1. Nitrates
Contain Nitrogen for making Amino- Acids which is needed for Cell growth, If a plant cant get enough nitrates it will be stunted and will have yellow older leaves.
2. Phosphates
Contain Phosporus for making DNA and cell membranes and they are needed for respiration and growth. Plants without enough phosphate have poor root growth and purple older leaves.
3.Potassium
To help the enzymes needed for photosynthesis and respiration. If there is not enough potassium in the soil, plants have poor flower and fruit growth and discoloured leaves.
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