Nitrogen (N) is the most common chemical element in the atmosphere, is abundant in water and soil, and is vital for all living things. Nitrogen plays a critical role particularly for plant growth and the production of chlorophyll, which is essential for the process of photosynthesis. Nitrogen is a primary macronutrient for cannabis health, along with Phosphorus (P) and Potassium (K). These macronutrients are typically represented as a ratio of NPK, with a 3:1:1 a good ratio throughout the growth of most cannabis strains, nitrogen percentages should be reduced, however, as your plant begins to flower and as phosphorus and potassium levels are increased. Plants and an early flowering stage call for a ratio of about 1:3:2, whereas late flowering should be adjusted closer to 0:3:3. Without enough nitrogen, your marijuana plants will encounter severe growth and development problems hindering productivity and maximum yield.