TY - JOUR AU - Tyler, K. B. AU - Lorenz, O. A. AU - Nelson, P. M. AU - Bishop, J. C. TI - Soil potassium for potatoes: Depletion of soil potassium by cropping necessitates potash fertilization in certain areas of Kern and Tulare counties JF - California Agriculture JO - Calif Agr Y1 - 1959/06/01 VL - 13 IS - 6 SP - 8 EP - 8 PB - University of California Agriculture and Nature Resources SN - 0008-0845 UR - http://www.ucanr.edu/sites/calagjournal/archive/?article=ca.v013n06p8 AB - Fertilizer experiments–and a nutrient survey during the 1958 spring season–showed that some fields in Kern and Tulare counties are being depleted of exchangeable soil potassium to the point of deficiency, through frequent cropping to potatoes.