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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.
Compost contains Nitrogen, Phosphorous, Potassium, and a great abundance of other trace elements that will benefit your plants. It is clear that Nitrogen, Phosphorous, and Potassium are not necessarily the most important elements you need for your plants to grow well.rganic composts and composted manure are excellent sources of all nutrients plants need to grow, including NPK. Professional gardeners who use chemicals and organic gardeners agree that using compost is one of the best things you can do to feed your plants are feed them the nutrients they need.