Deficiencies of micronutrients, such as zinc, occur sporadically through the field, associated with the above suspect soil conditions. This uneven or delayed ripening may cause harvest delays or reductions in sample quality. Zinc levels in the soil can be measured using a DPTA extractant. Plant uptake of zinc is greatest from broadcast and incorporated applications. However, starter-banded applications are popular among growers.
Foliar applications can correct in-season deficiencies.
Confirm nutrient deficiencies with soil tests, tissue tests or strip applications of foliar sprays. Beans are very sensitive to boron toxicity, so use caution when applying boron to crops such as sugar beets or alfalfa which may proceed bean crops or avoid following these crops with beans. Manitoba's Soil Fertility Guide Top Plant Tissue Testing Consider using plant tissue testing for routine crop monitoring or diagnosis of problems. The following table contains guidelines for interpretation of tissue analyzes taken at this time. However, if a nutrient deficiency is suspected, sample as soon as the problem appears.