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The Release of Exchangeable and Nonexchangeable Potassium From Several Mississippi and Alabama Soils Upon Continuous Cropping
Author(s) -
Gholston L. E.,
Hoover C. Dale
Publication year - 1949
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj1949.036159950013000c0019x
Subject(s) - soil water , citation , agriculture , agricultural experiment station , cropping , library science , environmental science , history , archaeology , soil science , computer science
' I ^HE supply of potassium, as well as nitrogen and •*• phosphorus, 'is deficient in a large number of red and yellow podsolic soils of the southeast. Generally the supply of soil potassium is considered as existing in two forms: exchangeable and nonexchangeable. For this study exchangeable potassium was regarded as that portion which was extracted by neutral normal ammonium acetate. Nonexchangeable potassium was that portion which was not extracted from the soil by neutral normal ammonium acetate. The nonexchangeable potassium makes up the bulk of the soil potassium, and it is contained largely in prima'ry and secondary minerals such as feldspars, muscovite, biotite, and hydrous mica. The release of potassium, with emphasis on the nonexchangeable form as measured by a continuous cropping technique,' has been investigated by a number of workers (1, 3,' 6, 8, 9, 14), but no studies of this nature have been conducted on Mississippi soils. Therefore, the primary purpose of this investigation was to study the importance of exchangeable and nonexchangeable potassium in eight Mississippi and three Alabama soils. In order to determine the relative amounts of exchangeable and nonexchangeable potassium released by these soils, a continuous cropping technique under greenhouse conditions was employed.