Excessive use of which of the following fertilizers may be responsible for the presence of a toxic substance in groundwater?
1) Nitrogen
2) Phosphate only
3) Potassium only
4) Phosphate and potassium
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Excessive use of which of the following fertilizers may be responsible for the presence of a toxic substance in groundwater?
1) Nitrogen
2) Phosphate only
3) Potassium only
4) Phosphate and potassium
1) Nitrogen