1. Micronutrients in Northern Climates

Early work on micronutrients in northern US dates back to the late thirties and early forties and dealt primarily with boron (B) (Cook 1939; Cook a nd Millar 1940; Pierre and Allaway 1941). In Manitoba, it was initiated in the sixties and id entified zinc (Zn), copper (Cu) and manganese (Mn) as potential problem micronutrients. Early work also id entified organic (peat) soils as a primary target for micronutrient deficiencies. Work on mineral soils would produce significant yield responses in the...