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Potassium deficiency symptoms occur on Acala SJ-2 cotton when the soils, by test, are not deficient and when other crops grow well without additions of potassium. Field experiments in 1988, 1989 and 1990 resulted in significant lint yield increases when the soils were fumigated with methyl bromide and chloropicrin. Foliar potassium deficiency symptoms were drastically decreased without altering soil potassium levels.doi:10.3733/ca.v046n03p17 fatcat:ybojx5aonvcihevil6hg2vusoe