Fertilisers are used to provide three of the elements needed for plant growth.
Which two compounds would give a fertiliser containing all three of these elements?
1 )
$Ca{\left( {N{O_3}} \right)_2}$ and ${\left( {N{H_4}} \right)_2}S{O_4}$
2 )
$Ca{\left( {N{O_3}} \right)_2}$ and ${\left( {N{H_4}} \right)_3}P{O_4}$
3 )
$KN{O_3}$ and ${\left( {N{H_4}} \right)_2}S{O_4}$
$KN{O_3}$ and ${\left( {N{H_4}} \right)_3}P{O_4}$
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