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. 2022 Jun 8;56(13):9196–9219. doi: 10.1021/acs.est.2c00099

Table 3A. Summary of Known Plant to Mobilize Soil P.

plant family/species
 location and soil P concn (mg kg–1)
   % total carboxylates
 soil mobilized Pa (mg kg–1)
          
Fabaceae location Pt bicarb.-extr.b P total carboxylates (μmol g–1 root dw)c malonic malic citric malonic malic citric ref        
chickpea (Cicerarietinum) Mullewa 83–97 17–19 40–65 70–79 7–20 8–12 1.6d 1.25d 2.0d Wouterlood et al.91        
Merredin 82–108 11–24 100–310 63–82 10–19 7–22        
Esperance 133–275 24–54 17–120 61–84 8–23 3–18        
Cicer arietinum Heera Northam 158 5 30–70 50–91 30–41 trace 0.4 0.75 0.1        
Tyson Nyabing 66 4 90–99 20–42 1.6 1.9 1.2        
white lupin (Lupinusalbus) Bindoon – – 237 – 88.5 11.5 – – – Veneklaas et al.35        
Merredin 213 12 88        
Pingrup 282 41.9 58.1        
Mingenew 180 85.9 14.1        
Nyabing 109 66.7 33.3        
Scadden 92.8 29.4 70.6        
   
 organic acid species and % total carboxylates
 pH
            
plant species total carboxylates concn (μmol g–1 root dw) malic citric malonic initial pH 6.7 ref          
  3 μM P 300 μM P 3 μM P 300 μM P 3 μM P 300 μM P 3 μM P 300 μM P 3 μM P 300 μM P Pearse et al.173          
Triticum aestivum 5.00 3.33 90 93 10 6.31     4.04 4.09          
Brassica napus 3.33 8.00 95.4 98.7 2.8 –     4.35 4.70          
Vicia faba 6.66 5.00 62.8 68.4 38.5 32.3     6.52 6.78          
Lens culinaris 5.00 5.16 – – 12.3 55.4 87.7 44.3 6.44 6.57          
Cicer arietinum 55.0 30.0 3.1 4.8 40 27.8 56.9 65.8 6.26 6.09          
Pisum sativum 25.0 9.3 4.8 34.9 95.4 63.1     6.26 6.37          
Lupinus luteus 51.6 18.0 10.8 13.8 90.7 87.7     4.70 5.17          
L. albus 49.1 20.0 38.8 44.8 58.6 55.7     5.22 5.39          
L. atlanticus 31.7 9.0 20.3 36.0 78.6 63.4     5.57 6.04          
L. angustifolius 28.3 14.2 28.5 36.9 72.7 67.1     5.57 5.70          
L. mutabilis 23.3 11.7 30.5 44.6 70.4 56.3     5.83 5.78          
L. pilosus 19.7 15.0 12.3 15.1 89.2 85.5   0.5 4.26 4.70          
L. cosentinii 16.7 14.7 12.3 13.8 88.4 86.3     5.22 5.39          
   
  
 cultivars and % total organic acids
  
plant species location and soil P concn (mg kg–1)
 total organic acids (μmol g–1 root dw)
 Sona
 Kaniva
 Tyson
  
Fabaceae location Pt bicarb.-extr.b P Sona Kaniva Tyson malonic malic citric malonic malic citric malonic malic citric ref
chickpea (Cicerarietinum) Bindoon 193 11.3 110 200 191 83 1 7 86.4 4.5 9.1 81 4.8 14.3 Veneklaas et al.35
Merredin 57 6.0 11 36.4 45.5 54 <1 39 75 – 25 60 – 40
Pingrup 67 6.3 59 127 138 76 <1 22 64.3 7.1 28.6 67.1 4.6 28.3
Mingenew 116 9.0 37 168 228 67 2 28 97.3 – 2.7 84 12 4
Northam 113 6.0 120 – – 63 – 37 –
Nyabing 40 4.3 100 144 167 80 – 20 87.3 6.3 6.3 87 6.5 6.5
Hyden 43 2.7 15 – – 82 – 17 –
Scadden 18 5.3 122 133 150 81 4 15 65.8 4.8 29.5 63.6   36.4
Mullewa 94 8.7 162 – – 80 3 17 –
Morowa 91 10.3 52 – – 78 3 19 –
Proteaceae organic acid species concn (mg L–1in 100 mL soil leachates % total organic acids ref                        
Banksia integrifolia citric 12.6 50 Grierson174                        
  maleic 2.88 11                        
  malic 4.58 18                        
  aconitic 4.34 17                        
  fumaric 1 4                        
a

The P-mobilizing capacity of carboxylates on soils was analyzed by extracting 3 g soil with 30 mL of 0.5 mM citrate, malate, or malonate.

b

bicarb.-extr. = bicarbonate-extractable; extr. = extractable. Bicarbonate-extractable P is extracted with 0.5 M sodium bicarbonate at pH 8.5.89

c

Carboxylates in the rhizosphere were extracted with 0.2 mM CaCl2.91,123

d

Mobilized P was extracted from a soil with total and bicarbonate-extractable P at 66 and 4 mg kg–1.91