a)Paddy soils.
-Mineral and organic soils managed for rice cultivation.
-Plowing and land leveling.
-Flooded with 5 - 15 cm water.
-Alternate flooding and draining during growing season.
-Soils drained after rice harvest and kept fallow for 4-6 months.
-Development of hard plow pan.
b)Marsh soils.
-Accumulation of plant residues.
-Permanently reduced Bg or Cg horizon.
-Freshwater marsh.
-Saltwater marsh.
c)Salt water marsh soils.
-Neutral pH.
-Presence of FeS2.
-Drained soils have pH < 3.5.
d)Fresh water marsh soils.
-Upland marshes (ombrotrophic).
–Rainfed, hydrodynamically isolated, some ground water exchange.
–pH 3 to 4.5
-Lowland marshes (rheotrophic).
–Receive water and nutrient inputs from adjacent areas.
–pH 5 to 6.
jim items answered the question on February 8, 2019 at 06:08
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