TY - JOUR AU - Stromberg, L. K. TI - Need for potassium fertilizer on cotton determined by leaf and soil analyses JF - California Agriculture JO - Calif Agr Y1 - 1960/04/01 VL - 14 IS - 4 SP - 4 EP - 5 PB - University of California Agriculture and Nature Resources SN - 0008-0845 UR - http://www.ucanr.edu/sites/calagjournal/archive/?article=ca.v014n04p4 AB - Fertilizer trials and field studies in 1957, 1958, and 1959 indicated that the soil in some cotton fields in the San Joaquin Valley was deficient in available potassium, and the application of potassium fertilizers significantly increased cotton yields. Where available soil potassium is in low supply, cotton plants show distinctive visible deficiency symptoms.