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Effects of Thirty Years of Irrigation on the Genesis and Morphology of Two Semiarid Soils in Kansas

^a Dep. of Agronomy, Kansas State Univ., Manhattan, KS 66506
^b USDA-NRCS, Lincoln, Nebraska

View larger version (70K): [in a new window]   Fig. 1. Site locations and mean annual precipitation for Kansas. Figure modified from Goodin et al. (1995).

View larger version (13K): [in a new window]   Fig. 2. Sampling scheme used at the Richfield site location. The area inside the circle is irrigated by water pumped from a well located in the center of the field. In the inset diagram, the pivot track delineates the irrigated land from the dryland. The squares indicate pit locations and the circles represent pedons sampled using a Giddings probe.

View larger version (138K): [in a new window]   Fig. 3. Thin section micrographs. (A) Richfield dryland Bt2 (38–57 cm). Plasmic fabric is ma-skelsepic, or granostriated. This micrograph shows a biotite grain weathering, a process which releases 2:1 clays. (B) Richfield irrigated Bt2 (35–53 cm). Plasmic fabric is skel-masepic (or parallel striated), with a larger proportion of oriented clay in the matrix as well as coating skeleton grains. Cross-polarized light, long-axis frame length = 665 µm.

View larger version (15K): [in a new window]   Fig. 4. Total clay vs. depth for (A) Richfield dryland (S00KS055011) and irrigated (S00KS055016), and (B) Keith dryland (S00KS193001) and irrigated (S00KS193006).