1) Nitrates
Contain nitrogen for making amino acids and proteins.
It is needed for cell growth a plant can't get enough it will be stunted.
It will have yellow leaves.
2) Phosphates
Contain phosphorus for making DNA and cell membranes.
Needed for respiration and growth. Plants without enough phosphate will have poor root growth and have purple older leaves.
3) Potassium
It helps enzymes needed for photosynthesis and respiration. If there isn't enough potassium in the soil, plants have poor flower and fruit growth and discoloured leaves
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