Abstract
Abstract The reestablishment of fertility in soils of forest nurseries and plantations is now seriously handicapped by the dearth of knowledge pertinent to trace elements : boron, manganese, zinc, copper, and molybdenum. The scarcity of information in this important segment of tree nutrition often lowers the quantitative and qualitative production of forest crops. In recent years, several reports indicated incidence of foliar chlorosis of pine seedlings raised in come of Wisconsin nurseries on soils well supplied with major nutrient elements and free from parasitic organisms. To preclude the possibility of a loss or a deterioration of nursery stock, it was decided to conduct a systematic survey of the supply of trace elements in soils of State forest nurseries of Wisconsin. This task was greatly facilitated by recent improvements in the determination of available fractions of these elements by either chemical or microbiological methods.
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