Soil Management

Soils with “Adequate” Potassium Levels May Still Need Application.

eKonomics News Team

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Midwest recommendations often suggest growers need not apply potassium if soil test levels are above 170 ppm, but recent research has shown that application could pay off in a big way. Results from Dr. Robert Miller’s KRx project revealed that significant yield responses can be achieved from application in soils generally considered to have “adequate” soil test potassium levels – meaning potassium may be much more limiting than many growers think.

Yield Increases As A Result Of Applied K.

The research revealed yield responses to applied K fertilizers on soils as high as 290 parts per million, which far exceed what the land grant university critical values are.

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