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#3434326 - 11/03/13 07:55 PM Re: Testing Back. [Re: smstone22]
drrxnupe
8 Point


Registered: 02/15/09
Posts: 1014
Loc: Nashville, TN & Oxford, MS

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 Originally Posted By: smstone22
drrxnupe, that really isnt correct. Its % of N, P2O5, and K20 on the bag. So 100 lbs of 10-10-10 would have 10 lbs N, 4.36 lbs P, and 8.3 lbs K.


Sorry Stone...you're incorrect. The example below was taken out of the QDMA book. It's the exact example you mention.




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#3434333 - 11/03/13 07:56 PM Re: Testing Back. [Re: drrxnupe]
drrxnupe
8 Point


Registered: 02/15/09
Posts: 1014
Loc: Nashville, TN & Oxford, MS

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 Originally Posted By: drrxnupe
 Originally Posted By: MickThompson

Just remember the number on the bag is %, not the # in the bag.



The number (%) on the bag is pounds of each content per 100 pounds of the mix. For example...a 50 lb bag of 15-15-15 means that there is 7.5 lbs of N, 7.5 lbs of K, and 7.5 lbs in the one bag.


In my example 15-15-15 in 50 lbs of fertilizer gives you 7.5 lbs of each. 100 lbs of 15-15-15 ( two 50 lbs bags) gives you 15 lbs of each.

Sorry to throw you off Rat :). When I took medical math in pharmacy school, I struggled with it as well.


Edited by drrxnupe (11/03/13 07:58 PM)

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#3434528 - 11/03/13 08:48 PM Re: Testing Back. [Re: drrxnupe]
primos32
6 Point


Registered: 12/26/07
Posts: 859
Loc: Savannah, TN

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 Originally Posted By: drrxnupe
 Originally Posted By: smstone22
drrxnupe, that really isnt correct. Its % of N, P2O5, and K20 on the bag. So 100 lbs of 10-10-10 would have 10 lbs N, 4.36 lbs P, and 8.3 lbs K.


Sorry Stone...you're incorrect. The example below was taken out of the QDMA book. It's the exact example you mention.







I think I will agree with Stone here. He is pointing out the exact molecular weight of the compounds for P in P2O5 and K in K20, which is 43.6% and 83% respectively. That in fact would give him the actual amount he stated for his example for P and K.

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#3434544 - 11/03/13 08:56 PM Re: Testing Back. [Re: primos32]
primos32
6 Point


Registered: 12/26/07
Posts: 859
Loc: Savannah, TN

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I also see your in Hardin Co from the soil report. Hardin Co. Co-op should be able to come lime it for you if your doing 14 acres. $32 per ton last time I checked, that is if you don't have the equipment to do it. If you have any questions just send over a PM.
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#3434658 - 11/03/13 09:39 PM Re: Testing Back. [Re: primos32]
drrxnupe
8 Point


Registered: 02/15/09
Posts: 1014
Loc: Nashville, TN & Oxford, MS

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 Originally Posted By: primos32


I think I will agree with Stone here. He is pointing out the exact molecular weight of the compounds for P in P2O5 and K in K20, which is 43.6% and 83% respectively. That in fact would give him the actual amount he stated for his example for P and K.



Gotcha...from a molecular weight standpoint that is correct. I've never had a soil test so i didn't realize that they give N-P-K amt recommendations down to the molecule weight level.

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#3434680 - 11/03/13 09:56 PM Re: Testing Back. [Re: drrxnupe]
primos32
6 Point


Registered: 12/26/07
Posts: 859
Loc: Savannah, TN

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 Originally Posted By: drrxnupe
 Originally Posted By: primos32


I think I will agree with Stone here. He is pointing out the exact molecular weight of the compounds for P in P2O5 and K in K20, which is 43.6% and 83% respectively. That in fact would give him the actual amount he stated for his example for P and K.



Gotcha...from a molecular weight standpoint that is correct. I've never had a soil test so i didn't realize that they give N-P-K amt recommendations down to the molecule weight level.


The one he has looks to be the one from the Tennessee lab, which gives you a unit/pound type of recommendation. An example would be 40 lbs of P. Since the molecular weight of P in P2O5 is only 43.6% of the compound, you very well could only be spreading out half of what is recommended if you disregard the weight calculation Stone pointed out. It's impossible to get it exactly right but being as close as possible to recommended is best. Especially when you are spending so much these days on inputs.


Edited by primos32 (11/03/13 10:02 PM)

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#3438465 - 11/06/13 04:31 AM Re: Testing Back. [Re: drrxnupe]
smstone22
16 Point


Registered: 01/11/04
Posts: 16948
Loc: Allardt, TN

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 Originally Posted By: drrxnupe
 Originally Posted By: smstone22
drrxnupe, that really isnt correct. Its % of N, P2O5, and K20 on the bag. So 100 lbs of 10-10-10 would have 10 lbs N, 4.36 lbs P, and 8.3 lbs K.


Sorry Stone...you're incorrect. The example below was taken out of the QDMA book. It's the exact example you mention.







Im not incorrect at all. Phosphate and Potash are not pure P phosphorus and K Potassium. They have a percentage of P and K in them, the percentages mentioned.


Edited by smstone22 (11/06/13 04:39 AM)
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