eli5 : If plants can make their food with water and carbon dioxide using photosynthesis why do they need manure and fertilisers ?

Question

eli5 : If plants can make their food with water and carbon dioxide using photosynthesis why do they need manure and fertilisers ?

In: Biology

Answer 1

water and carbon dioxide are just three atoms: Carbon, Oxygen, and Hydrogen. A plant is more than those three and those come from the soil.