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| Variability in soil exchangeable K levels at a depth interval of 5 to 15 cm (2-6 inches) from sampling areas just 4.6 m (15 feet) apart in one field at a Purdue University Research Farm. Soil series was a contributing - but not the only - factor in accounting for the fertility variability encountered at the beginning of a trial to determine effects of tillage and K placement on lowering variability in seed quality. Photo credits: Brian Ball and Tony J. Vyn. | Deep banding of potassium fertilizer on experimental plots at the Agronomy Center for Research and Education. Photo credit: A. Kline and T.J. Vyn |
K Diagnostics | Alfalfa | Corn | General Crops | Soybeans