Phosphate sorption by Egyptian, Ethiopian and German soils and P uptake by rye (<i>Secale cereale</i> L.) seedlings

Soltan, S.; Römer, Wilhelm; Adgo, Enyew; Gerke, Jörg; Schilling, G.

doi:10.1002/jpln.19931560608

Cited by 12 publications

(6 citation statements)

References 10 publications

(8 reference statements)

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“…In summary, the continuous slow reaction between soil and P ( Barrow , 1987) decreases the P solubility in soil, which, with increasing time of reaction, increases the P buffering and eventually causes the fixation of P at the soil solid phase. In the fixation process, Ca‐P precipitation seems to play a minor role in the removal of P from solution even in calcareous soils ( Ryan et al, 1985; Solis and Torrent , 1989; Soltan et al, 1993; Zhang et al, 2005; Deveau et al, 2009).…”

Section: Soil P Forms and P Availabilitymentioning

confidence: 99%

The acquisition of phosphate by higher plants: Effect of carboxylate release by the roots. A critical review.

Gerke¹

2015

J. Plant Nutr. Soil Sci.

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147

124

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Phosphorus is one of the most limiting macronutrients for plant productivity in agriculture worldwide. The main reasons are the limited rock phosphate reserves and the high affinity of phosphate (P) to the soil solid phase, restricting the P availability to the plant roots. Plants can adapt to soils low in available P by changing morphological or/and physiological root features. Morphological changes include the formation of longer root hairs and a higher root : shoot ratio both parameters increasing the root surface which provides the shoot with P. This may be successful if the P availability in soil, i.e., the P concentration of the soil solution is not extremely low (> 1-2 μM P). If the P concentration of the soil solution is lower, the diffusive flux to the root surface will be very low and may not satisfy the P demand of the shoots. Under these conditions plants have developed strategies to increase the rhizosphere soil solution concentration by secreting mobilizing agents. The most effective way of P mobilization is the release of di-and tricarboxylic acid anions, especially oxalate and citrate. Citrate can accumulate in the rhizosphere up to concentrations up to 80 μmol g -1 soil. Cluster root formation is an efficient way of carboxylate accumulation in the cluster root rhizosphere improving P mobilization. Cluster roots strongly improve the acquisition of the mobilized P. Considering a single root, around 80-90% of the mobilized P diffuses away from the root. From the rhizosphere of cluster roots, most of the mobilized P is taken up by the cluster roots. Both, the strong accumulation of carboxylates in and the effective P uptake from the cluster-root rhizosphere are the basis of the unique ability of P acquisition by cluster root-forming plants. Plants that do not form cluster roots, e.g., red clover, can also accumulate carboxylates in the rhizosphere. Red clover accumulates high quantities of citrate in the rhizosphere soil. Model calculations show that the release of citrate by red clover roots and its accumulation in the rhizosphere strongly improve P acquisition by this plant species in various soils. Similar results are obtained with alfalfa. In sugar beet, oxalate release can strongly contribute to P acquisition. In summary, P acquisition can be strongly improved by the release of carboxylates and should be taken as a challenge for basic and applied research.

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Section: Soil P Forms and P Availabilitymentioning

confidence: 99%

The acquisition of phosphate by higher plants: Effect of carboxylate release by the roots. A critical review.

Gerke¹

2015

J. Plant Nutr. Soil Sci.

Self Cite

147

124

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“…Moreover, a large fraction of total soil P is in organic form in many soils and these forms are not directly available to plants (Smith, 2001;Vance et al, 2003). Many of the agricultural soils in the developing countries in particular are P-deficient (Velk and Koch, 1992) and have an unfavourable condition for P availability (Soltan et al, 1993). It is estimated that crop productivity is limited by P deficiency on more than 40% of the world arable lands (Vance, 2001).…”

Section: Soil Phosphorus Status and Its Availabilitymentioning

confidence: 99%

Management of soil phosphorus and plant adaptation mechanisms to phosphorus stress for sustainable crop production: a review

