dc.contributor.author | Barber, RG | |
dc.date.accessioned | 2015-07-09T08:28:13Z | |
dc.date.available | 2015-07-09T08:28:13Z | |
dc.date.issued | 1979 | |
dc.identifier.citation | Journal of Soil Science 1979 Vol. 30 No. 4 pp. 785-792 | en_US |
dc.identifier.uri | http://www.cabdirect.org/abstracts/19801954475.html?resultNumber=6&q=au%3A%22Barber%2C+R.+G.%22 | |
dc.identifier.uri | http://hdl.handle.net/11295/86911 | |
dc.description.abstract | Potassium fixation was measured for 13 Kenyan soils with a range of applied potassium (0 to 1000 mg kg-1). The fixed potassium was measured, and hence is defined in this study, by the difference between the amount of applied K and the increase in the extractable K after equilibrium, using a single 'equilibrium' extraction procedure with 0.25 M CaCl2 as the extractant. At application rates of 50 and 1000 mg kg-1 the fixed potassium varied from -52% to 64% and 7% to 39% respectively. A correlation was found between the K fixation and % clay content at the 1000 mg kg-1 application rate. Estimates of the % fixation by the clay fractions gave 53 to 80% for montmorillonites, 48 to 66% for amorphous clays and 19 to 32% for kaolinites. It is suggested that the amorphous clays may fix potassium by a 'sieve' mechanism. | en_US |
dc.language.iso | en | en_US |
dc.publisher | University of Nairobi | en_US |
dc.title | Potassium fixation in some Kenyan soils. | en_US |
dc.type | Article | en_US |
dc.type.material | en | en_US |