Understanding the role of micronutrient foliar sprays is crucial for optimizing crop health and yield. While Clemson University identifies seven essential micronutrients—boron, zinc, manganese, iron, copper, molybdenum, and chlorine—Ohio State University adds an eighth, nickel, to the list. But not all of these are equally vital for every crop or situation. Timing and nutrient availability are just as important as the micronutrients themselves. By referencing tools like Mulder’s Chart, growers can navigate the complex interactions between nutrients and make informed decisions about their micronutrient foliar spray applications. This strategic approach can help prevent deficiencies and enhance crop performance.