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Subsoil rhizosphere modification by chickpea under a dry topsoil: implications for phosphorus acquisition
Journal article   Open access   Peer reviewed

Subsoil rhizosphere modification by chickpea under a dry topsoil: implications for phosphorus acquisition

M.E. Kabir, C. Johansen and R.W. Bell
Journal of Plant Nutrition and Soil Science, Vol.178(6), pp.904-913
2015
DOI: https://doi.org/10.1002/jpln.201500021
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Abstract

Chickpea (Cicer arietinum L.) roots exude carboxylates. While chickpea commonly grows where the topsoil dries out during crop growth, the importance of carboxylate exudation by the roots and mobilization of soil P from below the dry topsoil has not been examined. The study investigates the response of carboxylate exudation and soil P mobilization by this crop to subsoil P fertilizer rate. In constructed soil columns in the glasshouse, the P levels (high, low, and nil P) were varied in the well-watered subsoil (10-30 cm), while a low level of P in the dry topsoil (0-10 cm) was maintained. At flowering, rhizosphere carboxylates and rhizosphere soil from topsoil and subsoil roots were collected separately and analyzed. The concentration of total carboxylates per unit rhizosphere mass in the subsoil was nearly double that of the topsoil. Plants depleted sparingly soluble inorganic P (Pi), NaOH-Pi, and HCl-Pi, along with the labile Pi (water soluble and NaHCO3-Pi). The P depletion by plants was greater from the subsoil than the topsoil. The study concluded that depletion of sparingly soluble P from the chickpea rhizosphere in the subsoil was linked with the greater levels of carboxylates in the rhizosphere. These findings indicate that chickpea, with its deep rooting pattern, can increase its access to subsoil P when the topsoil dries out during crop growth by subsoil rhizosphere modification.

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Collaboration types
Domestic collaboration
International collaboration
Citation topics
3 Agriculture, Environment & Ecology
3.45 Soil Science
3.45.473 Soil Phosphorus Dynamics
Web Of Science research areas
Agronomy
Plant Sciences
Soil Science
ESI research areas
Agricultural Sciences
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