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Ammonium Sulfate

5045 Views 9 Replies 6 Participants Last post by  Mightyquinn
Are there any good places to buy Ammonium Sulfate fertilizer online?
I am having trouble finding it locally.
My PH is always high and limits nutrient absorption.
I would like to try it.
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Ridgerunner said:
Indexed common fertilizer acidifying effects:

Sulfur coated Urea (38-0-0): 1.18
Ammonium Sulfate (21-0-0): 1.10
Urea (46-0-0): 0.81
Ammonium Nitrate (34-0-0): 0.60

Higher numbers indicate greater acidifying effect. For reference, the index of Elemental Sulfur is: 3.12. One pound of sulfur will neutralize 3.12# of 100 CCE limestone; therefor, 1# of Ammonium Sulfate (21-0-0) will neutralize 1.10 pounds of 100 CCE limestone and 5# of 21-0-0 (equal to an application of 1.05 lbs/k of N) would neutralize 5.5 lbs of 100 CCE of limestone. Theoretically, of course. :)
Tellycoleman said:
But it looks like sulfur coated urea will do the job as well.
Yes and no. The No: To get your 1# of N/k you'll apply almost 5# of 21-0-0 product for a total neutralizing effect of 5.5 vs the application of only 2.6# of 38-0-0 to get 1# of N/k for a total neutralizing effect of 3.1. The Yes: No one expects to be able to make a dent in their calciferous soil lime content, but the advantages of temporary reduction in soil solution aren't likely to be that great between the two; However, the organic acidifying component of the Sulfur in the coated urea may actually be more advantageous for duration. If that makes sense.
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