Balemi

Negisho

2012

J. Soil Sci. Plant Nutr.

212

145

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Phosphorus is one of the seventeen essential nutrients required for plant growth. Despite its importance, it is limiting crop yield on more than 40% of the world's arable land. Moreover, global P reserves are being depleted at a higher rate and according to some estimates there will be no soil P reserve by the year 2050.This is a potential threat to sustainable crop production. Most of the P applied in the form of fertilizers may be adsorbed by the soil, and is not available for plants lacking specific adaptations. Available soil P and hence crop yield can, however, be increased through applying P containing fertilizers to feed the ever increasing world population. The P contained in crop residues if left in the field can be recycled by incorporating the residues into the soil whereas part of P in crop residues fed to livestock can be returned back to the soil in the form of manure and as bone meal. Additionally, plants have evolved a diverse array of strategies to obtain adequate P for their growth under P limiting conditions (a term called as P-efficiency mechanisms). Plant P-efficiency mechanisms include both improved uptake efficiency (the ability of a plant to take up more P under P limiting condition) and improved utilization efficiency (the ability of a plant to produce higher dry matter yield per unit P taken up). Uptake efficiency mechanisms include modification of root architecture, development of large root system, longer root hairs and thinner roots, exudation of low molecular weight organic acids, protons and enzymes such as phosphatases and phytases, association with mycorrhiza, production of cluster roots and expression of high affinity P transporters all of which contribute to increased P uptake efficiency of the plant. Other mechanisms include the use of alternative P-independent enzymes and glycolytic pathways, efficient cytoplasmic P homeostasis and higher ability to remobilize P from other plant parts all of which are part of enhanced P utilization efficiency. Traits related to the above morphological, physiological, biochemical and molecular adaptation mechanisms under P stress can be utilized in improving cultivated crops for P efficiency through breeding programs.

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“…A pot experiment was carried out during the winter season of 2006/2007 in the greenhouse conditions at the experimental farm, Faculty of Agriculture at Qena, South Valley University, to study the supplying power of P using Ryegrass (Lolium perenne L.) plants as a test plants as described by (Soltan et al, 1993). Surface and Sub-surface samples of the 105 soil location samples which represent the different soils of great-groups were used (22, 23, 13 and 47) soil location samples represent the Vtt, Eftt, Epqt and Eott soils great groups, respectively.…”

Section: -Phosphorous Supplying Power Of Soilsmentioning

confidence: 99%

Phosphorus Status in Soils of Great Groups in Qena Governorate

Ragheb

Attia

El-Galil

et al. 2010

Journal of Environmental Studies

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The present. investigation was carried out to study the phosphorus status of different soil great -groups present in Qena Governorate .The soil in Qena Governorate is belonged to the following great -groups :Vtt, Eftt, Epqt and Eott. One hundred and five location samples distributed all over the entire area representing the soils of each great group in each territory of Qena Governorate were prepared. The P status of the soils of each great -group was assessed using a variety of chemical extraction methods. A pot experiment was also carried out to study the supplying power of P using Reygrass plants. The obtained results shows that:-The bicarbonate extractable inorganic P (NaHCO3-Pi) in the studied soil samples of different great -groups showed a wide variations that cooped with different chemical of these soils . The amount of Pi in the surface layers of the soils of all great-groups were noticeably higher than that of sub-surface ones. The bicarbonate extractable organic P ( NaCO3-Po) contents in the studied soils were different between soils of -great groups and among the soils of each great -groups. The values of total bicarbonate extractable phosphorus (NaHCO3-Pt) showed a considerable variation in Pt among various samples. The data also indicated that Pt in soil generally decreased as the soils became coarse in texture, low in organic content and in total CaCO3 content. P uptake by Raygrass was positively and significantly (P<0.05) correlated with both bicarbonate extractable P forms Pi and Po as well as the total bicarbonate extractable phosphorus Pt .The pearson simple correlation coefficients for the P uptake against Pi, Po and Pt were 0.7817**,0.7823**and 0.8215**, respectively.

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Phosphate sorption by Egyptian, Ethiopian and German soils and P uptake by rye (Secale cereale L.) seedlings

Abstract: Summary -Zusammenfassung

Cited by 12 publications

References 10 publications

The acquisition of phosphate by higher plants: Effect of carboxylate release by the roots. A critical review.

The acquisition of phosphate by higher plants: Effect of carboxylate release by the roots. A critical review.

Management of soil phosphorus and plant adaptation mechanisms to phosphorus stress for sustainable crop production: a review

Phosphorus Status in Soils of Great Groups in Qena Governorate

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