Soil Characteristics and Behavior of Potassium under Various Moisture Regimes

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Soil characteristics and behavior of potassium in four soils under different incubation time and moisture regimes were studied in the laboratory. Structural K which was the principal source of K in the soils accounted for 91 to 99% of the total K, while exchangeable K (0.26-0.57%) and non-exchangeable K (1.20-8.33%) accounted for a small percentage of the total K. The exchangeable K^+/Mg^<2+> ratio of the soils ranged from 0.06 to 0.14. The amounts of exchangeable K in the soils increased gradually with the lapse of time and the increment was most pronounced in the Belabo and Domar soils followed by the Baliadangi soil. The difference in the moisture regimes slightly but not consistently affected the exchangeable and non-exchangeable K status in the soils. Only the Domar soil was found to release non-exchangeable K but the net fixation was also maximum (0.70 cmol (+) kg^<-1>) in this soil. The maximum net fixation of K was 0.10 cmol (+) kg^<-1> in the Belabo, 0.37 in the Farabari and 0.60 in the Baliadangi soils, throughout the period of incubation. Illite in the soils can be considered to act as a release mineral and vermiculite as a fixation mineral. The amounts of non-exchangeable K varied considerably with the extractant used. The fixation of K in the soils was found to fluctuate with the lapse of time, regardless of soil moisture regimes. These trends were more pronounced when the sulfuric acid system was used, while the nitric acid system was found to be slightly more stable compared with the sulfuric acid system.
社団法人日本土壌肥料学会の論文

Soil Characteristics and Behavior of Potassium under Various Moisture Regimes

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