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Macro or major nutrients. Nitrogen (N), phosphorous (P) and potassium (K) are the nutrients your marijuana plants need in the largest quantity to thrive. These are listed on your nutrient package/bottle as N-P-K as a ratio.More detail on N-P-K fertilizer ratio.onsequently a fertilizer high in nitrogen is suitable for vegetative growth and one higher in phosphorous is suitable for flowering. Luckily all of this work has been done for you by the manufacturers. Ideally you will buy your hydroponic nutrients from a hydroponics shop where you will receive good advice.
1 Nutrients are moved inside a plant to where they are most needed. 2  For example, a plant will try to supply more nutrients to its younger leaves than to its older ones. 3  When nutrients are mobile, symptoms of any deficiency become apparent first on the older leaves. 4  However, not all nutrients are equally mobile.arbon and oxygen are absorbed from the air, while other nutrients are absorbed from the soil. Green plants obtain their carbohydrate supply from the carbon dioxide in the air by the process of photosynthesis. Each of these nutrients is used in a different place for a different essential function.