POTASSIUM RELEASE CHARACTERISTICS OF RICE GROWING SOILS IN KURNOOL DISTRICT
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Authors
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J. SWAMANNA, P. KAVITHA, M. SREENIVASACHARI AND M. SRINIVASA REDDY
Department of Soil Science and Agricultural Chemistry, Agricultural College, Acharya NG Ranga Agricultural University, Mahanandi- 518 502
Abstract
An investigation was carried out during the year 2014 to study the potassium releasing characteristics of thirty
rice growing soils in Kurnool district. The samples were analysed for different properties and forms of potassium .The
soils under study were moderately coarse to fine in texture. The order of dominance of different forms of potassium
was fixed K > non exchangeable K > available K > exchangeable K > water soluble K. The study revealed that the
black soils released higher amounts of mean cumulative K (864 mg kg-1) and step K (773 mg kg-1) than red soils.
Whereas, mean constant K release was high in red soils than black soils. Lower amounts of cumulative K was
observed in all soils except in Midthuru soil in the present investigation. Strong positive correlation existed between
step K and cumulative K with clay content in soil showed that clay is the major K supplying source in these soils.
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