AGTU

AcronymDefinition
AGTUAir Generation and Treatment Unit (brake systems)
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Exchangeable K ([K.sub.ex]) was determined by extraction of 500 mg soil, 2000 mg sand, 500 mg silt, or 200 mg clay with 20 mL of unbuffered 0.01 M silver thiourea [(AgTU).sup.+] for 16 h with end-over-end shaking followed by centrifugation.
StepK = Total K extracted in the 6 extractions - [(AgTU).sup.+]K - CRK
Exchangeable Ca, Mg, K, Na, and aluminium (Al) were extracted by shaking samples of soil with 0.01 M silver thiourea (AgTU) at a soil to solution ratio of 1:20 for 2 h (Method 15Fl).
The exchangeable K was determined by extraction of samples with 20 mL of unbuffered 0.01 U silver thiourea [(AgTU).sup.+] for 16 h with end-over-end shaking followed by centrifugation (Rayment and Higginson 1992).
Exchangeable K was determined by extraction of 0.5 g soil with 20 mL of unbuffered 0.01 M silver thiourea [(AgTU).sup.+] for 16 h with end-over-end shaking followed by centrifugation (Rayment and Higginson 1992) and values were adjusted for the water-soluble K form.
Cation exchange capacity (CEC) was measured using the (AgTU)+ method and exchangeable aluminium (Al) by the 1 M KCl method, both described in Rayment and Higginson (1992).
The 0.01 M silver-thiourea [(AgTU).sup.+] method as documented by Raymond and Higginson (1992) was used to determine cation exchange capacity (CEC) and exchangeable sodium percentage (ESP) of all media.
Cation exchange capacity (CEC) was determined by single extraction of air-dry soil with unbuffered 0.01 M silver thiourea (AgTU)[sup.+] for 16 h with end-over-end shaking, followed by centrifugation (Rayment and Higginson 1992).