Growth,P uptake in grain legumes and changes in rhizosphere soil P pools |
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Authors: | Email author" target="_blank">Hasnuri?Mat HassanEmail author Petra?Marschner Ann?McNeill Caixian?Tang |
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Institution: | (1) Soils Group, School of Agriculture, Food and Wine, The Waite Research Institute, The University of Adelaide, Adelaide, SA, Australia;(2) Department of Agricultural Sciences, La Trobe University, Bundoora, Melbourne, VIC, Australia;(3) School of Biological Sciences, Universiti Sains Malaysia, Minden, Pulau Pinang, Malaysia |
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Abstract: | 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 this study was to compare the growth, P uptake and the changes in rhizosphere soil P pools in five grain
legumes in a soil with added P. Nodulated chickpea (Cicer arietinum L.), faba bean (Vicia faba L.), white lupin (Lupinus albus L.), yellow lupin (Lupinus luteus L.) and narrow-leafed lupin (Lupinus angustifolius L.) were grown in a loamy sand soil low in available P to which 80 mg P kg−1 was added and harvested at flowering and maturity. At maturity, growth and P uptake decreased in the following order: faba
bean > chickpea > narrow-leafed lupin > yellow lupin > white lupin. Compared to the unplanted soil, the depletion of labile
P pools (resin P and NaHCO3-P inorganic) was greatest in the rhizosphere of faba bean (54% and 39%). Of the less labile P pools, NaOH-P inorganic was
depleted in the rhizosphere of faba bean while NaOH-P organic and residual P were most strongly depleted in the rhizosphere
of white lupin. The results suggest that even in the presence of labile P, less labile P pools may be depleted in the rhizosphere
of some legumes. |
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