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KMID : 0903519680090010153
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Journal of the Korean Society of Agricultural Chemistry and Biotechnology
1968 Volume.9 No. 1 p.153 ~ p.159
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Studies on the humus soil reclaimed by farming for cultivation
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Abstract
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In this paper the auther investigated the chemical properties, process of humification and type of humic acid in soils which were reclaimed by farming for cultivation in Kangwondo.
The results obtained in this studies were summarized as follows:
1. General chemical components of these soil were similar to the ordinary soil but C.E.C. and humus contents were found much more
2. Humic acid and fulvic acid which were extracted with NaOH from soil were greater than those of Na-pyrophosphate(Na-p.) and NaF. Hmus contents and PQ% were increased much more in the upper layer than in the lower layer.
3. Degree of humification of humic acid extracted with NaOH. was very similar to those extracted with Na-pyrophosphate.
Humification degree of humic acid extracted with NaF was lower than humic acid which were extracted with NaOH and Na-pyrophosphate. But humification degree of humic acid extracted with NaOH was similar to that with Na-pyrophosphate. Humic acid in B soil and the upper layer was higher than A, C soil and the lower layer of soil, in humification degree.
4. Humic acids extracted with NaOH and Na-pyrophosphate from soil were fractionated by Mg into two parts α and β type extracted with NaOH were higher than these of Na-pyrophosphate in humification degree.
In this soil the humification degree of humic acid was not changed during the period of cultivation.
5. α, β type humic acid extracted with NaOH were very similar to the humic acid extracted with Na-pyrophosphate in shapes of absorption curves.
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