Submitted to: World Congress of Soil Science
Publication Type: Abstract Only
Publication Acceptance Date: 8/13/2001
Publication Date: 8/13/2002
Citation: OLNESS, A.E., KUNZE, B., LIESER, M., WEISER, H., RINKE, J.L. PRECISION CHEMICAL ANALYSIS OF SOILS TO SUPPORT PRECISION MANAGEMENT DECISIONS. WORLD CONGRESS OF SOIL SCIENCE. 2002. ABSTRACT PAPER NUMBER 125(1-8). Interpretive Summary:
Technical Abstract: Technological advances in application of fertilizers and crop cultivars have expanded the potential for more precise management of soil. Resin extraction, an alternative method of characterizing soils, coupled with inductively coupled plasma (ICP) provides information about the relative activity of several elements simultaneously. Twenty-three sites of Barnes and Buse soils were sampled over a 170,000 km**2 region. In addition, adjacent Langhei or Svea soils were sampled at several sites. Soil cores were withdrawn to a depth of 60-cm but only the A or Ap horizons (8- to 15-cm depths) were subjected to resin extraction and extracts were analyzed by ICP. Data were statistically analyzed using SAS PROC GLM. Resin-extractable P and bicarbonate-extractable P concentrations were examined for correlation. Soils in this region have developed on glacial till and are characterized by substantial calcium carbonate in the subsoil and, in the cases of Buse and Langhei soils, in the A and Ap horizons. For the Barnes and Svea soils, elements commonly present as oxyanions were extracted on the anion exchange resin. However, for the Langhei and Buse soils, as much as 90% of the readily extractable oxyanions were found on the cation exchange resins. This was attributed to the very large amounts of resin-extractable Ca obtained (mean = 27.9 micromoles g**-1; single extraction with Soil-CEC:resin-CEC congruent to 10). Bicarbonate extractable P was weakly correlated to resin-extractable P, however, each soil showed a unique relationship. The results suggest that each soil should be managed as an individual and that banded applications of fertilizer P, S, and Mg may be more beneficial than broadcast additions.