The effect of the bacterial-feeding nematodes (Cephalobus sp.) grazing on IAA-producing bacteria (Pseudomonas sp. and Burkholderia sp.) stimulated both the microbial growth and activity and increased soil mineral nitrogen and IAA contents were investigated in pots
with soil under controlled conditions. The soil, nematodes and the property of IAA were analyzed at regular basis. In gnotobiotic microcosm conditions, the bacterial-feeding nematodes grazing on bacteria stimulated both the microbial growth and activity and increased the mineral nitrogen and
IAA content. The analysis of the IAA-producing bacteria (number, activity and IAA content) revealed a statistically significant in the presence of the bacterial-feeding nematodes. Our conclusion may be valid not only for experiments, but also for future application in agriculture.
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