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Subject:  Potassium application rate

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Baisley Pumpkin

Edmundston, NB, Canada


I am trying to find a "ball park" application rate for potassium. Does anybody have any information on this?

I do not have a soil analysis, so I have do idea of my current K status.

I am using soluble 6-11-31 at the rate of 1 oz per 90 sq feet (3,2 g / m2).

Thanks for your help!

New-Brunswick, CAN

7/31/2018 6:01:17 PM

Glenoma Kins

Southwest WA

ballpark i would say use ten pounds of that over 1000 sq ft ... Not all at once unless your plant is clearly very deficient then put it all on and buy ten more pounds lol

8/3/2018 1:35:30 AM


Osseo, MN

What product are you using that is 6-11-31? Store bought or online?

8/3/2018 1:04:47 PM

Orangeneck (Team HAMMER)

Eastern Pennsylvania

Am I the only person that thinks 1 oz per 90 square feet is insanely high? I use 1 oz per 1000 square feet ... growth products 0-0-25. And I wouldn’t typically use that until day 50 at least, although I must admit it keeps crossing my mind lately.

8/3/2018 1:47:43 PM

North Shore Boyz

Mill Bay, British Columbia

Don’t use 10 lbs of water soluable 6-11-31 over 1000 sq ft. My apologies to contradict Glenomkins if he didn’t read your question properly, but that is a crazy amount IMO without knowing more about your soil, previous amendments or how your soil was prepared in the Spring.

8/3/2018 2:57:57 PM

North Shore Boyz

Mill Bay, British Columbia

Richard, how big is your plant, how old is the pumpkin and what does the label recommend for application?

I typically cut the recommendation in 1/2 and use whatever I am using more frequently. If the recommendation on the product is once a week at 1 oz per 90 sq ft, I would likely cut that in 1/2 and apply 2 times per week, but then again I am a conservative grower who has not broken 1200 lbs yet.

8/3/2018 3:06:07 PM

Glenoma Kins

Southwest WA

I was reading that as what he might need for the season. Just an uneducated guess —sorry if it’s wrong!

8/3/2018 7:58:45 PM

North Shore Boyz

Mill Bay, British Columbia

I was going to leave this alone and was hoping that Baisley Pumpkin would see the replies and expand this dialogue but I guess he found better things to do.

When growers ask questions on these message boards, we are not asking to find out “just an uneducated guess”. It’s not a guessing game, and will not help anyone with guesses. We should all be thankful that actual experienced growers will try their best to give you a factual, knowledge based answer and not the first thing someone blurts out.

8/13/2018 11:30:14 AM


Watlington, UK

Impossible question to answer without a soil analysis... why not get one done?

8/15/2018 4:20:06 PM

Baisley Pumpkin

Edmundston, NB, Canada

Sorry for the delay!!! I checked the board for a few days and saw no replies. I thought my question might be of no interest to other growers. Thank you all for your help! Here goes...

Sawjaws : I bought it at my local garden supply. It is also a farm supplier. Here is the link. https://www.plantprod.com/product/plant-prod-6-11-31-hydroponic/

North Shore Boyz : The plant is 30' x 32'. The pumpkin is at day 40 @ 567 lbs. The label only has a dilution rate to achieve a determined ppm concentration. (It is for hydroponics.) "RATE OF APPLICATION: To make a solution containing 200 ppm Nitrogen add to each 100L of solution: 115g Plant-Prod® 6-11-31".

Thanks for the recommendation of splitting the fertilizer in two applications.

Gerald : By the time I get the lab results, I will be too far along to benefit from adjusting the potassium level. I will have this done this fall.

I will email PlantProd and try to get their opinion on the subject. I will post their reply here.


8/15/2018 9:47:34 PM

North Shore Boyz

Mill Bay, British Columbia

Since your using a specialty product, meant for soilless conditions, contacting the manufacturer is the best option.

That formula used for 200 ppm nitrogen would be giving you roughly 200 ppm nitrogen, 400 ppm phosphorus and 1000 ppm Potassium which are numbers too high for me to feed my plants.

Again, to be safe cut that recommendation by 1/2 or less.

Good luck, you’ve got a great pumpkin going.

8/16/2018 12:01:20 AM

Total Posts: 11 Current Server Time: 8/21/2019 8:21:49 PM
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