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The forms and content of K in soil vary according to soil classes and, consequently with its degree of development, which influence the availability o K to plants. The objective of this study was to evaluate the capacity of K supply in 12 soils through four successive crops of maize. The randomized block experimental design was used, with three replications and twenty-four treatments that consisted in a combination of two doses of K (0 and 100 mg dm-3) and 12 soils. After and before the maize crops, sub-samples sized 0.2 dm3 were taken from each pot in order to determine the content of non-exchangeable K (Knt), exchangeable K (Kt) and soluble K (Ks).The less developed, in which were observed a large presence of secondary 2:1 minerals in clay fraction, showed greater ability to supply K to maize plants over the four successive crops; while the more developed where there is a predominance of kaolinite and goethite in clay fraction showed less ability to supply K, especially the sandy ones.

CAPACIDADE DE SUPRIMENTO DE POTÁSSIO EM DOZE CLASSES DE SOLOS EM FUNÇÃO DE CULTIVOS SUCESSIVOS DE MILHO