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Provided by Tom Barr aka Plantbrain.
DIY Tropica Plant Nutrition
Tropica have very kindly provided an analysis of their product so with my calculator at the ready I have calculated a couple of matches. Tropica's TPN+ uses Ammonium Nitrate for it's source of Nitrogen, so I have copied this. The first formulation uses all Ammonium Nitrate and the second uses some Potassium Nitrate to replace the Potassium Sulphate which is used for the Potassium content. The third formulation replaces all the ammonium nitrate with potassium nitrate which results in higher Potassium levels.
Please remember that the first two formulations contain ammonium and so if you wish to use them please proceed with caution and test on a tank with no livestock in. I haven't tested them and are posted for information only.
DIY TPN+ (1)
3.8g Ammonium Nitrate
2.2g Potassium Phosphate (monobasic)
10g Potassium Sulphate
17g Magnesium Sulphate Heptahydrate (Epsom Salts)
0.5g E300 Ascorbic Acid
0.2g E202 Potassium Sorbate
5g EDTA Chelated Trace Elements Mix (TNC Trace, CSM+B)
500ml distilled water
DIY TPN+ (2)
2.9g Ammonium Nitrate
12g Potassium Nitrate
2.2g Potassium Phosphate (monobasic)
17g Magnesium Sulphate Heptahydrate (Epsom Salts)
0.5g E300 Ascorbic Acid
0.2g E202 Potassium Sorbate
5g EDTA Chelated Trace Elements Mix (TNC Trace, CSM+B)
500ml distilled water
DIY TPN+ (3)
48g Potassium Nitrate
2.2g Potassium Phosphate (monobasic)
17g Magnesium Sulphate Heptahydrate (Epsom Salts)
0.5g E300 Ascorbic Acid
0.2g E202 Potassium Sorbate
5g EDTA Chelated Trace Elements Mix (TNC Trace, CSM+B)
500ml distilled water
TPN+ DIY TPN+ (1) DIY TPN+ (2) DIY TPN+ (3)
N 1.34% 1.34% 1.34% 1.34%
P 0.10% 0.10% 0.10% 0.10%
K 1.03% 1.03% 1.03% 3.89%
Mg 0.39% 0.39% 0.39% 0.39%
S 0.91% 0.82% 0.45% 0.45%
B 0.004% 0.01% 0.01% 0.01%
Cu 0.006% 0.002% 0.002% 0.002%
Fe 0.07% 0.08% 0.08% 0.08%
Mn 0.04% 0.02% 0.02% 0.02%
Mo 0.002% 0.002% 0.002% 0.002%
Zn 0.002% 0.01% 0.01% 0.01%
Tropica recommend to dose 5ml per 50 litres of tank water per week.
Following this each dose will add:
DIY TPN+ (1)
0.86ppm NH4
3.0ppm NO3
0.31ppm PO4
1.0ppm K
0.39ppm Mg
DIY TPN+ (2)
0.65ppm NH4
3.7ppm NO3
0.31ppm PO4
1.0ppm K
0.39ppm Mg
DIY TPN+ (3)
5.9ppm NO3
0.31ppm PO4
3.9ppm K
0.39ppm Mg
