Mobilization of non-exchangeable potassium and sodium in a calcareous soil during plant growth

Estimation of non‐exchangeable potassium in soils using a cation‐exchange resin

“…6 The relative importance of the non-exchangeable fraction depends on the types and quantity of clay minerals p r e~e n t .~.~ These two fractions constitute only a small part of the total potassium, the remainder being unavailable to plants.…”

The Effects of Ammonium Nitrate and Urea on the Release of Non-Exchangeable Potassium by Eight Eastern Prairie Soils During Continuous Cropping in the Greenhouse

“…(1957) found that the amount of nonthat plant species differ in their capacities to exchangeable potassium supplied to a crop extract nutrients from soils. In this respect was greatest for soil with high exchangeable Fox and Kacar (1965) found that legumes potassium levels and a relatively large perwere more effective in mobilizing rron-ex-centage of clay. Albrecht (1943) On the other hand, Murdock and Rich (1964) (1970) reported that inch-rsion of urea and ammonium nitrogen in plant nutrient solutions hud no effect on the potlssium content of tobacco leaves.…”