Boron (B) deficiencies in Wisconsin are more widespread than deficiencies of any other micronutrient. Soils may contain 0.5–2.0 parts per
million (ppm) of available boron, but this represents only a small part of the total since only 0.5–2.5% of the total boron in the soil is available to plants. Plants take up less than 0.5 lb/a boron, yet lack of this nutrient can reduce yields severely.
Lack of boron often limits production of forage legumes (alfalfa, clover, trefoil) and of some vegetable crops in the state. Find out how to manage this mineral in your soil with this helpful fact sheet.