Potatoes (Solanznn tuberosum L.) were glown on a soil with a pH of 4'5 and containing 12 ppm of exchangeable manganese, and in sand cultures where the manganese concentration ranfed from 02 to 10 ppm. Potassium was sgnplied in the forms of chloride, sulfate, carbonate, nitratc and hydroxide. On unlimed soils, the yields of tubers were in the following order: K,CO, > K-gtI
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