sentences:  His current research focuses largely on the phytotoxicity of trace metals in soil solutions, giving particular consideration to aluminium and other trace metals such as lead, copper, zinc, and nickel.Professor Menzies was one of the first Soil Scientists to examine the impact of biochar on soil solution composition and soil chemical fertility.Since this time, his research has focused on the development of novel biochar technologies, with a focus on improving plant growth and food production in Africa.