Darrell Smith

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The Nutrient Navigator series focuses on efficient, environmentally sound management of nutrients. The goal is to provide practical knowledge that helps drive yields and profits higher.
Once you confirm the diagnosis, here’s how to handle iron problems
Iron, a vital element for crop production, is like some people—laced with contradictions.
Copper and molybdenum are easy to manage if you know how to identify deficiencies
Problems can be avoided, or easily fixed, once you understand this secondary nutrient.
From photosynthesis to building carbohydrates, manganese packs a punch
Zinc deficiency—which can easily cost 15 bu. to 20 bu. of corn per acre—is not something you can walk into a field and diagnose
Applying too little phosphate fertilizer can draw down your soil “bank account” and reduce yield, especially if the crop is stressed by weather or other factors.
It’s likely not the first nutrient you think about, but boron is critical to many plant functions
Let your soil and rotation tell you where to expect boron deficiencies