Mixing Sulphate of ammonia, Iron sulphate and Seaweed for lawn feed.

Have been watching various YT channels about lawn care with composts, sand and feeds for spring.

Some mention using a mix of sulphate of ammonia + iron sulphate + seaweed to feed the lawn now in spring.

But none mention the ratio's of the mix with water and used in a sprayer to cover the lawn.

Anyone know, looked on google nothing mentions the mix.

 

Am all in favour of diy solutions but in this case, unless you are looking at massive lawned areas, surely its going to be more economic to buy a ready made product rather than separate tubs to mix your own.
Not only will you need the mix ratio you will need the application rate otherwise you could burn the grass.

The formula you mention is just a feed and moss control, no weed control like the Evergreen lawn products or similar.

This supplier has a range of ready made lawn products or the components if you must.
Lawn & Turf - Elixir Garden Supplies

 

If you have the chemicals already to hand and know the appropriate rate to apply them, then do so by combining them in a known volume of water. Stir until fully dissolved.
For example if it says 50gm/sq mtr of Fe3So4 plus 25gm Nh3So4/sqmtr plus 20ml Seaweed extract to 10 litres of water.
If you use warm water, soluability will improve but allow to cool below 20deg C before applying to 1 sq metre of lawn using a coarse rose. Beware insoluable crystals . These substances are potentially harmful and should not be atomised/sprayed by non qualified personnel.