Use and Limitations of Physical-Chemical Criteria for Assessing the Status of Phosphorus in Soils

Khasawneh, F. E.

doi:10.2134/1980.roleofphosphorus.c15

Cited by 34 publications

(32 citation statements)

References 145 publications

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“…These are in turn related through the P buffering capacity (PBC), d Q /d I , that is, the ability of the soil solid phase to maintain the concentration of P in solution (Mattingly, ; Bache, ; Frossard et al ., ). These factors are operationally defined and measured via appropriate laboratory methods (Fox & Kamprath, ; Olsen & Khasawneh, ). The phytoavailability of soil P is additionally influenced by the ‘mobility’ factor (viz.…”

Section: Introductionmentioning

confidence: 99%

Critical Olsen P and CaCl₂‐P levels as related to soil properties: results from micropot experiments

Sánchez-Alcalá

Campillo

Torrent

2015

Soil Use and Management

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The usefulness of soil phosphorus (P) tests used in routine soil analyses is limited by the fact that a single measurement cannot encompass all P-related factors potentially affecting plant performance. In this work, we performed micropot (15 mL) experiments to test the hypothesis that the predictive value of two common soil P tests (Olsen P and CaCl 2 -P) can be improved by considering properties commonly measured in laboratory analyses. Forty-nine sets of soils ranging widely in properties were used for this purpose, each set consisting of samples with similar properties but differing in P status. Ryegrass and turnip were grown in a chamber for 30 days in two separate experiments and their yields at harvest recorded. The critical Olsen P and CaCl 2 -P levels, which were taken to be those corresponding to 95% asymptotic yield as calculated from data fitted to a Mitscherlich equation, were greater for turnip than for ryegrass, probably as a result of the difference in yield (49 and 160 mg dry matter/micropot on average for ryegrass and turnip, respectively) and hence in P requirements between the two species. Critical Olsen P spanned narrower ranges than critical CaCl 2 -P in both crops and is therefore seemingly the more robust of the two tests. Both critical P values exhibited moderate correlations with soil properties. Thus, critical Olsen P was (a) lower in soils with a medium pHwhich is consistent with the fact that the bicarbonate solution method tends to overestimate plant-available P in strongly acid and calcareous soils; (b) positively correlated with pH and carbonate content in calcareous soils; and (c) uncorrelated with soil properties in noncalcareous soils. On the other hand, critical CaCl 2 -P in some soil groups was negatively correlated with some properties increasing the P buffering capacity of soil (e.g. Fe oxide content). Taken together, our results suggest that routinely measured soil properties help to predict critical Olsen P better than critical CaCl 2 -P.

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Section: Introductionmentioning

confidence: 99%

Critical Olsen P and CaCl₂‐P levels as related to soil properties: results from micropot experiments

Sánchez-Alcalá

Campillo

Torrent

2015

Soil Use and Management

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“…A phosphate adsorption isotherm is a graphical presentation for describing the adsorption of P by, or desorption of P from the soil solid phase as a function of the P equilibrium concentration in the soil solution at constant temperature and pressure [39, 71,72]. According to [73,74] an isotherm from a plot of phosphate retained against different equilibrium P concentrations can be divided into three regions. The regions correspond to three distinct stages in soilphosphate interactions.…”

Section: Phosphate Adsorption Isothermsmentioning

confidence: 99%

Understanding Soil Phosphorus

Muindi

2019

IJPSS

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Phosphorus is the second most important crop nutrient after Nitrogen. It is an essential macronutrient that plays important role in all crop biochemical processes such as photosynthesis, respiration, energy storage, transfer, cell division, cell enlargement and nitrogen fixation. It is also important in seed germination, seedling establishment, root, shoot, flower and seed development. Despite its importance in crop nutrition, availability of the nutrient in soils for plant uptake is limited by several soil factors. The factors include: soil pH levels, clay mineralogy, organic matter, free iron and aluminium, calcium carbonate, soil temperatures and availability of other nutrients among other factors. Availability of phosphorus for plant uptake can be managed by adoption of practices such as liming acidic soils, application of organic amendments in both alkaline and acidic soils, tillage practices and regulation of time and method of P fertilizer application.

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“…of P in soil solution conc. of P in the soil 1The traditional approach of determining PBC in soil is to add various amounts of P to a soil suspension, equilibrate, and then measure the slope between adsorbed P and P in soil solution (Olsen and Khasawneh, 1980). Alternatively, PBC can be measured by analyzing the change in soil solution P concentration with regard to P budget in field P fertilization experiments (Morel et al, 2000).…”

Section: Pbc =mentioning

confidence: 99%

“…In other words, soils with higher K m values were characterized by slower increases in P w at similar yearly P input-output budgets, and vice versa. Both PBC and K m are measures which describe the exchange of P between the soil solution and solid phases (Olsen and Khasawneh, 1980;Fardeau et al, 1991). However, the two have never been directly related.…”

Section: K M Buffers Fertilizer Application In Long-term Fertilizer Ementioning

confidence: 99%

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Soil solution phosphorus turnover: derivation, interpretation, and insights from a global compilation of isotope exchange kinetic studies

Helfenstein¹,

Jegminat²,

McLaren³

et al. 2017

Preprint

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Abstract. The exchange rate of inorganic phosphorus (P) between the soil solution and solid phase, also known as soil solution P turnover, is essential for describing the kinetics of bioavailable P. While soil solution P turnover (Km) can be determined by tracing radioisotopes in a soil-solution system, few studies have done so. We believe that this is due to a lack of understanding on how to derive Km from isotopic exchange kinetic (IEK) experiments, a widespread form of radioisotope dilution study. Here, we provide a derivation of calculating Km using parameters obtained from IEK experiments. We then calculated Km for 217 soils from published IEK experiments in terrestrial ecosystems, and also for that of 18 long-term P fertilizer field experiments. Analysis of the global compilation dataset revealed a negative relationship between concentrations of soil solution P and Km. Furthermore, Km buffered isotopically exchangeable P in soils with low concentrations of soil solution P. This finding was supported by an analysis of long-term P fertilizer field experiments, which revealed a negative relationship between Km and phosphate buffering capacity. Our study thus highlights the potential of Km for future studies &#8211; not only for P, but also for other environmentally-relevant, strongly-sorbing elements with radioisotopes such as zinc, cadmium, nickel, arsenic, or uranium.

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Use and Limitations of Physical-Chemical Criteria for Assessing the Status of Phosphorus in Soils

Cited by 34 publications

References 145 publications

Critical Olsen P and CaCl₂‐P levels as related to soil properties: results from micropot experiments

Critical Olsen P and CaCl₂‐P levels as related to soil properties: results from micropot experiments

Understanding Soil Phosphorus

Soil solution phosphorus turnover: derivation, interpretation, and insights from a global compilation of isotope exchange kinetic studies

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Use and Limitations of Physical-Chemical Criteria for Assessing the Status of Phosphorus in Soils

Cited by 34 publications

References 145 publications

Critical Olsen P and CaCl2‐P levels as related to soil properties: results from micropot experiments

Critical Olsen P and CaCl2‐P levels as related to soil properties: results from micropot experiments

Understanding Soil Phosphorus

Soil solution phosphorus turnover: derivation, interpretation, and insights from a global compilation of isotope exchange kinetic studies

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Critical Olsen P and CaCl₂‐P levels as related to soil properties: results from micropot experiments

Critical Olsen P and CaCl₂‐P levels as related to soil properties: results from micropot experiments