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In soils with low P availability, several legumes have been shown to mobilise less labile P pools and a greater capacity to take up P than cereals. But there is little information about the size of various soil P pools in the rhizosphere of legumes in soil fertilised with P although P fertiliser is often added to legumes to improve N2 fixation. The aim of(More)
Little is known about the decomposition rates of shoot and root residues of perennial grasses. This knowledge is important to estimate the carbon sequestration potential of the grasses. An incubation experiment was carried out in a sandy clay loam with shoot and root residues of three native perennial grasses (Wallaby grass, Stipa sp. and Kangaroo grass)(More)
Legume pre-crops may increase P uptake of the following wheat, but the mechanisms behind this effect are unclear. A rotation study was carried out to assess the concentrations of rhizosphere P pools of three grain legumes and wheat (phase 1) and their effects on P uptake and P pools in the rhizosphere of the following wheat (phase 2). Faba bean, chickpea,(More)
Legumes have been shown to increase P uptake of the following cereal, but the underlying mechanisms are unclear. The aim of this study was to compare the effect of legume pre-crops and their residues on the growth, P uptake and size of soil P pools in the rhizosphere of the following wheat. Three grain legumes (faba bean, chickpea and white lupin) were(More)
Phosphorus (P) deficiency is wide-spread in agricultural soils. In light of increasing P fertilizer costs, it is of interest to assess the capacity of soil microbes to mobilise native soil P and added P. There is currently no method to assess P mobilisation in situ. The soil P mobilisation potential was assessed by incubating low P soil for up to 30 days(More)
Research Projects consult the staff member(s) whose interests are closest to your own or, if you are unsure, consult the Honours Coordinator. General Information about a B.Sc. (Hons) degree B.Sc (Honours) in the School of Earth and Environmental Sciences at the University of Adelaide is the gateway to increased job opportunities and to a great range of(More)
In saline soils under semi-arid climate, low matric and osmotic potential are the main stressors for microbes. But little is known about the impact of water potential (sum of matric and osmotic potential) and substrate composition on microbial activity and biomass in field collected saline soils. Three sandy loam soils with electrical conductivity of the(More)
Phosphorus and nitrogen availability and forms are affected by soil properties as well as by plant species and further modulated by soil microbes. Additionally, close contact of the roots of two plant species may affect concentrations and forms of N and P. The aim of this study was to assess properties related to N and P cycling in the rhizosphere of wheat(More)
It is well known that nutrient availability and microbial biomass and activity in the soil following plant residue addition are influenced by residue composition. But, less is known about the effect of repeated addition of residue with different decomposability on these soil properties and how they are affected by the order in which the residues are added.(More)
Phosphorus utilization efficiency is very low in soil due to its low solubility and mobility. Legumes have been shown to increase P uptake of the following wheat, but the underlying mechanisms of this effect are unclear. Using three soils with low P availability differing in pH and therefore predominant P form: Mount Bold (pH 4.8), Monarto (pH 7.5) and(More)