FIG. 1.

Geographical distribution of representative locations where acid soils were sampled in Argentina and Uruguay. The sampled area extends over the provinces of Buenos Aires, Córdoba, La Pampa, and Santa Fe in Argentina and over four different Departments in Uruguay. Representative sampled locations in both countries are shown. Numbers in the map refer to the main cities located close to each place of sampling. Numbers in the map refer to the following cities: 1, Arrecifes; 2, Carmen de Areco; 3, San Pedro; 4, Pergamino; 5, La Plata; 6, Castelar; 7, Reconquista; 8, Rafaela; 9, San Francisco; 10, Manfredi; 11, Anguil; and 12, General Pico (all in Argentina); and 13, Paysandú; 14, Colonia; and 15, Canelones (all in Uruguay).