Responses of sugarcane, maize, and soybean to phosphorus and vesicular-arbuscular mycorrhizal fungi

Kelly, R. M., Edwards, D. G., Thompson, J. P. and Magarey, R. C. (2001) Responses of sugarcane, maize, and soybean to phosphorus and vesicular-arbuscular mycorrhizal fungi. Australian Journal of Agricultural Research, 52 7: 731-743. doi:10.1071/AR00131

Author Kelly, R. M.
Edwards, D. G.
Thompson, J. P.
Magarey, R. C.
Title Responses of sugarcane, maize, and soybean to phosphorus and vesicular-arbuscular mycorrhizal fungi
Journal name Australian Journal of Agricultural Research   Check publisher's open access policy
ISSN 0004-9409
Publication date 2001-01-01
Sub-type Article (original research)
DOI 10.1071/AR00131
Open Access Status
Volume 52
Issue 7
Start page 731
End page 743
Total pages 13
Editor J. Fegent
S. Banerjee
Place of publication Collingwood, Vic
Publisher CSIRO
Language eng
Subject C1
300202 Plant Nutrition
620106 Sugar
Abstract The presence of vesicular-arbuscular mycorrhizal (VAM) fungi in long-term cane-growing fields associated with yield decline led to the supposition that VAM fungi may be responsible for the poor yields. A glasshouse trial was established to test the effectiveness of a species of VAM fungi, Glomus clarum, extracted from one of these North Queensland fields on the growth of sugarcane (Saccharum interspecific hybrid), maize (Zea mays), and soybean (Glycine max) for 6 phosphorus (P) rates (0, 2.7, 8.2, 25, 74, 222 mg/kg). For maize and soybean plants that received VAM (+ VAM), root colonisation was associated with enhanced P uptake, improved dry weight (DW) production, and higher index tissue-P concentrations than those without VAM (-VAM). By comparing DW responses of maize and soybean for different P rates, savings in fertiliser P of up to 160 and 213 kg/ha, respectively, were realised. Sugarcane plants were generally less responsive. Apart from a 30% DW increase with VAM when 2.7 mg P/kg was added, DW of +VAM plants was equivalent to, or worse than in the case of 222 mg P/kg, DW of -VAM plants. For all 3 host species, colonisation was least at the highest P application, presumably from excessive P within the plant tissue. Critical P concentrations for the 3 host species were below those reported elsewhere, and for soybean and sugarcane, the critical concentration for +VAM plants was lower than that of -VAM plants. There are 3 implications that arise from this study. First, VAM fungi present in cane-growing soils can promote the growth of maize and soybean, which are potential rotation crops, over a range of P levels. Second, the mycorrhizal strain taken from this site did not generally contribute to a yield decline in sugarcane plants. Third, application of P fertiliser is not necessary for sugarcane when acid-extractable P is <30 mg/kg if sufficient VAM propagules are present, or <47 mg/kg if a mycorrhizal response is not anticipated.
Keyword Agriculture, Multidisciplinary
Mycorrhizal Dependency
Yield Decline
Critical P Concentration
Q-Index Code C1

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Agriculture and Food Sciences
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Created: Wed, 15 Aug 2007, 01:51:47 EST