Previous field studies have indicated yield responses of small grain crops to KCl on very high K-testing soils, which were likely due to Cl fertilization. Suggested mechanisms for the involvement of Cl range from plant disease effects to effects on plant water relations. The possibility that climatic and biological environment may interact with the Cl response could make plant and soil diagnostic relationships difficult to interpret. The objectives of this study were to determine the relationships of plant tissue and soil Cl concentrations to hard red spring wheat (Triticum aestivum L.) yield, and to examine possible interactions with plant diseases and water relationships. Field experiments at 14 locations over 3 yr were conducted on Typic Argiustolls, Pachic and Udic Haplustolls, and Pachic Udic and Udic Haploborolls. A critical plant Cl concentration of 1.5 g kg-• for whole plants at head emergence assured 96% of maximum grain yield. Soil Cllevels > 43.5 kg ha-• (60 em) or 75 kg ha-• (120 em)

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