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Topic: Fertilizer formulation question (ppm)  (Read 2061 times)

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Offline mij

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Fertilizer formulation question (ppm)
« on: October 11, 2016, 11:55:12 AM »
Fertilizer label reads: Contains by weight Nitrogen 10%, Phosphate (P2O5) 5%, Potash (K2O) 14%, Calcium 6%, Magnesium 2%, Sulfur 3%, Iron 0.12%, Manganese 0.05%, & Molybdenum 0.002%. Can anyone give me these 9 elements rounded in ppm if I add 10 grams of fertilizer per gallon of water. so that I can check my math? I'm a bit rusty. Rounding to even parts per million is sufficient. Thanks

Offline Borek

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Re: Fertilizer formulation question (ppm)
« Reply #1 on: October 11, 2016, 12:13:05 PM »
It works other way around: show what you got and we will tell if it is correct.
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Offline mij

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Re: Revised fertilizer formulation question (ppm)
« Reply #2 on: October 11, 2016, 10:06:45 PM »

Fertilizer label reads: Contains by weight Nitrogen 10%, Phosphate (P2O5) 5%, Potash (K2O) 14%, Calcium 6%, Magnesium 2%, Sulfur 3%, Iron 0.12%, Manganese 0.05%, & Molybdenum 0.002%. Adding 10 grams of this fertilizer to 1 gallon of water, I calculate ppm (rounded to whole integer) for each element to be N-264 ppm, P-58 ppm, K-307 ppm, Ca-160 ppm, Mg-53 ppm, S-79 ppm, Fe-32 ppm, Mn-13 ppm, & Mo-0.53 ppm. Can anyone verify these figures? I'm a bit rusty thanks

Offline AWK

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Re: Fertilizer formulation question (ppm)
« Reply #3 on: October 12, 2016, 12:09:47 AM »
Quote
Magnesium 2% ... & Molybdenum 0.002%

and
Quote
Sulfur 3%, Iron 0.12%
Compare nitrogen and phosphate, also sulfur and iron
Quote
Mg-53 ppm ... & Mo-0.53 ppm

 &
Quote
S-79 ppm, Fe-32 ppm
At least one element in these pairs should be wrong.
« Last Edit: October 12, 2016, 11:12:58 AM by AWK »
AWK

Offline Vidya

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Re: Fertilizer formulation question (ppm)
« Reply #4 on: October 12, 2016, 09:49:42 PM »

Fertilizer label reads: Contains by weight Nitrogen 10%, Phosphate (P2O5) 5%, Potash (K2O) 14%, Calcium 6%, Magnesium 2%, Sulfur 3%, Iron 0.12%, Manganese 0.05%, & Molybdenum 0.002%. Adding 10 grams of this fertilizer to 1 gallon of water, I calculate ppm (rounded to whole integer) for each element to be N-264 ppm, P-58 ppm, K-307 ppm, Ca-160 ppm, Mg-53 ppm, S-79 ppm, Fe-32 ppm, Mn-13 ppm, & Mo-0.53 ppm. Can anyone verify these figures? I'm a bit rusty thanks

Can you show how you calculated it? Just show one calculation...

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