The Factors Influencing the Availability of Cobalt in Soils, Uptake by Herbage and Ruminant Health and Productivity

Soil sciences, Animal sciences, Range management

Paterson, Jessie E

University:University of Glasgow

关键词: Soil sciences, Animal sciences, Range management;   

Others  :  http://theses.gla.ac.uk/76813/1/10970829.pdf

来源: University of Glasgow

【 摘 要 】

1. In a series of laboratory experiments involving a total of eighteen soils, the adsorption and desorption characteristics of Co were examined. When the adsorption data from eight soils were applied to various adsorption models, both the Freundlich and Tempkin equations showed good agreement with the observed adsorption pattern. Further, soil pH was identified as the most important factor governing the amount of Co adsorbed and desorbed. For one soil, Co adsorption from a 14.73 ug Co ml -1 solution was complete at pH >8.0, whereas, only negligible amounts of this Co was desorbable. For the same soil at pH <5.0, however, all the adsorbed Co was desorbed within a two-hour shaking period with a Co free solution. Both soil texture and organic matter content appeared to have a strong influence on Co adsorption and desorption, with the role of reducible manganese becoming more important in determining the amount of Co desorbed from samples left for periods of between 2 to 4 weeks. However, while an attempt was made to define an adsorption/desorption index for predicting the residual value of Co application to pasture only preliminary suggestions are presented here.