Control of potassium deficiency syndrome in cotton by soil solarization
William L. Weir, University of California
Richard H. Garber
James J. Stapleton
Roland J. Wakeman
James E. DeVay
California Agriculture 43(3):26-28.
Potassium-deficiency symptoms in cotton are widespread in California and become most apparent in leaves during heavy demand by developing bolls. Potassium fertilizers may reduce the problem, but the main cause may be pathogenic organisms in the soil. Soil solarization, which controls soilborne pathogens of cotton, also controls the potassium deficiency problem without appreciable changes in the availability of potassium to cotton roots.
William L. Weir is Farm Advisor, University of California Cooperative Extension, Merced County; Richard H. Garber is Plant Pathologist, U.S. Cotton Research Station, Shafter; James J. Stapleton is Area IPM Specialist, UC Cooperative Extension, Stanislaus County; Reuben Felix-Gastelum is Research Assistant, Department of Plant Pathology, UC Davis. Roland J. Wakeman is Staff Research Associate, Department of Plant Pathology, UC Davis. James E. DeVay is Professor, Department of Plant Pathology, UC Davis.