EFFECT OF DIFFERENT APPLICATIONS OF SOIL AMENDMENTS AND SLOW-RELEASE NITROGEN FERTILIZER ONSOIL ENZYMES AND MICROFLORA ACTIVITIES | ||||
| Journal of Soil Sciences and Agricultural Engineering | ||||
| Article 8, Volume 28, Issue 1, January 2003, Page 687-701 PDF (4 MB) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/jssae.2003.243981 | ||||
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| Authors | ||||
| A. A. Mohamed,1; S. A. M. EI-Sayed2 | ||||
| 1Agric. Botany Dept. Fac. Agric. in Assiut, AI-Azhar University | ||||
| 2Soil and Water Science Dept., Fac. Agric. in Assiut, AI-Azhar University | ||||
| Abstract | ||||
| Populations of microorganisms from soil treated with guanidine thiocyanate, guanylurea sulfate, thiourea, or furfural were compared with those of untreated soil. The materials affected quantitative and/or qualitative changes in composition of the soil microflora depending on the compound used. Guanidine thiocyanate (Gt) significantly increased total fungal populations relative to populations of other treatments. Populations of Penicillium purpurogenum were markedly higher in Gt- treated soil. Gt also increased total bacterial populations, and was the only compound that increased actinomycetes populations. The percentage of Trichoderma harzianum was significantly higher in soil treated with thiourea more than in the other treatments. Furfural increased the percentage of P. purpurogenum with respect to total fungi, and was as effective as guanylurea sulfate in increasing chitinolytic bacteria and those in the Pseudomonas cepacia-group. Thiourea most effectively promoted proliferation of coryneform bacteria. Chitinobyotic fungi increased synergistically when Gt and guanylurea sulfate were applied in combination. | ||||
| Keywords | ||||
| Slow - release nitrogen fertilizer compounds; total bacterial a nd fungal population; soil microflorea; soil enzymatic activities; furfural; biological control | ||||
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