Over the next two episodes we will break down NPK, the acronym used to classify plant fertilizers. NPK stands for nitrogen, phosphorus and potassium. The letters used to represent each of these 3 nutrients are their symbols on the periodic table of elements. This week we will focus on Nitrogen, and next week we'll talk in depth about Phosphorus and Potassium. So, welcome to our 2-part series on organic fertilizer!