The majority are provided by the soil. Micronutrient deficiencies in some soils do occur. For example, in soils where pH levels approach 7 and phosphorus levels are high, fertilizer Zn will need to be added. Consult university guidelines for Zn in your state.
For more information on this or other topics related to corn production, contact your state extension corn specialist or your local extension educator/agent.
The following is the link to the corn extension specialists: state extension corn specialist

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