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Influence of Copper or Cadmium on Soil Potassium Availability Properties
Author(s) -
Yang Jae E.,
Skogley Earl O.
Publication year - 1989
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/sssaj1989.03615995005300040005x
Subject(s) - chemistry , cadmium , potassium , copper , cation exchange capacity , saturation (graph theory) , soil water , environmental chemistry , soil science , geology , mathematics , organic chemistry , combinatorics
The objective of this research was to determine the nature and extent of increased soil levels of Cu or Cd on K availability properties. Bozeman silty clay (Typic Argiborolls) samples were equilibrated at soil water potentials of −33 or −100 KPa, at temperatures of 5 or 20 °C for 3 or 14 d after additions of three levels of K and three levels of Cu or Cd. Soil solution was extracted by an immiscible liquid displacement technique. The activity of Ca, Mg, and K in soil solutions were increased by Cu or Cd additions ( a Ca > a Mg > a K). The ratio of K to Ca + Mg (K intensity) was decreased by Cu or Cd additions when no K was applied, but increased at high levels of K addition. Soil temperature and water potential interacted with Cu or Cd additions to alter cation activities. Soil K buffer capacity was decreased by Cu or Cd additions. Increasing addition of K increased the proportion of K in both exchange and solution phases, at the expense of both Ca and Mg. Increasing additions of Cu or Cd decreased the fractional saturation of K and Mg, but increased that of Ca in the solution phase, with the reverse influence being exhibited on the exchange phase. Results indicate that Cu had a stronger influence than Cd (at equal rates of addition) on soil properties which regulate K availability.