Phosphorus sorption in relation to soil properties for the major soil types of South-Western Australia

Singh, Balwant; Gilkes, R. J.

doi:10.1071/sr9910603

Cited by 113 publications

(84 citation statements)

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“…Thus, in these conditions of greater buffering of the soil acidity, and in a particular way for the soils with greater initial pH, the loss of extraction capacity of the acidity of the extractant becomes more expressive (Novais and Smyth, 1999;Nolla and Anghinoni, 2006;Viégas et al, 2010). It is noteworthy that these three soils have greater contents of OM and of Rem-P, which suggests a probable negative correlation between OM content and the MPAC or PBC of these soils, as also found by Singh and Gilkes (1991) in samples of 97 highly weathered soils of Australia.…”

Section: Methodsmentioning

confidence: 56%

Loss of Extraction Capacity of Mehlich-1 and Monocalcium Phosphate as a Variable of Remaining P and Its Relationship to Critical Levels of Soil Phosphorus and Sulfur

Novais

Mattiello

Vergütz

et al. 2015

Rev. Bras. Ciênc. Solo

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the Mehlich-1 (M-1) extractant and Monocalcium phosphate in acetic acid (Mcpa) have mechanisms for extraction of available p and s in acidity and in ligand exchange, whether of the sulfate of the extractant by the phosphate of the soil, or of the phosphate of the extractant by the sulfate of the soil. in clayey soils, with greater p adsorption capacity, or lower remaining p (rem-p) value, which corresponds to soils with greater phosphate buffer capacity (pbc), more buffered for acidity, the initially low ph of the extractants increases over their time of contact with the soil in the direction of the ph of the soil; and the sulfate of the M-1 or the phosphate of the Mcpa is adsorbed by adsorption sites occupied by these anions or not. this situation makes the extractant lose its extraction capacity, a phenomenon known as loss of extraction capacity or consumption of the extractant, the object of this study. twenty soil samples were chosen so as to cover the range of rem-p (0 to 60 mg L -1 ). rem-p was used as a measure of the pbc. the p and s contents available from the soil samples through M-1 and Mcpa, and the contents of other nutrients and of organic matter were determined. for determination of loss of extraction capacity, after the rest period, the ph and the p and s contents were measured in both the extracts-soils. Although significant, the loss of extraction capacity of the acidity of the M-1 and Mcpa extractants with reduction in the rem-p value

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Section: Methodsmentioning

confidence: 56%

Loss of Extraction Capacity of Mehlich-1 and Monocalcium Phosphate as a Variable of Remaining P and Its Relationship to Critical Levels of Soil Phosphorus and Sulfur

Novais

Mattiello

Vergütz

et al. 2015

Rev. Bras. Ciênc. Solo

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“…1985;Singh & Gilkes 1991). But in most studies only surface soils are taken for measuring adsorption characteristics, although some studies have used subsurface soil samples (e.g., Bolan & Baskaran 1996a).…”

Section: Introductionmentioning

confidence: 99%

“…However, there were no consistent relationships between these soil properties and phosphate adsorption. This may be due to the presence of different types of clay minerals that affect P sorption (Singh & Gilkes 1991) Surface area Fig. 4 Relationship between sorption coefficients of atrazine and phosphate, and related soil properties in nonallophanic soils.…”

mentioning

confidence: 99%

Adsorption of atrazine and phosphate as affected by soil depth in allophanic and non‐allophanic soils

Magesan

Bolan

Lee

2003

New Zealand Journal of Agricultural Research

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Quantification of soil processes, such as adsorption, is needed for predicting the fate of agricultural chemicals in soils. Adsorption is affected by soil properties, which vary with depth. We conducted a laboratory study to determine the influence of soil depth on the adsorption of an organic solute (atrazine) in both allophanic and non-allophanic soils, and an inorganic solute (phosphate) in two non-allophanic soils. Adsorption isotherms of atrazine and phosphate were determined using 14 C-labelled atrazine and KH 2 PO 4 , respectively, in batch equilibrium. The adsorption isotherms for atrazine were almost linear, and adequately described by the Freundlich equation. For phosphate the adsorption isotherms exhibited substantially more curvature and were best described by the Langmuir equation for one of the soils. Generally, adsorption of both solutes decreased with depth. While atrazine adsorption appeared related to such factors as percentage clay content, total C, cation exchange capacity (CEC), and surface area, no similar relationships appeared apparent for phosphate adsorption.

