Do a search for liquid fertiliser in the search box there's loads of threads on here discussing the pros and cons etc.I don't need any liquid fertiliser or nitrogen but someone else does
Is it right that it's bought in concentrated form then diluted?
Is it the best thing since sliced bread?
What application per acre is used?
The amount the leaf can actually take in is minimal,better than nothing but would need doing so often it’s not practical on broad acre farming. With adequate NPKS in the soil too that would encourage roof growth therefore making take up of residual N easier for the crop. Like it or not we will need the N in the soil from a some source.With the price of bagged fert is foliar applied NPK plus trace worth a go.
Never be the same but could be tonic at correct time possibly?