NPK fertilisers are applied to promote plant growth. A solid NPK fertiliser is described by these properties: • soluble in water • forms an aqueous solution with pH $7$ Which substances are combined to produce a solid NPK fertiliser?
- Aammonium nitrate, potassium sulfate and phosphorus oxide
- Bammonium phosphate and potassium hydroxide
- Cammonium sulfate, calcium nitrate and sodium phosphate
- Dpotassium nitrate and sodium phosphate