The effects of soil manganese status on the bioavailability of soil cobalt for pasture uptake in New Zealand soils

Authors

  • Zheng Li
  • R.G. Mclaren
  • A.K. Metherell

DOI:

https://doi.org/10.33584/jnzg.1999.61.2341

Abstract

The effects of soil properties on the availability of cobalt (Co) for pasture uptake have been studied using a wide range of New Zealand soils. There is a strong positive correlation between total or EDTA-extractable Co and manganese (Mn) concentration. However glasshouse studies have shown that Co availability is inversely related to the Mn concentration. Across a wide range of soil groups, EDTA-extractable Co is a poor predictor of cobalt availability. CaCl2-extractable Co was found to decrease with soil pH and was too pH sensitive to be a good predictor of Co availability. It is concluded that soil Mn plays a crucial role in soil Co status and has significant effects on plant Co uptake because of its involvement in the soil redox system and the scavenging properties of soil Mn oxides. Co deficiency is more likely to occur and Co fertiliser is less effective on soils with high Mn, especially under dry conditions. Keywords: lime, pasture cobalt, soil cobalt, soil manganese, soil moisture, trace elements

Downloads

Published

1999-01-01

Issue

Section

Articles

Most read articles by the same author(s)