By W S Wilson
The papers during this quantity supply a balanced account of advancements in soil natural topic examine. It specializes in composition and constitution, water caliber, natural topic turnover, humus caliber and fertility, and is key interpreting for all these desirous about the environmental facets of soil conservation and development
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Extra resources for Advances in Soil Organic Matter Research. The Impact on Agriculture and the Environment
34 15. 16. 17. 18. 19. 20. L. Wershaw, and P. ), Wiley and sons, New York, 1985, chapter 22, p. 561. C. A. Leenheer, D . M . McKnight, and K . A . S. Geological Survey Open-File Report 87-557, 1989. R . L . R. Aiken, D . M . L. Wershaw, and P. ), Wiley and Sons, New York, 1985, Chapter 7, p. 181. P. J. J. L. Malcolm, and E . M . Thurman, Geochim. et Cosmochim. Acta.. 1985,42,2091. R. Shulten, J. of Anal, and App. PvroL 1987,12, 149. N . R. Shulten, Environ. Sci. Technol. 1989,22, 1000. R. Shulten, R.
1 3 3 1 0 1 1 1 3 1 2 1 6 Recent CPMAS C - N M R spectra have also demonstrated that fulvic acids from all environments are not identical, contrary to some previously-held views. The C P M A S C - N M R spectra shown in Figure 2 and published e l s e w h e r e . . have established that fulvic acids from soils, streams, groundwaters, and seawaters are very different in chemical composition. CPMAS C - N M R spectra have been presented in the references to support the same conclusion for humic acids.
L Composition of the organic carbon contained in the particle size and density fractions of the (a) Millicent soil and (b) Urrbrae soil as determined by solid-state C NMR. 1 3 A concentration of aromatic carbon in the coarse clay and silt fractions was observed for both soils. Although the increase in aromatic carbon content was not large it is important since a large proportion of the total soil organic carbon in both soils was contained in these fractions. It should be pointed out that the portion of the total organic carbon analysed by solid-state C NMR using this technique was 74% and 77% for the Millicent and Urrbrae soils respectively.