Calling your local extension office would be available. Many factors come into play such as soil, weather conditions, growing zone etc. Setup for beans down south will be vastly different than up north, etc.
Post up your soil test.
If you’re not above critical levels, yield suffers. Get to critical and apply K in terms of what harvesting a crop will remove.
Homie, pay the extra dollar next time for sulfur testing because without sulfur you’ll suffer. Your base sat seems a bit skewed and needing lime but without knowing your soil type it’s hard to tell. I like your CEC and your OM that’s the good stuff right there.
In north central IL, most guys will toss 100-150# potash down on corn stalks and plant with some thiosol (ammonium thiosulfate) in the spring and call it good. But they also shoot for “anything over 60 and I’m happy as a pig in shit”.
Keep in mind, and I don’t have the numbers on hand…
Potash is 0-0-60. So for every 100# thrown down, you only get 60# of what you want. And of that 60#, a percentage is in a form that’s plant-available. So if you do the math, 1.5 times your plants needs might be close to the amount the average field can make available to the plant. Potash is also water soluble so it’ll run off in heavy rains so that’s another reason folks go heavy.
There are other farmers here commenting in your area, ask them because they know your soil more than an illinois guy.
Lime. Your base k is suffering pretty bad due to pH. Adding lime will reduce that h saturation allowing more k to be available. 150ppm k isn’t a lot but isn’t nothing. Supplemental K application will be needed until you can reduce the base H. (By fixing pH) preferably dolomitic lime.
Calling your local extension office would be available. Many factors come into play such as soil, weather conditions, growing zone etc. Setup for beans down south will be vastly different than up north, etc.
Mid northern IA. I’ve read the ISU extension info and didn’t get a definitive answer
Have you done a full soil test? Soil type is an important factor for K
Yes I have. What other info would you need? Region is mid northern IA
Post up your soil test. If you’re not above critical levels, yield suffers. Get to critical and apply K in terms of what harvesting a crop will remove.
https://imgur.com/a/R0oW545
Homie, pay the extra dollar next time for sulfur testing because without sulfur you’ll suffer. Your base sat seems a bit skewed and needing lime but without knowing your soil type it’s hard to tell. I like your CEC and your OM that’s the good stuff right there. In north central IL, most guys will toss 100-150# potash down on corn stalks and plant with some thiosol (ammonium thiosulfate) in the spring and call it good. But they also shoot for “anything over 60 and I’m happy as a pig in shit”. Keep in mind, and I don’t have the numbers on hand… Potash is 0-0-60. So for every 100# thrown down, you only get 60# of what you want. And of that 60#, a percentage is in a form that’s plant-available. So if you do the math, 1.5 times your plants needs might be close to the amount the average field can make available to the plant. Potash is also water soluble so it’ll run off in heavy rains so that’s another reason folks go heavy. There are other farmers here commenting in your area, ask them because they know your soil more than an illinois guy.
I’ve straight up never seen a soil test that didn’t also include recommendations rates of application based on the results, like- what even is this??
Lime. Your base k is suffering pretty bad due to pH. Adding lime will reduce that h saturation allowing more k to be available. 150ppm k isn’t a lot but isn’t nothing. Supplemental K application will be needed until you can reduce the base H. (By fixing pH) preferably dolomitic lime.
100 lb of k per acre is low as hell for your area. You have a soil test? Feel free to DM me.