Phosphate-rich soils in the European Union: estimating total plant-available phosphorus

Delgado, Antonio; Torrent, J.

doi:10.1016/s1161-0301(96)02048-5

Cited by 62 publications

(59 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This was also in agreement with results by Tandy et al (2011) who did not observe significant relationship between Olsen P and P in plant in a group of soils ranging widely in pH. On average, P extracted by plants accounted for the expected total available P in soil according to Delgado and Torrent (1997), which was 1.5 times Olsen P, thus explaining the evident P deficiency symptoms observed at the end of the experiment (Fig. 1).…”

Section: Resultssupporting

confidence: 92%

“…From the excess of 200 mg P kg −1 in the sum of inorganic P fractions of high-P relative to low-P samples, only 63 mg kg −1 were recovered in the fractions corresponding to the most readily desorbable P (NaOH+cb; Table 2) and only 15 mg kg −1 by bicarbonate (Olsen's method). According to the ratio of total plant-available P to Olsen P defined by Delgado and Torrent (1997) in similar soils (total available P was roughly equivalent to 1.5 times Olsen P), this means that approximately a 10 % of applied P remained readily available to plants. It should be noted that non-significant differences were observed in total organic P or organic fractions between highand low-P samples (Table 1).…”

Section: Resultsmentioning

confidence: 99%

“…This estimation is based on chemical extractions as a proxy for the P potentially releasable from the solid phase and thus available to plants (Kpomblekou and Tabatabai 1997;Delgado et al 2010). Depending on soil properties and dominant P forms, different relationships between extractable and plant-available P can be expected (Mallarino 1997;Delgado and Torrent 1997;2001), thus making it impossible to adopt a universal method to assess available P in soil (Delgado and Scalenghe 2008;Tandy et al 2011). This justifies that, only in Europe, 16 P extraction methods to assess plant-available P have been proposed (Neyroud and Lischer 2003;Tóth et al 2014).…”

Section: Introductionmentioning

confidence: 99%

“…All these factors contribute to explain the poor relationship frequently observed between a widely used index such as Olsen P (bicarbonateextractable P; Olsen et al 1954) and P uptake by plants (Kulhánek et al 2007), even in soils with similar properties (Delgado et al 2010). To overcome this limitation, other methods theoretically sensitive to soil PBC such as the use of near infinite sinks (i.e., Fe oxides, Delgado and Torrent 1997;or resins, Delgado et al 2010) or to the study of diffusive gradients in thin films (DGT; Mason et al 2010;Tandy et al 2011) have been proposed. Also, corrections of traditional indexes based on single soil properties could lead to more accurate assessing of available soil P thus to more accurate P fertilization recommendations (Delgado et al 2010).…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

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.

View full text Add to dashboard Cite

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.

show abstract

Section: Resultssupporting

confidence: 92%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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.

View full text Add to dashboard Cite

show abstract

“…The mean value of the Fe ox /Fe d for the studied soils was 0.16, indicating that most Fe oxides were crystalline. Our soils differ strongly from the nine "overfertilized soils of Europe" [68] where the average ratio of Fe ox /Fe d was 0.44, indicating much lower degree of Fe oxide crystallinity. Even though the Fe ox was higher in our Ethiopian soils, the difference arises mainly from the fact that the Fe d content in the Ethiopian soils was as much as fivefold compared to the European soils, reflecting the difference in soil age and degree of pedogenic development.…”

Section: Olsen P Oxalate Extractable P Al and Fe And Dithionitecontrasting

confidence: 72%

Phosphorus Status, Inorganic Phosphorus Forms, and Other Physicochemical Properties of Acid Soils of Farta District, Northwestern Highlands of Ethiopia

Melese

Gebrekidan

Yli‐Halla

et al. 2015

Applied and Environmental Soil Science

View full text Add to dashboard Cite

Soil acidity and low availability of P limit crop production in the highlands of Ethiopia. The objective of this study was to determine the P status, distribution and forms of inorganic P and relate them to selected chemical properties of eight representative acidic surface soil samples from Farta District. Soil pH (H 2 O) varied between 4.74 and 5.50. The moderate to high CEC suggests that besides kaolinite, the soils also contain expandable 2 : 1 clay minerals. Though the total P content was high, the available Olsen P content was very low or low in all soils except one. In most soils, the abundance of inorganic P fractions was as follows: P bound by oxalate extractable iron (Fe ox -P) > reductant soluble Fe-P > occluded Al-Fe-P > P bound by oxalate extractable aluminum (Al ox -P) > calcium bound P (Ca-P). Olsen P had a very strong positive correlation ( ≤ 0.01) with Al ox -P ( = 0.98), Fe ox -P ( = 0.96), and oxalate extractable P ( = 0.94). Though Fe bound P reserves were quite abundant and the degree of P saturation of Al ox + Fe ox (median 3.3%) was moderate, the extremely low P saturation of Al ox (median 0.5%) explains the P deficiency of the soils.

show abstract

Phosphorus recovery from hydrothermal carbonization of organic waste: a review

Khalaf

Leahy

Kwapiński

2023

J of Chemical Tech & Biotech

View full text Add to dashboard Cite

BackgroundThis review sheds light on the topic of phosphorus (P) recovery from hydrothermal carbonization (HTC) of organic waste. The paper focuses on the rising need for securing alternative P sources for the increasing demand, in addition to the development of HTC as a thermochemical technique for waste valorization.ResultsThis article studies the definition of P‐recovery from HTC, while introducing the notion of availability, which is a significant factor for studying the efficiency of P‐recovery. A brief comparison between different treatment techniques for P‐recovery from waste streams is presented, and the advantages of HTC are highlighted among different thermochemical techniques. Furthermore, the mechanisms of P‐transformation during HTC reactions are studied, and the effect of various parameters on P‐destination and recovery is emphasized. Finally, applications of P‐recovery from HTC products on the laboratory and industrial scales are studied to assess the feasibility of the application.ConclusionIn short, the paper offers a detailed insight into the definition, mechanism, and potential feasibility of P‐recovery from HTC of organic wastes within the scopes of resource management, waste valorization, and fertilizer production. Even though HTC for P‐recovery from organic waste has been applied on laboratory and industrial scales, several challenges persist towards optimizing this process. The paper concludes that adopting P‐availability as a criterion for efficiency is necessary to optimize HTC conditions for P‐recovery. Further studies on P‐transformation during later‐stage reactions of HTC are recommended, as well. © 2023 The Authors. Journal of Chemical Technology and Biotechnology published by John Wiley & Sons Ltd on behalf of Society of Chemical Industry (SCI).

show abstract

Phosphate-rich soils in the European Union: estimating total plant-available phosphorus

Cited by 62 publications

References 20 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

Phosphorus Status, Inorganic Phosphorus Forms, and Other Physicochemical Properties of Acid Soils of Farta District, Northwestern Highlands of Ethiopia

Phosphorus recovery from hydrothermal carbonization of organic waste: a review

Contact Info

Product

Resources

About