Premium
Effects of industrial liquid wastes on dinitrogen fixation and microflora of soils and waters
Author(s) -
Fayez M.,
Shahin R. R.
Publication year - 1987
Publication title -
zeitschrift für pflanzenernährung und bodenkunde
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.644
H-Index - 87
eISSN - 1522-2624
pISSN - 0044-3263
DOI - 10.1002/jpln.19871500406
Subject(s) - clostridia , soil water , salinity , environmental chemistry , heavy metals , environmental science , chemistry , bacteria , toxicology , biology , ecology , soil science , genetics
Potential N 2 ‐fixation was investigated in a number of samples representing soils and water courses under the effect of some industrial wastes in Helwan area of Egypt. Microbiological analysis of soil and water samples showed the general enrichment of fungi, actinomycetes and bacteria including N 2 ‐fixers. Among asymbiotic N 2 ‐fixers, azospirilla compared to azotobacters and clostridia were found to be present with rather higher densities in all samples tested. Generally, the microbial numbers increased by increasing the distance from the Industrial Complex at Helwan, which could be attributed to the high levels of salinity and total heavy metals near the factories. The results indicated that the industrial wastes near the factories exerted inhibitory effects on the acetylenereducing activity in soils, which seriously reduces their biological fertility. Such effects were decreased by getting away from the factories. Significantly negative correlations were recorded between densities of N 2 ‐fixers or N 2 ‐ase activity and salinity and total heavy metals content in both soil and water samples.