Question

what will happen if excess amount of fertilizers is added to do grass lawn

Answer 1

when excess of fertiliser is added to a grass lawn the water from grass undergoes a process of exosmosis due to a higher solute concentration region outside and therefore the plant eventually dies .
hope this helps u

Answer 2

When you use excessive amount of fertilizer then it float an grass lawn , if rain happening then all fertilizer go to nearby pond then due to excessive amount of fertilizer all pond oxygen absorb from organism then all pond oxygen got finished and algae got set up on the top of pond . It is serious disease for fish and organism to survive