The Olsen P/solution P relationship as affected by soil properties

Sánchez-Alcalá, I.; Campillo, M. C. del; Barrón, Vidal; Torrent, J.

doi:10.1111/sum.12141

Cited by 14 publications

(13 citation statements)

References 35 publications

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“…To overcome this limitation, a more accurate definition of threshold values for soil P indices on the basis of the aforementioned factors is required. A simple model was proposed for Olsen P by Sánchez-Alcalá et al (2014), which was however limited since it only considered the short-term equilibrium of inorganic P in soil. Also, our results are of practical interest for designing new P indices which should rely on chemical P extractions sensitive to these factors.…”

Section: Resultsmentioning

confidence: 99%

Accuracy of Olsen P to assess plant P uptake in relation to soil properties and P forms

Recena

Torrent

Campillo

et al. 2015

Agron. Sustain. Dev.

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Efficient use of phosphorus (P) by plants in agriculture relies on accurate estimation of the phytoavailable soil P. However, poor relationships are frequently observed between P availability indices, such as Olsen P, and P uptake by plants. We therefore studied which soil properties modify the accuracy of Olsen P as a P availability index. We conducted a soil P depletion experiment in pots with 17 soils. Two samples differing widely in Olsen P were used for each soil and named "low-P" and "high-P." Soil was mixed with siliceous sand to achieve 1 mg of Olsen P per pot, so that the ratio of non-readily available P, either inorganic P or organic P, to Olsen P in the pot was higher for low-P than for high-P samples. Results show that, in high-P samples, P uptake by cucumber is positively correlated with the affinity of the soil solid phase for P, with R 2 of 0.76. In high-P samples, P uptake by cucumber is positively correlated with total P adsorption capacity as estimated by Fe in the form of Fe oxides, with R 2 = 0.56. P uptake is positively correlated with the inorganic P released by NaOH and citrate-bicarbonate in low-P samples, with R 2 of 0.52. In low-P samples, total organic P and phosphatase activity in the rhizosphere explained 37 % of plant P uptake. In low-P samples, phosphatase activity and pH explained 50 % of plant P uptake. These findings reveal that organic P forms and hydrolytic activity by roots are explaining P availability to plants. Whereas physico-chemical processes controlling inorganic P dynamics play a major role for low organic P/Olsen P ratios.

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Section: Resultsmentioning

confidence: 99%

Accuracy of Olsen P to assess plant P uptake in relation to soil properties and P forms

Recena

Torrent

Campillo

et al. 2015

Agron. Sustain. Dev.

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“…4). For example, lowering of critical STP values will be possible on soils with lower capacities to strongly adsorb P (Holford 1980;Sánchez-Alcalá et al 2014). Furthermore, crops with extensive rooting systems on wellstructured soils typically need less STP in the soil for optimum crop yields than soils on thin, compacted, or poorly structured soils.…”

Section: Soil Crop and Nutrient Managementmentioning

confidence: 99%

Integrating legacy soil phosphorus into sustainable nutrient management strategies for future food, bioenergy and water security

Rowe

Withers

Baas

et al. 2015

Nutr Cycl Agroecosyst

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185

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Legacy phosphorus (P) that has accumulated in soils from past inputs of fertilizers and manures is a large secondary global source of P that could substitute manufactured fertilizers, help preserve critical reserves of finite phosphate rock to ensure future food and bioenergy supply, and gradually improve water quality. We explore the issues and management options to better utilize legacy soil P and conclude that it represents a valuable and largely accessible P resource. The future value and period over which legacy soil P can be accessed depends on the amount present and its distribution, its availability to crops and rates of drawdown determined by the cropping system. Full exploitation of legacy P requires a transition to a more holistic system approach to nutrient management based on technological advances in precision farming, plant breeding and microbial engineering together with a greater reliance on recovered and recycled P. We propose the term 'agro-engineering' to encompass this integrated approach. Smaller targeted applications of fertilizer P may still be needed to optimize crop yields where legacy soil P cannot fully meet crop demands. Farm profitability margins, the need to recycle animal manures and the extent of local eutrophication problems will dictate when, where and how quickly legacy P is best exploited. Based on our analysis, we outline the stages and drivers in a transition to the full utilization of legacy soil P as part of more sustainable regional and global nutrient management.

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“…This experimental setting allowed the constraints imposed by soil structure (Johnston & Poulton, ) and pedoclimate during the growth period (Johnston et al ., ), which have a strong impact on the mobility factor, to be minimized, and the effect of intrinsic soil properties on critical P levels to be more accurately assessed. The other objective was to test the hypothesis of whether a test reflecting I in combination with soil properties would perform better than Olsen P – which is more closely related to Q than to I (Sánchez‐Alcalá et al ., ). To this end, the concentration of P in the 0.01 m CaCl 2 soil extract, which is highly correlated with that in the soil solution (Sánchez‐Alcalá et al ., ) and frequently used in soil tests (Houba et al ., ; Reijneveld et al ., ), was studied.…”

Section: Introductionmentioning

confidence: 97%

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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The Olsen P/solution P relationship as affected by soil properties

Cited by 14 publications

References 35 publications

Accuracy of Olsen P to assess plant P uptake in relation to soil properties and P forms

Accuracy of Olsen P to assess plant P uptake in relation to soil properties and P forms

Integrating legacy soil phosphorus into sustainable nutrient management strategies for future food, bioenergy and water security

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

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The Olsen P/solution P relationship as affected by soil properties

Cited by 14 publications

References 35 publications

Accuracy of Olsen P to assess plant P uptake in relation to soil properties and P forms

Accuracy of Olsen P to assess plant P uptake in relation to soil properties and P forms

Integrating legacy soil phosphorus into sustainable nutrient management strategies for future food, bioenergy and water security

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

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