Umoh et al
Greener Journal of Soil Science and Plant Nutrition Vol. 4 (3), pp. 022-029, August 2017.
© 2017 Greener Journals
Manuscript Number: 080117099
Evaluation of Potassium Fixation Capacity and Residual Values in Soils of Southeastern Nigeria
Umoh F. O*1, Osodeke V. E.2 and Akata O. R3
1Department of Soil Science, Akwa Ibom State University, Mkpat Enin, Nigeria.
2Department of Soil Science and Meteorology, Michael Opara University of Agriculture, Umudike, Umuahia, Nigeria.
This study was conducted to evaluate Potassium fixing capacities and residual values in three selected surface soils of Southeastern Nigeria. The soils were form from Sandstone (SS), Basement Complex (BC) and Basalt (BA) parent materials and were treated to various concentration levels of K raging from 0 – 200mg/l prepared from KCl and amount of K were measure at time intervals of 1, 7, 30, 90 and 180 days. The physical and chemical properties were also assed. Results revealed that the soil had low fertility. The amount of K recovered at different incubation period increase with increase level of K added. The soils recorded the highest amount of extractable K at 30 days of incubation. Sandstone soil had the highest K fixing capacity while Basement Complex soil had the lowest fixing capacity, the trend is as follows: Sandstone (84%) > Basalt (82%) > Basement Complex (76%). Sandstone soil had the highest residual values of added K while Basaltic soil had the lowest residuals values. The trend is as follows: Sandstone (1.4mgkg-1) > Basement Complex (0.59) > Basalt (0.49). The following fertilizer factor (FF) calculated as basement complex (102mg/l)>basalt (96.5mg/l) > Sandstone (62mg/l) are recommended for the soils. A contact time of 30 days is the best time to optimized the benefit of added K. Lighted liming may be done to increase PH and raise the release of K from the soils.
Keywords: Potassium, Parent Material, Fractional Recovery, Fixation, Residual, Fertilizer Factor
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