. . "CaCO3_ca07" . "CaCO3_ca07"@en . . "Pressure calcimeter (Nelson, 1982)" . . . "Nelson, D.W., and L.E. Sommers. 1982. Total carbon, organic carbon and organic matter. p. 539-579. In A.L. Page (ed.), 1983. Methods of soil analysis. Part 2. 2nd ed. Agron. Monogr. 9. ASA and SSSA, Madison, WI." .