The effect of selected plants on the formation of some communities of soil microorganisms with particular regard to ammonification bacteria
Wielgosz, E.(Akademia Rolnicza, Lublin (Poland). Katedra Mikrobiologii Rolniczej)
The experimental plots were established at the Experimental Station Felin in Lublin (Poland) in 1999. The following plants were cultivated: Vicia cassubica of Siberian origin, V. cassubica of Polish origin, and chickling vetch (Lathyrus sativus), Sida hermaphrodita and topinambur (Helianthus tuberosus). The control was the soil separated from the root system of the experimental plants. Microbiological analyses were carried out in autumn of 1999 and 2000. They determined the soil reaction (pH in KCl), total number of bacteria and filiform fungi, the number of nitrification and ammonification bacteria. Besides, morphological groups of ammonification bacteria and their activity were determined. The results indicate a higher total number of bacteria and fungi in the first year of studies as compared to the other one. S. hermaphrodita stimulated the growth of nitrification bacteria, while ammonification bacteria were stimulated both by S. hermaphrodita and by topinambur. As it turned out, the most numerous morphological group of bacteria occurring in the root sphere of particular plants was also the most active morphological group. In the soil under V. cassubica, bacilli were the dominating group, while under V. cassubica, chickling vetch and S. hermaphrodita, the dominating group were the rods. On the other hand, in the soil under topinambur and in the control soil, the greatest group was formed by ammonification Actinomycetes
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