Cecil soil

Hodges, S. C., and Johnson, G. (1987). Kinetics of sulfate adsorption and desorption by Cecil soil using miscible displacement. Soil Sci. Soc. Am. J. 51, 323-331. 

Blum, U., Worsham, A. D., King, L. D. and Gerig, T. M., 1994. Use of water and EDTA extractions to estimate available (free and reversibly bound) phenolic acids in Cecil soils. J. Chem. Ecol. 20, 341-359... 

Ability of ions for plant growth. Phosphate is probably more available in the Barnes soil, for example, than in the Cecil soil, although the total amounts of phosphate are similar. Soluble plus exchangeable aluminium reaches phytotoxic concentrations in the Cecil soil. The slight differences in total elemental composition of the two soils can encompass a wide range of secondary mineral compositions. 

One hundred days after the addition of 1,000 p.g/g (approximately 5 timol/g soil) ferulic acid to sterile Cecil soil samples, water, neutral EDTA, and water-autoclave extractions recovered 28% (277 tig/g), 37% (373 tig/g), and 32% (322 p.g/g) of the ferulic acid added, respectively, from Cecil A soil samples (3.7% organic matter) and 17% (167 tig/g), 52% (524 tig/g), and 30% (304 p.g/g) of the ferulic acid added, respectively, from Cecil B soil samples (0.2% organic matter Blum et al. 1992). The recovery of femlic acid from soil by neutral EDTA extraction was thus more effective than the water-autoclave extraction. 

Mean concentrations of available individual benzoic and cinnamic acid derivatives determined in this Cecil soil were small, less than 4 xg/g soil. The sums of 7 individual phenolic acids (0-2.5 cm soil cores) for wheat stubble tilled under/soybean and fallow/soybean soil samples were 58 and 38%, respectively, of wheat stub-ble/soybean soil samples (100% =12.30 0.58 tig/g). The sum of 7 individual phenolic acids for the 0-2.5 cm core samples was approximately 34% higher than for the 0-10 cm core samples. Plant tissues/residues contained greater individual phenolic acid content than soils. For example wheat stubble contained 258 times and wheat straw from half buried litter bags 65 times the p-coumaric acid of wheat no-till Cecil A soils (4 tig/g soil). 

Fig. 3.14 Mean total phenolic acid (femlic acid equivalents) content of 0-2.5 cm Cecil soil samples taken during the 1992 and 1993 growing season for reference plots (no-cover crop) and cover crop plots. In 1992 cover crops were desiccated with glyphosate in April. In 1993 cover crops were desiccated with glyphosate at two time periods (April and May) and living biomass was tilled into plots in May. The absence of standard error bars indicates that the error bars are too small to be visible. Figure based on data from Blum et al. (1997). Henry A Wallace Institute for Alternative Agriculture Inc, data used with permission of Cambridge University Press...

Fig. 3.18 Percent change of mominggloty, pigweed, and prickly sida seedlings in no-till Cecil soil field plots for two experimental periods [(a) 1996 and (b) 1997] with the following 4 treatments 1. cut wheat shoots on surface (s only), 2. wheat toots left in place but shoots cut and removed (r only), 3. wheat shoots and roots left in place, but shoots cut (s+r cut), and 4. wheat shoots and roots left in place, but shoots not cut (s+r not cut). Figures based on data from Hg. 3.17. Original data from Blum et al. (2002). Data used with permission of International Allelopathy Foundation...

Concentrations of individual, sum of 7 phenolic acids, and total phenolic acid content in Cecil soil appeared to be fairly constant over the experimental periods studied. For example, the maximum changes for the sum of 7 phenolic acids over the experimental periods were on the order of 20-30%. 

Hendrickson, B. H., Barnett, A. P., Carrker, J. R., Adams, W. E. (1963). Runoff and Erosion control studies on Cecil soils of the Southern Piedmont. USDA Technical Bulletin 1281. Johnson, H. B. (1976). Order upon the land. New York Oxford University Press. 

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