Sulfur is an essential macronutrient needed by plants to perform a variety of functions. All plants need sulfur to produce chlorophyll, making leaves green so plants can accumulate biomass through photosynthesis. Often referred to as the fourth major nutrient. sulfur plays a vital role in plant development and should be considered when evaluating nutrient management practices. Although sulfur is categorized as a secondary macronutrient behind nitrogen, potassium, and phosphorus, this does not imply it is less important.