Oxygen, carbon, hydrogen, nitrogen, potassium, phosphorus, calcium, magnesium, sulfur, iron, manganese, zinc, copper, molybdenum, boron, and chlorine have all been detected on Martian soil or in Martian meteorites. Depending on the exact location, fertilizers may need to be added to the soil.[28] Lunar and Mars explorations have provided information about the mineral composition of the soils on the Moon and Mars. All essential minerals for the growth of plants appear to be present in sufficient quantities in both soils probably with the exception of reactive nitrogen.