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EFFECTS OF A HUMIC DEPOSIT (GYTTJA) ON SOIL CHEMICAL AND MICROBIOLOGICAL PROPERTIES AND HEAVY METAL AVAILABILITY

Ayten Karaca, Oguz Can Turgay and Nihal Tamer
http://dx.doi.org/10.1007/s00374-005-0056-3

ABSTRACT

 The influence of a humic deposit (Gytjja, G) alone (applied at 25 kg ha -1) and in combination with mineral fertilizer (G+NP) on soil organic matter content, pH, EC, total N content, calcium carbonate content, enzyme activities (urease, ß-glucosidase, arylsulphatase and alkaline phosphatase), microbial biomass C, soil respiration and availability of Cd, Pb, Ni, and Zn was examined through a 180 day incubation period and compared with the behavior of no treatment (control) and NP treatment. A significant increase in organic matter content was observed in the soils treated with G +NP. Compared with G and NP alone, the G +NP amended soils showed higher values of the selected microbiological properties. 

DTPA-extractable Cd, Pb, Ni, Cu, and Zn increased significantly with increasing rates of NP but, the addition of G+NP resulted in a considerable decrease in the amount of extractable metals during the incubation period (P<0.05). Based on these results, it could be concluded that the organic matter applied in the Gytjja led to an increase in the metal adsorption capacity of the amended soils. This material could be useful to reduce availability and mobility of heavy metals in the soils intensively amended with mineral fertilizers. A combination of G with NP could, therefore, be considered as an alternative approach in the applications of organo-mineral fertilization.

 

Key words :Gyttja- enzyme activity- biomass C- soil respiration- soil organic matter

 

 

 

 

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