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Potassium Status of Some Costa Rican Latosols and Andosols and their Response to Potassium Fertilization Under Greenhouse Conditions¹

ABSTRACT

Exchangeable, nonexchangeable, and structural K were determined in A and B horizons of seven Latosols and seven Andosols. Responses to K fertilization using tomato (Lycopersicum sculentum) as indicator plant under greenhouse conditions were studied. Forms of K were correlated with each other as well as with crop response to native and applied K.

Responses to K fertilization, as measured by plant growth and K uptake, were greater for Latosols than for Andosols and greater in B than in A horizons. Larger responses to K for the Latosols, particularly in B horizons, were associated with lower levels of all forms of soil K and higher (Ca + Mg)/K ratios. Conversely, lower responses to K for the Andosols, particularly in A horizons, were associated with higher levels of all forms of soil K and lower (Ca + Mg)/K ratios.

¹ Partly based on the M.S.A. thesis of the junior author at the Interamerican Institute of Agricultural Sciences of the OAS, Turrialba, Costa Rica.

² Soil Scientist assigned by UNDP/FAO to Project 80, IICA, Turrialba, Costa Rica and Graduate Student. Presently, Research Associate, Dep. of Agron., Purdue Univ., and Graduate Student at Iowa.

Received for publication February 13, 1974. Accepted for publication September 19, 1974.