Measuring Agronomic and Environmental Soil Phosphorus Saturation and Predicting Phosphorus Leaching with Mehlich 3

Maguire, Rory O.; Sims, J. T.

doi:10.2136/sssaj2002.2033

Cited by 184 publications

(174 citation statements)

References 24 publications

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“…Other investigators have observed that the PSR can be a tool to predict P leaching and runoff (Maguire and Sims, 2002). The PSR values for soils in this study were all below 0.12, which is lower than the changepoint of 0.20 beyond which PSR and P leaching were highly correlated (Maguire and Sims, 2002).…”

Section: Impact Of Fertilizers On Phosphorus In Soilscontrasting

confidence: 51%

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Nutrient losses from manure and fertilizer applications as impacted by time to first runoff event

Smith

Owens

Leytem

et al. 2007

Environmental Pollution

152

132

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Fertilization with manures results in lower nutrient runoff than inorganic fertilizers, especially if at least one week passes between fertilization and runoff.Abstract Nutrient losses to surface waters following fertilization contribute to eutrophication. This study was conducted to compare the impacts of fertilization with inorganic fertilizer, swine (Sus scrofa domesticus) manure or poultry (Gallus domesticus) litter on runoff water quality, and how the duration between application and the first runoff event affects resulting water quality. Fertilizers were applied at 35 kg P ha-1-, and the duration between application and the first runoff event varied between 1 and 29 days. Swine manure was the greatest risk to water quality 1 day after fertilization due to elevated phosphorus (8.4 mg P L -1) and ammonium (10.3 mg NH4-N L-1) concentrations; however, this risk decreased rapidly. Phosphorus concentrations were 2.6 mg L -1 29 days after fertilization with inorganic fertilizer. This research demonstrates that manures might be more environmentally sustainable than inorganic fertilizers, provided runoff events do not occur soon after application. Crown

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Section: Impact Of Fertilizers On Phosphorus In Soilscontrasting

confidence: 51%

“…The extracts were then analyzed using ICAP-OES for concentrations of P, Al and Fe. A P sorption ratio (PSR) for soils was calculated from the Mehlich 3 data as: (mmol P)/(mmol Al + mmol Fe), as per Maguire and Sims (2002).…”

Section: Vt =Evi Xtimentioning

confidence: 99%

Nutrient losses from manure and fertilizer applications as impacted by time to first runoff event

Smith

Owens

Leytem

et al. 2007

Environmental Pollution

152

132

View full text Add to dashboard Cite

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“…Higher values of Fe+Al calculated with ammonium oxalate were found in soils with higher clay contents, although a high maximum value of 1,797 mg kg -1 was also obtained for sandy soils. In general, ammonium oxalate extracts greater amounts of Fe+Al than Mehlich-1 and Mehlich-3, mainly in soils with higher clay content (Maguire & Sims, 2002;Nair et al, 2004).…”

Section: Resultsmentioning

confidence: 92%

“…P PSI 75 , single P sorption point; and Fe+Al M1 , Fe+Al M3 , and Fe+Al OX , Fe+Al calculated with Mehlich-1, Mehlich-3, and ammonium oxalate, respectively. tests (Maguire & Sims, 2002). Ammonium oxalate is not often used in these tests in Southern Brazil, being only used to determine Fe content in soils (Tedesco et al, 2004).…”

Section: Resultsmentioning

confidence: 99%

Degree of phosphorus saturation threshold for minimizing P losses by runoff in cropland soils of Southern Brazil

Bortolon

Ernani

Bortolon

et al. 2016

Pesq. agropec. bras.

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-The objective of this work was to assess the risk of phosphorus losses by runoff through an index based on the degree of P saturation (DPS), in cropland soils of Southern Brazil. Sixty-five highly representative cropland soils from the region were evaluated. Three labile P forms were measured (Mehlich-1, Mehlich-3, and ammonium oxalate), and four P sorption indexes were tested (phosphorus single sorption point and Fe+Al determined with the three extractors). Water-extractable P (WEP) was used as an index of P susceptibility to losses by surface runoff. The DPS was determined from the ratio between labile P and each sorption index. DPS values obtained from the ratio between Mehlich-1 P and the single P sorption point ranged from 1 to 25%, whereas those from Mehlich-1 P and Fe+Al (ammonium oxalate) ranged from 1 to 55%. All DPS types were highly correlated with WEP. From a practical stand point, the DPS obtained with both P and Fe+Al extracted with Mehlich-1 can be used to estimate the risk of P losses by runoff in soils of Southern Brazil.Index terms: eutrophication, runoff, single P sorption point, water quality. Limite do grau de saturação de fósforo para minimizar perdas de P por escorrimento superficial em solos agrícolas do Sul do BrasilResumo -O objetivo deste trabalho foi avaliar o risco de perdas de fósforo por escorrimento superficial por meio de um índice baseado no o grau de saturação de P (GSP) no solo, em solos agrícolas do Sul do Brasil. Foram avaliados 65 solos agrícolas representativos da região. Três formas lábeis de P foram medidas (Mehlich-1, Mehlich-3 e oxalato de amônio), e quatro índices de adsorção de P foram testados (adsorção de P em único ponto e Fe+Al obtido com os três extratores). O P extraível em água (PEA) foi utilizado como índice de suscetibilidade do P a perdas por escoamento superficial. O GSP foi obtido a partir do quociente entre a forma lábil de P e cada índice de adsorção. Os valores do GSP obtidos a partir do quociente entre P Mehlich-1 e a adsorção de P em único ponto variaram de 1 a 25%, enquanto os entre P Mehlich-1 e Fe+Al (oxalato de amônio) variaram de 1 a 55%. Todos os tipos de GSP estiveram altamente correlacionados ao PEA. Do ponto de vista de uso prático, o GSP obtido com P e Fe+Al extraídos com Mehlich-1 pode ser usado para estimar o risco de perda de P por escorrimento superficial em solos do Sul do Brasil.Termos para indexação: eutrofização, escorrimento superficial, P em único ponto, qualidade de água.

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“…Another risk of P-mobilizing species is that the mobilized P might leach and reach the groundwater and then streams and rivers, contributing to their eutrophication (Djodjic et al 2004). This risk should be managed by measuring both agronomic and environmental soil P saturation, and fertilizing accordingly (Maguire and Sims 2002).…”

Section: Perspectives For Existing and Future P-acquisition-efficientmentioning

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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Measuring Agronomic and Environmental Soil Phosphorus Saturation and Predicting Phosphorus Leaching with Mehlich 3

Cited by 184 publications

References 24 publications

Nutrient losses from manure and fertilizer applications as impacted by time to first runoff event

Nutrient losses from manure and fertilizer applications as impacted by time to first runoff event

Degree of phosphorus saturation threshold for minimizing P losses by runoff in cropland soils of Southern Brazil

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

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