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quantities, and micro-nutrients (elements that are required by the plant in smaller amounts). a micronutrient, though required in small doses, is not less vital for plant growth. macro-nutrients micro-nutrients iron (fe), boron (b), copper (cu), chlorine (cl), manganese (mn), molybdenum (mo), zinc (zn) primary
seen in yellowing old leaves. this is because mobile nutrients travel from old leaves to suffuse new growth, whereas immobile nutrients cannot be transferred between new and old growth, so deficiency symptoms will show up in the new growth. nutrients that are mobile in plants include the basic n-p-k primary...
https://www.smart-fertilizer.com/articles/nutrient-uptake/