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Precision agriculture technologies [grain yield monitors, georeferenced soil sampling, and geographical information systems (GIS)] are useful tools to study the effect of fertilization on yield and soil-test values across the landscape. A study based on oneto three-year strip-trials (63 site-years) was conducted from 2001 to 2007 in Iowa to evaluate the effects of K fertilization on corn (Zea mays L.) and soybean (Glycine max L. Merr.) grain yield and post-harvest soil-test K (STK) measured with the ammonium acetate procedure. Two K treatments (0 and 168 kg K ha) were replicated three to four times at each site. Soil samples were collected before K application (one composite sample every 0.07 to 0.20 ha) and also from non-fertilized strips before oneand two-year trials. Potassium fertilization increased grain yield as evaluated by strip averages in 21 of 63 site-years, and only when STK of significant portions of the field tested Optimum or lower (≤ 171 mg K kg). Yield responses for field areas testing within different STK interpretation classes showed a differential response in seven site-years with a strip-average response and in seven site-years

Soil and fertilizer potassium impacts on corn and soybean grain yield, potassium uptake, and within-field grain yield variation