Fertilizer application is a research area within agricultural science that focuses on the optimal use and application of fertilizers to optimize plant growth and crop yield. This research area explores the different types of fertilizers, their nutrient content, and the most effective application methods to maximize nutrient uptake by plants. Researchers in this field study factors such as soil nutrient levels, plant nutrient requirements, and environmental considerations to develop recommendations for farmers to improve fertilizer efficiency and reduce environmental impacts. Overall, fertilizer application research plays a crucial role in sustainable agriculture practices and increasing food production to meet the growing global demand.