Biological Strategies of Nutrient Cycling in Soil Systems

Effect of nitrogen fertilizer on nitrogen pools and soil communities under grazed pastures

“…This is higher than with other studies showing that fungi and fungal-feeding organisms are often reduced when soil N fertility and recycling increases (Coleman et al 1983;Bardgett et al 1999;De Vries et al 2006, 2007Lauber et al 2008;Krumins et al 2009). The mechanism is unknown but both are direct effects of fertilizer itself, and changes in the plant community and litter associated with fertilizers could be involved (Donnison et al 2000;Manning et al 2006).…”

Microbial-faunal interactions in the rhizosphere and effects on plant growth

“…However, it has been stressed by soil microbiologists that beneficial and deleterious rhizosphere bacteria may significantly affect plant growth [15,38,86,107,110]. Due to the dual effect of root exudates, fueling a diverse bacterial population and intensifying the competition for nutrients between plants and micro-organisms, the interaction between rhizosphere bacteria and plant roots can only be understood by considering microfaunal predators [27,30]. However, until now, exchange of thought and co-operation between the different disciplines investigating rhizosphere organisms is scarce.…”

Influence of repeated oxamyl application on nematode populations beneath 4 ryegrass cultivars on a yellow-brown loam

“…Some results indicate yield loss, others show no significant nematode effect (e.g., Corbett 1978). The increase of mineralisation of nutrients as a result of microbial grazing of bacterial feeding nematodes and predatory interactions is, so far, a feature of laboratory experiments (e.g., Coleman et al 1983). Full assessment of pathogenic and stimulatory effects of plant and soil nematodes is an ideal, and documentation of phenology of populations in further soils should continue.…”