npk ratio

[Feykns]

simple quetion... optimum rule of thumb ratio for flower npk ratio mostly recommended as 1-3-2
.... buuut....
does it refer to the oxide form (p2o5, k20)
or to the elemental p and k??
if the oxides, after doing the math would mean 1-1.308-1.66 => 1-1-1 elemental => that means in ppm 100-131-166??

 

[Hatery1967]

The commonly recommended NPK ratio of 1-3-2 refers to the elemental form of nitrogen (N), phosphorus (P), and potassium (K), not the oxide form (P2O5, K2O). The ratio is expressed in terms of the percentage of each element present in a fertilizer mixture. To convert to ppm, divide the percentage by 10 to get the number of parts per million. In this case, the elemental ratio 1-3-2 would correspond to approximately 100-300-200 ppm of N, P, and K, respectively.

 

[Sasult]

To convert to ppm, divide the percentage by 10 to get the number of parts per million. In this case, the elemental ratio 1-3-2 would correspond to approximately 100-300-200 ppm of N, P, and K, respectively.

To calculate the parts per million from the percentage, multiply the value in percent by 10,000.
1%=.01
.01x 10000= 100
.01/ 10=.001
My dyslexic ass had to read that like 15 times to figure out what was wrong. Anyway, ya it's elemental and the conversion is simple, just add two zeros to the number in the bag.

 

[YellowCanaryConsulting]

Data disagrees with npk numbers. Mono ammonium phosphate offers 6% of the total P value to the plant. Six percent of what you think you're buying. Alot of that is because elemental phosphorus will immediately attach to calcium and create tricalcium phosphate,but your also paying for oxides.

 

[goingrey]

The commonly recommended NPK ratio of 1-3-2 refers to the elemental form of nitrogen (N), phosphorus (P), and potassium (K), not the oxide form (P2O5, K2O). The ratio is expressed in terms of the percentage of each element present in a fertilizer mixture. To convert to ppm, divide the percentage by 10 to get the number of parts per million. In this case, the elemental ratio 1-3-2 would correspond to approximately 100-300-200 ppm of N, P, and K, respectively.

To calculate the parts per million from the percentage, multiply the value in percent by 10,000.
1%=.01
.01x 10000= 100
.01/ 10=.001
My dyslexic ass had to read that like 15 times to figure out what was wrong. Anyway, ya it's elemental and the conversion is simple, just add two zeros to the number in the bag.

"To calculate the parts per million from the percentage, multiply the value in percent by 10,000."
^this is correct

1ppm = 1/1000000 or one part per million
1% = 1/100 or one part per hundred or 10000/1000000 =10000ppm

 

[Hatery1967]

The recommended optimum rule of thumb ratio for flower NPK ratio is often given as 1-3-2. However, when referring to the specific form of NPK, it can be confusing whether it's in the oxide form (P2O5, K2O) or the elemental form. Assuming that the ratio refers to the oxide form, after doing the math, it would result in a ratio of 1-1.308-1.66 in basic form. This means the ppm (per million parts) would be approximately 100-131-166. It's essential to remember that the optimal NPK ratio may vary depending on the type of plant and growing conditions. We can use algebraic equations to solve the problem in the link you provided. On https://plainmath.net/pre-algebra/15801-one-number-is-more-than-times-another-their-sum-is-22-find-the-numbers-14-17 I found math homework answers to many questions. I need help with pre-algebra exercises like when one number is more than several times another, we know their sum, and we must find the number, but this source solves such obstacles. In your case, let x be the smaller number and y be the more significant number. Then we have two equations: y = 5x and x + y = 22. Substituting the first equation into the second equation, we get 6x = 22, so x = 22/6 = 11/3. Thus, the smaller number is approximately 3.67, and the more significant number is around 18.33.

 

[Feykns]

"To calculate the parts per million from the percentage, multiply the value in percent by 10,000."
^this is correct

1ppm = 1/1000000 or one part per million
1% = 1/100 or one part per hundred or 10000/1000000 =10000ppm

... and
1ppm=1mg/l

 

[goingrey]

... and
1ppm=1mg/l

The problem with this is that grams are weight and liters are volume.

If you have dissolved something with a different density than water into water, it won't be true.

 

[Feykns]

got your point... that makes sense

 

[Feykns]

any opinions about that ratio?

n120-p120-k150-mg25-ca150-s60
(in soil)