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- W1991433350 abstract "The qualitative and quantitative distribution of N-compounds in 10 tropical soils, and in a number of humic materials extracted from representative samples thereof, was determined after 6 N HCl hydrolysis. Eighty to 98% of the total N in the soils and humic materials was hydrolysable by 6 n HCl. Slightly less than one half the hydrolysable N in the soils and humic fractions consisted of amino acids. Well-drained soils and fulvic acids extracted from them contained unusually high concentrations of the acidic amino acids, aspartic and glutamic acids. Between 80 and 95% of the amino acids in the soils was accounted for in the humic materials + NaOH-insoluble organic residues. NH + 4 -N released by acid hydrolysis was generally higher for the soil samples than for the humic materials. Amino sugar-N constituted relatively small proportions of the total N in the soils and humic fractions. Our data suggest that large quantities of amorphous allophanic materials coupled with relatively high enzymic activity are responsible for the observed accumulation of acidic amino acids in the well-drained tropical volcanic soils." @default.
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- W1991433350 date "1976-01-01" @default.
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- W1991433350 title "The distribution of nitrogen in some highly organic tropical volcanic soils" @default.
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- W1991433350 doi "https://doi.org/10.1016/0038-0717(76)90022-5" @default.
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