The effect of pH on morphological and physiological root traits of Lupinus angustifolius treated with struvite as a recycled phosphorus source

Ana A. Robles-Aguilar, Jiayin Pang, Johannes A. Postma, Silvia D. Schrey, Hans Lambers, Nicolai D. Jablonowski

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

AimsPhosphorus (P) recovery from specific waste streams is necessary to develop environmentally sustainable and efficient fertilizers, achieving maximum productivity with minimum losses. A promising example of a P-recovery product is struvite (MgNH(4)PO(4)6H(2)O). Phosphorus availability from struvite is profoundly influenced by soil pH and/or processes in the rhizosphere. Root exudates (e.g., organic anions) and root morphology affect fertilizer bioavailability. The overall objective of our study was to identify root morphological and physiological traits of the narrow-leaf lupine (Lupinus angustifolius L. subsp. angustifolius, cultivar: blau Boregine) involved in the acquisition of P from struvite, compared with KH2PO4 as a soluble P source. The study included different pH conditions, as soil pH is one of the main factors affecting P availability.MethodsNarrow-leaf lupine plants were grown in river sand under three pH conditions (4.5, 6.5 and 7.5). Three different P treatment conditions were used: 1) KH2PO4 (KP); 2) MgNH(4)PO(4)6H(2)O (Struvite), both supplied at 15g P g(-1) dry sand; and 3) no P addition (Nil-P), as control. Organic acids in the rhizosheath were collected. Root morphological parameters such as specific root length and root diameter were analyzed.ResultsThere was no significant difference in total plant biomass detected under any pH condition between struvite and KP treatments. In both acidic and alkaline conditions, the P-uptake efficiency (PUE: mg P plant(-1)/cm(2) root surface area) with struvite was significantly greater than with KP. At neutral pH, there was no difference in PUE between plants supplied with KP or struvite. Plants growing at neutral pH showed greater root exudation of carboxylates (mainly citrate) when struvite was added compared with KP. At alkaline pH, the exudation per unit root surface area was greater than that at acidic or neutral pH. Plants growing in acidic pH had a higher specific root length (SRL) compared with those grown at alkaline or neutral pH.ConclusionsSimilar P-uptake efficiency from struvite and KH2PO4 at neutral pH in conjunction with the higher total biomass compared to the Nil-P treatment (70% higher) suggests very effective mobilization of P from struvite by carboxylate exudation. Application of struvite, while taking into account the different strategies for nutrient mobilization, can increase the use efficiency of this recovered P source.

Original languageEnglish
Pages (from-to)65-78
Number of pages14
JournalPlant and Soil
Volume434
Issue number1-2
DOIs
Publication statusPublished - Jan 2019

