Legume residue influence arbuscular mycorrhizal colonisation and P uptake by wheat |
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| Authors: | Hasbullah Petra Marschner Ann McNeill |
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| Institution: | (1) School of Agriculture, Food and Wine, The University of Adelaide, Adelaide, Australia; |
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| Abstract: | Legumes have been shown to increase growth and P uptake of the following cereal. This could, in part, be due to nutrients
released by the decomposing legume residues. To investigate the effect of P added with legume residues on wheat growth, P
uptake and arbuscular mycorrhizal (AM) colonisation, a number of experiments were conducted with different legume residues
added to a soil with low P availability under conditions in which N was not limiting. Young and mature faba bean shoots (FYS,
FMS) and mature chickpea shoots (CP) were added to soil at different rates (0.5–2%, w/w) with the P concentration being the greatest in the young faba bean shoots and least in the mature chickpea residues. Other
treatments included addition of inorganic P at different rates (0–80 mg P kg−1). Available P, growth and P uptake and AM colonisation of wheat were measured after 6 weeks. As expected, inorganic P addition
increased growth and P uptake but decreased AM colonisation. The effect of the residues was more complex. AM colonisation
was not correlated with available P in the soil amended with residues, whereas there was significant negative correlation
between available P and AM colonisation in the treatments with inorganic P. Addition of FYS increased wheat shoot growth and
P uptake and decreased AM colonisation. However, FMS and CP addition not only decreased wheat growth and P uptake but also
AM colonisation despite low soil P availability. It is concluded that addition of some legume residues can improve the growth
of subsequent cereals, but others have a negative effect on wheat growth and AM colonisation which cannot be explained solely
by soil P availability. |
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