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Content and composition of humus of the principal soils of north vietnam part 2 dark red ferralitic and ferralitic margalitic soils



Content and composition of humus of the principal soils of north vietnam part 2 dark red ferralitic and ferralitic margalitic soils



Biologicheskie Nauki (Moscow) 17(10): 129-134



In the dark red ferralitic soils humus content was 3.45-3.84%, N content was 0.14-0.18% and the C:N ratio was 12.3-14.3. These same indices in the ferralitic-margalitic sils were 3.03-5.74%, 0.14-0.24% and 12.5-13.9, respectively. The Chumic acid:Cfulvic acid ratio was 0.25-0.58 in the humus of the dark red ferralitic soils; humic acids were evenly distributed along the profile. Cultivation of coffee plants (for 27 yr) shifted the humification process towards the humate type. The character of the humus in these soils was fulvate. A humate type of humus formation was characteristic of the ferralitic-margalitic soils (Chumic acid:Cfulvic acid = 1.63-1.95) and the content of humic acids bound with Ca was significant. The humic acids in these soils were similar in nature to the humic acids of the chernozem-like tropical soils of Cuba, Guinea and India.

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