Effectiveness on soil and foliar applied micronutrient mixes
Use of micronutrient mixes is often promoted as a means of alleviating micronutrient deficiencies or simply providing a “balanced” nutrition to crops. We carried out nineteen experiment with wheat, twenty-nine with barley and five with canola from 1989 to 1994 to ascertain whether “targeted” or “non-targeted” use of micronutrient mixes provide an effective means of alleviating micronutrient deficiencies or simply increase yield due to a “balanced” nutrition. Two commercially available products were used, one for soil and one for foliar applications. The product for soil application was banded, broadcast and incorporated or seed-placed in five experiments with wheat and barley. There were no statistically (P<0.05) yield increases with any of the uses of this product. Foliar applications of the other product, on the other hand, resulted in a number of significant increases, namely, in four of nineteen experiments with wheat, in eight of twenty-seven experiments with barley and in two of five experiments with canola. None of these responses could provide an economic return or be predicted based on either soil tests or targeted yields.
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