Cite this

Robles-Aguilar, Ana A. ; Pang, Jiayin ; Postma, Johannes A. ; Schrey, Silvia D. ; Lambers, Hans ; Jablonowski, Nicolai D. / The effect of pH on morphological and physiological root traits of Lupinus angustifolius treated with struvite as a recycled phosphorus source. In: Plant and Soil. 2019 ; Vol. 434, No. 1-2. pp. 65-78.
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title = "The effect of pH on morphological and physiological root traits of Lupinus angustifolius treated with struvite as a recycled phosphorus source",
abstract = "AimsPhosphorus (P) recovery from specific waste streams is necessary to develop environmentally sustainable and efficient fertilizers, achieving maximum productivity with minimum losses. A promising example of a P-recovery product is struvite (MgNH(4)PO(4)6H(2)O). Phosphorus availability from struvite is profoundly influenced by soil pH and/or processes in the rhizosphere. Root exudates (e.g., organic anions) and root morphology affect fertilizer bioavailability. The overall objective of our study was to identify root morphological and physiological traits of the narrow-leaf lupine (Lupinus angustifolius L. subsp. angustifolius, cultivar: blau Boregine) involved in the acquisition of P from struvite, compared with KH2PO4 as a soluble P source. The study included different pH conditions, as soil pH is one of the main factors affecting P availability.MethodsNarrow-leaf lupine plants were grown in river sand under three pH conditions (4.5, 6.5 and 7.5). Three different P treatment conditions were used: 1) KH2PO4 (KP); 2) MgNH(4)PO(4)6H(2)O (Struvite), both supplied at 15g P g(-1) dry sand; and 3) no P addition (Nil-P), as control. Organic acids in the rhizosheath were collected. Root morphological parameters such as specific root length and root diameter were analyzed.ResultsThere was no significant difference in total plant biomass detected under any pH condition between struvite and KP treatments. In both acidic and alkaline conditions, the P-uptake efficiency (PUE: mg P plant(-1)/cm(2) root surface area) with struvite was significantly greater than with KP. At neutral pH, there was no difference in PUE between plants supplied with KP or struvite. Plants growing at neutral pH showed greater root exudation of carboxylates (mainly citrate) when struvite was added compared with KP. At alkaline pH, the exudation per unit root surface area was greater than that at acidic or neutral pH. Plants growing in acidic pH had a higher specific root length (SRL) compared with those grown at alkaline or neutral pH.ConclusionsSimilar P-uptake efficiency from struvite and KH2PO4 at neutral pH in conjunction with the higher total biomass compared to the Nil-P treatment (70{\%} higher) suggests very effective mobilization of P from struvite by carboxylate exudation. Application of struvite, while taking into account the different strategies for nutrient mobilization, can increase the use efficiency of this recovered P source.",
keywords = "Carboxylate exudation, Fertilizer-use efficiency, Struvite, Recycled phosphorus, Rhizosphere pH, Root diameter, Specific root length, SOIL-PHOSPHORUS, USE EFFICIENCY, PLANT, PHOSPHATE, GROWTH, RHIZOSPHERE, ACQUISITION, RESPONSES, WHEAT, SENSITIVITY",
author = "Robles-Aguilar, {Ana A.} and Jiayin Pang and Postma, {Johannes A.} and Schrey, {Silvia D.} and Hans Lambers and Jablonowski, {Nicolai D.}",
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The effect of pH on morphological and physiological root traits of Lupinus angustifolius treated with struvite as a recycled phosphorus source. / Robles-Aguilar, Ana A.; Pang, Jiayin; Postma, Johannes A.; Schrey, Silvia D.; Lambers, Hans; Jablonowski, Nicolai D.

In: Plant and Soil, Vol. 434, No. 1-2, 01.2019, p. 65-78.

Research output: Contribution to journalArticle

TY - JOUR

T1 - The effect of pH on morphological and physiological root traits of Lupinus angustifolius treated with struvite as a recycled phosphorus source

AU - Robles-Aguilar, Ana A.

AU - Pang, Jiayin

AU - Postma, Johannes A.

AU - Schrey, Silvia D.

AU - Lambers, Hans

AU - Jablonowski, Nicolai D.

PY - 2019/1

Y1 - 2019/1

N2 - AimsPhosphorus (P) recovery from specific waste streams is necessary to develop environmentally sustainable and efficient fertilizers, achieving maximum productivity with minimum losses. A promising example of a P-recovery product is struvite (MgNH(4)PO(4)6H(2)O). Phosphorus availability from struvite is profoundly influenced by soil pH and/or processes in the rhizosphere. Root exudates (e.g., organic anions) and root morphology affect fertilizer bioavailability. The overall objective of our study was to identify root morphological and physiological traits of the narrow-leaf lupine (Lupinus angustifolius L. subsp. angustifolius, cultivar: blau Boregine) involved in the acquisition of P from struvite, compared with KH2PO4 as a soluble P source. The study included different pH conditions, as soil pH is one of the main factors affecting P availability.MethodsNarrow-leaf lupine plants were grown in river sand under three pH conditions (4.5, 6.5 and 7.5). Three different P treatment conditions were used: 1) KH2PO4 (KP); 2) MgNH(4)PO(4)6H(2)O (Struvite), both supplied at 15g P g(-1) dry sand; and 3) no P addition (Nil-P), as control. Organic acids in the rhizosheath were collected. Root morphological parameters such as specific root length and root diameter were analyzed.ResultsThere was no significant difference in total plant biomass detected under any pH condition between struvite and KP treatments. In both acidic and alkaline conditions, the P-uptake efficiency (PUE: mg P plant(-1)/cm(2) root surface area) with struvite was significantly greater than with KP. At neutral pH, there was no difference in PUE between plants supplied with KP or struvite. Plants growing at neutral pH showed greater root exudation of carboxylates (mainly citrate) when struvite was added compared with KP. At alkaline pH, the exudation per unit root surface area was greater than that at acidic or neutral pH. Plants growing in acidic pH had a higher specific root length (SRL) compared with those grown at alkaline or neutral pH.ConclusionsSimilar P-uptake efficiency from struvite and KH2PO4 at neutral pH in conjunction with the higher total biomass compared to the Nil-P treatment (70% higher) suggests very effective mobilization of P from struvite by carboxylate exudation. Application of struvite, while taking into account the different strategies for nutrient mobilization, can increase the use efficiency of this recovered P source.

