicity level in submerged and alternate submerged and saturated conditions after 30 days of incubation. In acid sulphate soil, extractable Al3+ content was neutralized throughout the period of incubation when lime was applied at full dose under submerged condition. But saturated soil water even with full rate of lime application failed to lower extractable Al to levels below the toxic limit. When the soils were either kept alternatively waterlogged and saturated or were continuously under saturation, the amounts of Fe remained low in comparison with continuously waterlogged condition in both the soils. Lime significantly increased the available P status of both acid and acid sulphate soils, the increase being less at alternate submergence and saturation or continuous saturation moisture regimes than when the soils were kept under continuous submergence. Liming of both the soils resulted in a gradual increase in the extractable Ca2+ up to 60 days.
Liming, submergence, soil moisture regimes, acid and acid sulphate soils