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“…Many are also used for horticultural purposes (Betulaceae, Cyperaceae, Elaeagnaceae, Fabaceae, Moraceae, Proteaceae, Restionaceae) and in restoration. Considering that P reserves are rapidly being depleted (Steen 1998), whilst vast amounts are present in soils that have been fertilized for decades (Singh and Gilkes 1991), we should consider options for incorporating root clusters in new crop species or cropping systems.…”

Section: Existing Crop Plants With a High P-acquisition Efficiencymentioning

confidence: 99%

Role of Root Clusters in Phosphorus Acquisition and Increasing Biological Diversity in Agriculture

Lambers¹,

Shane²

Scale and Complexity in Plant Systems Research

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Abstract. Soils in the south-west of Western Australia and South Africa are among the most phosphorusimpoverished in the world, and at the same time both of these regions are Global Biodiversity Hotspots. This unique combination offers an excellent opportunity to study root adaptations that are significant in phosphorus (P) acquisition. A large proportion of species from these P-poor environments cannot produce an association with mycorrhizal fungi, but, instead, produce 'root clusters'. In Western Australia, rootcluster-bearing Proteaceae occur on the most P-impoverished soils, whereas the mycorrhizal Myrtaceae tend to inhabit the less P-impoverished soils in this region. Root clusters are an adaptation both in structure and in functioning; characterized by high densities of short lateral roots that release large amounts of exudates, in particular carboxylates (anions of di-and tri-carboxylic acids). The functioning of root clusters in Proteaceae ('proteoid' roots) and Fabaceae ('cluster' roots) has received considerable attention, but that of 'dauciform' root clusters developed by species in Cyperaceae has barely been explored. Research on the physiology of 'capillaroid' root clusters formed by species in Restionaceae has yet to be published. Root-cluster initiation and growth in species of the Cyperaceae, Fabaceae and Proteaceae are systemically stimulated when plants are grown at a very low P supply, and are suppressed as leaf P concentrations increase. Root clusters in Proteaceae, Fabaceae and Cyperaceae are short-lived structures, which release large amounts of carboxylates, briefly, at a particular stage of root development. The rates of carboxylate release are considerably faster than reported for non-specialized roots of a wide range of species. Root clusters play a pivotal role in mobilization of P from P-sorbing soil. Because the world P reserves are being depleted whilst vast amounts of P are stored in fertilized soils, there is a growing need for crops with a high efficiency of P acquisition. Some Australian and African native species as well as some existing crops have traits that would be highly desirable for future crops. The possibilities of introducing P-acquisition-efficient species in new cropping and pasture systems are explored. In addition, possible strategies to introduce traits associated with a high P-acquisition efficiency into future crop species are discussed.

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Phosphorus sorption in relation to soil properties for the major soil types of South-Western Australia

Cited by 113 publications

References 0 publications

Loss of Extraction Capacity of Mehlich-1 and Monocalcium Phosphate as a Variable of Remaining P and Its Relationship to Critical Levels of Soil Phosphorus and Sulfur

Loss of Extraction Capacity of Mehlich-1 and Monocalcium Phosphate as a Variable of Remaining P and Its Relationship to Critical Levels of Soil Phosphorus and Sulfur

Adsorption of atrazine and phosphate as affected by soil depth in allophanic and non‐allophanic soils

Role of Root Clusters in Phosphorus Acquisition and Increasing Biological Diversity in Agriculture

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