Not sure if anyone has done a list or comparison of the strength and ppm of popular bloom fertilizers. So i thought id share one. I decided to make my own fertilizer to better match my current soil conditions so i brushed up on my chemistry math and did some study.
I wanted to compare what companies were supplying with their recommended dosages and strength. So i looked up all the product safety files and found what i could on their specific gravity rating. With this and their garenteed analyasis plus dosage rating i could calculate their ppm.
I had to make sure on a few things as standards are a little wally with fertilizer companys. Iv assumed that all products rate their potassium and phosphorus in p205 & k20 and as have such compensated for this difference. Also the listed ppm is in a conversion factor of 0.50 or hannah. My preferred standard but if it were my way id have the readings in EC. The rated NPK system is also measured in w/w which seems to the the defacto standard now days, although sometimes you can find w/v products.
Also the conversion may be rounded or wrong because of incorrectly supplied density or dosage values for a product. But i think its accurate and should be within 10 or 20 ppm.
But again it could be wrong and what you measure with a ec/tds might differ because of other variables.
Dynagrow Bloom
NPK 3-12-6
Density/SG 1.43
Nitrogen 170 ppm
Phosphorus 300 ppm
Potassium 285 ppm
Hawaiian Bud And Bloom
NPK 5-50-17
Density/SG 1.7
Nitrogen 120 ppm
Phosphorus 490 ppm
Potassium 316 ppm
Advanced Nutrients Ph Perfect Bloom
NPK 1-3-5
Density/SG 1.13
Nitrogen 45 ppm
Phosphorus 60 ppm
Potassium 187 ppm
Advanced Nutrients Big Bud
NPK 0-1-3
Density/SG 1.13
Nitrogen 0 ppm
Phosphorus 10 ppm
Potassium 56 ppm
General Hydroponics Flora Bloom
NPK 0-5-4
Density/SG 1.16
Nitrogen 0 ppm
Phosphorus 100 ppm
Potassium 155 ppm
Fox Farm Big Bloom
NPK 00.1-0.3-0.7
Density/SG 0.97
Nitrogen 3 ppm
Phosphorus 92 ppm
Potassium 215 ppm
Fox Farm Tiger Bloom
NPK 2-8-4
Density/SG 1 (Unknown)
Nitrogen 105 ppm
Phosphorus 422 ppm
Potassium 211 ppm
Canna Aqua Flores
NPK 4-4-11
Density/SG 1 (Unknown)
Nitrogen 138
Phosphorus 60
Potassium 316
Compared to what we are used to, it appears that fertilizer products play it quite safe. No surprise there. I wanted to list fox farm bloom products but was unable to find density information on them. If anyone finds a error thats too big to ignore or has information on other fertilizer products including specific density, please let me know so i can add it to my list.
Thanks.
I wanted to compare what companies were supplying with their recommended dosages and strength. So i looked up all the product safety files and found what i could on their specific gravity rating. With this and their garenteed analyasis plus dosage rating i could calculate their ppm.
I had to make sure on a few things as standards are a little wally with fertilizer companys. Iv assumed that all products rate their potassium and phosphorus in p205 & k20 and as have such compensated for this difference. Also the listed ppm is in a conversion factor of 0.50 or hannah. My preferred standard but if it were my way id have the readings in EC. The rated NPK system is also measured in w/w which seems to the the defacto standard now days, although sometimes you can find w/v products.
Also the conversion may be rounded or wrong because of incorrectly supplied density or dosage values for a product. But i think its accurate and should be within 10 or 20 ppm.
But again it could be wrong and what you measure with a ec/tds might differ because of other variables.
Dynagrow Bloom
NPK 3-12-6
Density/SG 1.43
Nitrogen 170 ppm
Phosphorus 300 ppm
Potassium 285 ppm
Hawaiian Bud And Bloom
NPK 5-50-17
Density/SG 1.7
Nitrogen 120 ppm
Phosphorus 490 ppm
Potassium 316 ppm
Advanced Nutrients Ph Perfect Bloom
NPK 1-3-5
Density/SG 1.13
Nitrogen 45 ppm
Phosphorus 60 ppm
Potassium 187 ppm
Advanced Nutrients Big Bud
NPK 0-1-3
Density/SG 1.13
Nitrogen 0 ppm
Phosphorus 10 ppm
Potassium 56 ppm
General Hydroponics Flora Bloom
NPK 0-5-4
Density/SG 1.16
Nitrogen 0 ppm
Phosphorus 100 ppm
Potassium 155 ppm
Fox Farm Big Bloom
NPK 00.1-0.3-0.7
Density/SG 0.97
Nitrogen 3 ppm
Phosphorus 92 ppm
Potassium 215 ppm
Fox Farm Tiger Bloom
NPK 2-8-4
Density/SG 1 (Unknown)
Nitrogen 105 ppm
Phosphorus 422 ppm
Potassium 211 ppm
Canna Aqua Flores
NPK 4-4-11
Density/SG 1 (Unknown)
Nitrogen 138
Phosphorus 60
Potassium 316
Compared to what we are used to, it appears that fertilizer products play it quite safe. No surprise there. I wanted to list fox farm bloom products but was unable to find density information on them. If anyone finds a error thats too big to ignore or has information on other fertilizer products including specific density, please let me know so i can add it to my list.
Thanks.
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