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https://hdl.handle.net/2440/78947
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Type: | Journal article |
Title: | Growth and rhizosphere P pools of legume-wheat rotations at low P supply |
Author: | Mat Hassan, H. Hasbullah, Marschner, P. |
Citation: | Biology and Fertility of Soils, 2013; 49(1):41-49 |
Publisher: | Springer-Verlag |
Issue Date: | 2013 |
ISSN: | 0178-2762 1432-0789 |
Statement of Responsibility: | Hasnuri Mat Hassan & Hasbullah Hasbullah & Petra Marschner |
Abstract: | 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, white lupin and wheat were grown for 10 weeks in a loamy sand soil with low P availability. The following wheat was grown in the pre-crop soil with and without addition of pre-crop residues. Among the pre-crops, white lupin had the strongest effect on the P pools; it depleted the labile P pools, resin P and NaHCO3-Pi and also the less labile P pools, NaOH-Pi and residual P; whereas the concentration of NaHCO3-Po was higher than that in the rhizosphere of the other pre-crops. White lupin had a smaller biomass compared to faba bean which depleted the P pools to a lesser extent. Phosphorus uptake of the following wheat was greatest in white lupin pre-crop soil. Chickpea increased P uptake of the following wheat when residues were added. In the presence of residues, wheat after legumes depleted labile P pools to a greater extent than wheat after wheat, but this coincided with greater P uptake only in wheat after chickpea and white lupin, which may be explained by the small root biomass of wheat after faba bean. The results show that the greater P uptake of the following wheat induced by pre-crops may be due to two mechanisms: P mobilisation (white lupin) or P addition with legume residues (chickpea). This study further showed that P uptake by a crop is only partly a function of the depletion of P in the rhizosphere; another important factor is the ability to exploit a large soil volume. |
Keywords: | Crop rotation Grain legumes P fractionation P uptake Pre-crops Wheat |
Rights: | © Springer-Verlag 2012 |
DOI: | 10.1007/s00374-012-0695-0 |
Grant ID: | ARC |
Published version: | http://dx.doi.org/10.1007/s00374-012-0695-0 |
Appears in Collections: | Agriculture, Food and Wine publications Aurora harvest 4 |
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