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soil microbial activity

Catalogue: GRDC Final Reports
The main objective of this project was to develop improved prediction and better management options for controlling Rhizoctonia disease through identification of critical regulating factors influencing R. solani , microbial activity and host plants... It should be noted that multiple summer rainfall events reduce the Rhizoctonia pathogen inoculum levels from high to lower disease risk, whereas prolonged dry periods can even cause an increase in inoculum levels... Results from multiple sites in SA and NSW indicated that inoculum levels were generally reduced after non-cereal rotation crops including peas, medic pasture and fallowing compared to cereal crops...
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Catalogue: Ground Cover
Mallee grower Allen Buckley has lifted the health of soils on his Waikerie, South Australia, farm... Growers: Allen and Jenny Buckley Location: Waikerie, South Australia Area: 5000 hectares Crops: wheat, cover crops Livestock: 1000 Merino ewes, half joined to Merino rams and half to cross-bred rams Soils: predominantly sandy Average annual rainfall: 250 millimetres (160mm growing season).. Allen is also experimenting with cover crops - another unusual sight in the Mallee - after seeing the results of CSIRO and South Australian Research and Development Institute trials on his farm and visiting growers in the US who sow a mixed cover crop rather than a monoculture...
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Catalogue: GRDC Updates
Soil organisms (sometimes referred to as the soil biota) carry out a diverse range of processes that are important for the maintenance of soil fertility and soil health, and directly impact on the sustainability of a cropping system... Recent work on sugarcane in Australia has shown that soil amended with sugarcane residue remained suppressive to root-lesion nematode for at least 47 weeks (Stirling et al. 2005), and that when this material was mulched on the soil surface, the soil immediately beneath the mulch was highly suppressive to the nematode (Stirling et al ... Early results suggest that biological mechanisms of suppression to root-lesion nematodes are operating in many of these soils...
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Catalogue: GRDC Final Reports
If opening rains arrive early in the season, it may be advisable to sow the crop seven to 10 days after these rains - as results show that microbial activity remains high at this time, helping in suppression of the disease... Results of our experiments conducted during this project will help in understanding the behaviour of R. solani AG-8 under different soil environments and its interaction with rate of root growth and microbial activity in the development of disease... Our results will also help in the prediction of disease in a season on basis of timing and amount of opening rains...
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