Thus, it is possible to encounter deficiencies of iron, manganese, copper or zinc as a result of excess application of other micronutrients. These deficiencies can occur even when a normally sufficient concentration of the deficient micronutrient exists in the substrate. Common micronutrient antagonisms. Many combinations of micronutrients are used in greenhouses. Each can be safe and effective when used in the role for which it was formulated.
Excesses usually occur when multiple combinations of micronutrients are applied.
This occasionally happens because some of the micronutrient sources are not obvious to the grower. Most commercially formulated greenhouse fertilizers contain micronutrients. Fertilizers prepared by the greenhouse firm as an alternative to commercial products are often formulated with micronutrients. Generally, plants respond well to the combination of micronutrients in substrates and fertilizers. The differences in micronutrient content between the standard and the soilless substrate formulations of one given fertilizer analysis are given in Table 2.