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Lodi, California

Hi all. I was wondering, if 0-0-50 is 50% k, what is the other 50% made of? I have calculated that I need 11 lbs of pure k(22 lbs 0-0-50) to raise my k from 180 ppm to 600 ppm. Does this sound right?


Ashton

3/8/2013 10:34:10 AM

Lodi, California

Oops, I forgot, my patch is 600 sf

3/8/2013 11:15:02 AM

Menomonie, WI (mail@gr8pumpkin.net)

The other half is sulfate...

3/8/2013 12:57:07 PM

Menomonie, WI (mail@gr8pumpkin.net)

Which I am sure it says right on the label "Potassium Sulfate" or "Sulfate of Potash"

3/8/2013 12:59:37 PM

Colorado

Careful does it with potassium.You have to consider Fe,mn and Na levels.Try to get to ideal #'s over two or three seasons. Just my opinion.

3/8/2013 1:21:45 PM

Bellevue, Ohio

Usually there is 17%(minimum) sulfur , 50%(minimum) K2O, and .08 CL(max) and the rest is fillers or other minerals of no nutrient value.

3/8/2013 1:49:03 PM

canal winchester ohio

Turkey is right Ashton, I've always went by each lb having .50 lbs potash and .18 lb sulfur

3/8/2013 2:12:23 PM

Paradise Mountain, New York

A lot depends on your soil test CEC. If your CEC is low, it takes less. If your CEC is high like mine that runs in the 50's all the years I have it tested, it takes a lot more. Best advice, take it to a local fertilizer place that sales thousands of tons to farmers and they will tell you the right amount and you can buy it cheaper there.

3/8/2013 2:21:55 PM

Picton,ON (j.vincent@xplornet.ca)

Hi Ashton,

You will need a lot more than that to raise your soil K level to 600 ppm. As a rule it takes 8-16 lbs of actual potash to raise the test by 1 ppm.

Your application of 11 lbs of 0-0-50 is equal to 400lbs actual potash per acre.

You would require aproxomatly 75lbs of actual or 150lbs of 0-0-50 to raise your level by that much on your 600ft2. This is in addition to plant removal, which could be as much as 6-800lbs per acre on AGP's.

I would not recomend doing this in one shot.

https://www.ipni.net/ppiweb/agbrief.nsf/5a4b8be72a35cd46852568d9001a18da/3057b33247a7a85e852569670056ec4a!OpenDocument

My bigger question is why do you want to raise your test so high. Likely unnecessary.

3/8/2013 3:15:22 PM

Springfield, VT

Be careful on adding too much available Potassium it can cause early maturation. Pumpkins use about 2 lbs of N, 3 lbs of P and 6 lbs of K per 1000 sq. ft. see the fact sheet below. More is not always better.

http://ohioline.osu.edu/hyg-fact/1000/1646.html

3/8/2013 3:49:12 PM

President - GPC

1632 Pounds per acre coming from calcarerous soil and adding crappy horse manure...648 poundZ per year usage .....in 6.5 years Joe we can start adding more.

TEST YOUR COMPOST!

3/8/2013 4:31:30 PM

Lodi, California

Ok, thanks for the help!

Linus, I haven't bought the product yet so I don't have the label.

3/8/2013 5:03:31 PM

Lodi, California

Oops, I didn't get the recent posts. 150 lbs? I thought I need 11 lbs of pure k for my patch? Here is how I calculated how much I needed.
Take how much in ppm I need to raise my k to (320 to 500 ppm) multiplied it by 2 to get lbs per acre (640 lbs) divided it by 43000( how many sf in a acre) then I multiplied it by 600(how many sf my patch is) what did I do wrong? I asked Mr. Checkon if 20 lbs is the right ammount and he said that that sounded right

Ashton

3/8/2013 5:12:19 PM

Upa Creek, Mo

150 pounds of 0-0-50 in 600 square feet? huh

3/8/2013 5:33:43 PM

Boscawen, NH

Ashton,
Very nice job with your math, you are right on the money if your goal is to raise you ppm up close to 600. You would need anywhere from 22 lbs. to 30 lbs. depending on the depth of soil (6" or 8"). This amount of SOP would also raise your sulfur levels by 135-180 ppm. The advice others have given should be considered since you don't want to raise your K levels just for the sake of having more. Your nutrients should be balanced.

3/9/2013 1:05:48 PM

Picton,ON (j.vincent@xplornet.ca)

Your math is correct on establishing available lbs of potassium converted from PPM, however the conversion of available potassium to lbs applied is not directly correlated (see my link above).

That all said, your recommendation of 22 lbs 0-0-50 per 600 ft2 patch should be fine, but don’t expect it to raise your ppm k level a whole lot. Your 22 lb application is equal to about 790 lbs per acre. Plant removal on commercial pumpkins has been documented at 6.8 lbs acatual K per ton of pumpkin produced. Plant removal on AGP’s is somewhere between 250-and 500 lbs per acre, depending on yield. That means if you are fertilizing for a 1000 lb pumpkin on a 600 ft2 plot, the pumpkin will remove 244 lbs potassium. If you are fertilizing for a 2000 lb pumpkin, you need 488lbs.

Your application of 22 lbs of 0-0-50 will more than satisfy plant removal for a 2000 lbs pumpkin yield goal, however only expect it to raise your soil test level by 25-50ppm

3/10/2013 12:25:57 PM

Lodi, California

Ok, Sorry about all the questions. So I need 175 lbs, not 30 per 600 sf?! I have a 60 lb bucket of it. Thanks!

Ashton

3/19/2013 8:07:14 PM

ShagHarbour n,s canada

geez ash why is your soil so depleted is it gravel lol

3/19/2013 8:12:24 PM