ISU changes potassium recommendations

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As post-harvest soil test and fertilization season begins, gowers and ag retailers need to be aware that Iowa State University recently announced changes to potassium (K) fertility guidelines based on moist soil measurements. These may be viewed online at:
http://www.extension.iastate.edu/CropNews/2013/0920mallarinosawyer.htm

While it has been known for decades that drying can change the chemistry of soil, altering the amount of extractable potassium (K), it's just been in the last two years that Solum entered the market with a commercially viable process measuring soil in its field moist state.

The new potassium (K) recommendations document from Iowa State notes, "Research has indicated that the moist K test is more reliable than the test based on dried samples and is a better predictor of crop K fertilizaton need."

click image to zoom Speaking at a mid-year conference, Iowa State Professor of Soil science and Nutrient Management, Dr. Antonio Mallarino, reminded the audience that soil test interpretation classes should be understood in terms of probability of response. “The amounts of K extracted can differ greatly between moist and dried samples, and the differences change greatly across soil series, the soil-test K levels, and soil conditions related to drainage and moisture content cycles.” While other tests are still available for potassium, he noted that they encourage the use of the moist test for K because it has more predictive value and a more consistent meaning across different soils and conditions.

Solum Inc. opened a moist soil measurement facility in Ames Iowa in 2012 to offer this test and other advanced measurements. In collaboration with Winfield Solutions, Mosaic, and other industry partners, it has conducted trials in more than 15 states and four countries.

For more information visit www.solum.ag.


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Robert Miller    
CO-NE  |  October, 14, 2013 at 12:06 PM

Please note that the moist soil K test supported by Iowa State University and provided by Solum is limited to Iowa only. No other state cross the corn belt recognizes the moist K soil test, and no calibration data is available outside of Iowa. -R

Dale Rush    
Salinas  |  October, 14, 2013 at 01:44 PM

The moist soil K test is probably a step in the right direction but it still does not address a key issue, which is the rate of release of K from the soil into the soil solution. Soils can be high in sorbed or bound K and have low rates of release and vice versa. Things do change though, it is now acceptable (even recommended) to do potassium water runs.


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