AB - AimsPhosphorus (P) recovery from specific waste streams is necessary to develop environmentally sustainable and efficient fertilizers, achieving maximum productivity with minimum losses. A promising example of a P-recovery product is struvite (MgNH(4)PO(4)6H(2)O). Phosphorus availability from struvite is profoundly influenced by soil pH and/or processes in the rhizosphere. Root exudates (e.g., organic anions) and root morphology affect fertilizer bioavailability. The overall objective of our study was to identify root morphological and physiological traits of the narrow-leaf lupine (Lupinus angustifolius L. subsp. angustifolius, cultivar: blau Boregine) involved in the acquisition of P from struvite, compared with KH2PO4 as a soluble P source. The study included different pH conditions, as soil pH is one of the main factors affecting P availability.MethodsNarrow-leaf lupine plants were grown in river sand under three pH conditions (4.5, 6.5 and 7.5). Three different P treatment conditions were used: 1) KH2PO4 (KP); 2) MgNH(4)PO(4)6H(2)O (Struvite), both supplied at 15g P g(-1) dry sand; and 3) no P addition (Nil-P), as control. Organic acids in the rhizosheath were collected. Root morphological parameters such as specific root length and root diameter were analyzed.ResultsThere was no significant difference in total plant biomass detected under any pH condition between struvite and KP treatments. In both acidic and alkaline conditions, the P-uptake efficiency (PUE: mg P plant(-1)/cm(2) root surface area) with struvite was significantly greater than with KP. At neutral pH, there was no difference in PUE between plants supplied with KP or struvite. Plants growing at neutral pH showed greater root exudation of carboxylates (mainly citrate) when struvite was added compared with KP. At alkaline pH, the exudation per unit root surface area was greater than that at acidic or neutral pH. Plants growing in acidic pH had a higher specific root length (SRL) compared with those grown at alkaline or neutral pH.ConclusionsSimilar P-uptake efficiency from struvite and KH2PO4 at neutral pH in conjunction with the higher total biomass compared to the Nil-P treatment (70% higher) suggests very effective mobilization of P from struvite by carboxylate exudation. Application of struvite, while taking into account the different strategies for nutrient mobilization, can increase the use efficiency of this recovered P source.

KW - Carboxylate exudation

KW - Fertilizer-use efficiency

KW - Struvite

KW - Recycled phosphorus

KW - Rhizosphere pH

KW - Root diameter

KW - Specific root length

KW - SOIL-PHOSPHORUS

KW - USE EFFICIENCY

KW - PLANT

KW - PHOSPHATE

KW - GROWTH

KW - RHIZOSPHERE

KW - ACQUISITION

KW - RESPONSES

KW - WHEAT

KW - SENSITIVITY

U2 - 10.1007/s11104-018-3787-2

DO - 10.1007/s11104-018-3787-2

M3 - Article

VL - 434

SP - 65

EP - 78

JO - Plant and Soil: An International Journal on Plant-Soil Relationships

JF - Plant and Soil: An International Journal on Plant-Soil Relationships

SN - 0032-079X

IS - 1-2

ER -