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Numerous experiments intended to clarify the fertilizing questions of peat land have been established at the Experimental Station of Leteensuo and carried on through fairly long periods without interruption. Short-time reports of these experiments have been given in several connections. The results obtained over longer periods have recently been analysed with reference to the Sphagnum bog fertilizing tests, which have thrown light on the effects of nitrogen and phosphorus as well as potassium fertilization (5, 6). Moreover, Takala (6) has reported on the experiments arranged with a view to clarifying the effects of phosphate fertilization. In the following, the significance of potassium fertilization on the fen area of the Experimental Station of Leteensuo will be described on the basis of the results derived from three field tests. The persons supervising the experiments in different years have been mentioned in a previous publication (4, p. 2). With reference to shorter periods, these tests have been analysed by Malm (3) and Hir-

Fen fertilization with potash in the light of tests at Leteensuo experimental station