Materials and Methods:
Soil samples of Ap horizons from benchmark soils:
RED soils
LATERITE soils
Kodad (Andhra Pradesh State)
Vijaypura (Karnataka State)
Tyamagondalu (Karnataka State)
Dodabhavi (Tamil Nadu State)
Kumbhave (Maharashtra State)
Nedumangad (Kerala State)
UNTREATED SOILS: determination of the native potassium release by succesive extractions with 0.01 M CaCl
2
PRE-TREATED SOILS: addition of 1,000 ppm K to the soil
Determination of the potassium retention, measuring exchangeable K by extraction with NH
4
OAc
Determination of the potassium release by succesive extractions with 0.01 M CaCl
2
(Majumdar and Datta, 1999)
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