Studies on some characteristics of humic acid extracted from two organic residues mixed with calcareous soil and/or sand [electronic resource].

Includes references.

Physical, chemical and infrared analyses were conducted on humic acid extracted from three treatments namely; peanut residue, peanut residue + calcareous soil ( I : I ) and coffee residue + calcareous soil + sand ( I : I : 5 ) which gave - in a pervious study- the maximum percentage of tomato seedlings germination and dry weight. Data of physical properties reveal that bulk density and stability decreased with increasing the volume of organic residue. While, porosity and infiltration react increased. EC of coffee treatment ( I : I . 5) was lower than that of peanut treatments. pH shows slight variation C/N ratio for peanut treatments gave lower values compared to coffee treatment It is clear that infrared spectroscopy gives available information regarding the functionality of humic substances. In this respect, peanut treatment indicates higher density for all absorption bands as compared to other treatments.

Summary in Arabic.

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