Hi all,
Yes, it is. You can actually use rain water if you don't have easy access to RO or DI water. We have a thread <"
Solufeed 2:1:4 and Solufeed Sodium Free TEC Combination">.
Personally I use Solufeed 2 : 1 : 4 and the <"
Duckweed Index">, I'm <"
pretty slap-dash with it">, but most members will make up a stock solution that supplies 10 ppm NO3 etc. or use <"
dry dosing with the fertiliser">. We have a <"
lovely spreadsheet">, that includes Solufeed 2 : 1 : 4?
@Zeus. and a <"
user guide">.
Easy enough, this is the
calculation for dry dosing and
teaspoons and I'm going to give the workings for nitrate NO3.
- Solufeed 2 : 1 : 4 is 15% nitrogen (N).
- There are 1000 mg in a gram, so 1 gram of Solufeed contains 0.15g or 150 mg N, "mg / L" and "ppm" are equivalents.
- 15% N equates to ~ 66% NO3- (nitrate), you multiply by 4.43 to go from N to NO3.
- One gram of Solufeed 2 : 1 : 4 contains 665 mg of NO3 and you have a 300 litre tank, so you have 2.22 (665 / 300) ppm (mg / L) NO3 when you add 1 gram of Solufeed 2 : 1 : 4 to your tank. I'm going to say that 2.22 is near enough 2 so 5g (accurately "4.51g") of Solufeed 2 : 1 : 4 will give you ~10 ppm (accurately "11.1ppm") NO3- and
- 5g (or 6g) is pretty near a "teaspoon". So a flat teaspoon of Solufeed 2 : 1 : 4 in 300 litres gives ~10 ppm to 15 ppm NO3 (13.3 ppm if you go with 6g) and that is ~3 ppm (13.3 / 4.43) nitrogen (N).
You can work out how much you've supplied of all the other nutrients from <"
their relative percentages"> (below). The workings for phosphate (PO4---) are here <"
percentage for dry fertilizers"> just because phosphorus (P), potassium (K) and magnesium (Mg) are expressed as oxides in agricultural fertilisers.
View attachment 208512
cheers Darrel