Phosphate minerals and solubility in native and agricultural calcareous soils

Zhang, Min; Li, Chengliang; Li, Y.C.; Harris, Willie G.

doi:10.1016/j.geoderma.2014.05.015

Cited by 42 publications

(25 citation statements)

References 22 publications

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“…P solubility in soil Fors showed a minimum at pH 7.8. With a bulk soil pH CaCl2 of 7.8, acidification of the calcareous soil in our study should result in P solubilization if Ca-P minerals are present, which is likely according to published information on P speciation in such high Ca soil (Eriksson et al 2016; Luo et al 2017; McLaren et al 2015; Zhang et al 2014), and in line with the measured increase of P solubility in soil Fors when pH was lowered from 7.8 to 7 (Eriksson et al 2016). …”

Section: Discussionmentioning

confidence: 57%

In situ observation of localized, sub-mm scale changes of phosphorus biogeochemistry in the rhizosphere

et al. 2018

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AimsWe imaged the sub-mm distribution of labile P and pH in the rhizosphere of three plant species to localize zones and hot spots of P depletion and accumulation along individual root axes and to relate our findings to nutrient acquisition / root exudation strategies in P-limited conditions at different soil pH, and to mobilization pattern of other elements (Al, Fe, Ca, Mg, Mn) in the rhizosphere.MethodsSub-mm distributions of labile elemental patterns were sampled using diffusive gradients in thin films and analysed using laser ablation inductively coupled plasma mass spectrometry. pH images were taken using planar optodes.ResultsWe found distinct patterns of highly localized labile P depletion and accumulation reflecting the complex interaction of plant P acquisition strategies with soil pH, fertilizer treatment, root age, and elements (Al, Fe, Ca) that are involved in P biogeochemistry in soil. We show that the plants respond to P deficiency either by acidification or alkalization, depending on initial bulk soil pH and other factors of P solubility.ConclusionsP solubilization activities of roots are highly localized, typically around root apices, but may also extend towards the extension / root hair zone.Electronic supplementary materialThe online version of this article (10.1007/s11104-017-3542-0) contains supplementary material, which is available to authorized users.

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Section: Discussionmentioning

confidence: 57%

In situ observation of localized, sub-mm scale changes of phosphorus biogeochemistry in the rhizosphere

et al. 2018

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“…That notwithstanding, phosphorous enrichment relative to other strata in the same sequence must be born in mind when inferring anthropic activity (Mujika Alustiza et al, , p. 231). Under such conditions, phosphate reacts with Ca to form scantly soluble compounds (Mortvedt, Murphy, & Follet, ; Zhang, Li, Li, & Harris, ). At 93.1 to 192 mg kg −1 , the available K in soils is regarded as low (<160 mg kg −1 ) or medium, whereas, typically in calcareous soils, available Mg (105–178 mg kg −1 ) is medium‐high and Ca (>9,000 mg kg −1 ) very high.…”

Section: Resultsmentioning

confidence: 99%

“…Under such conditions, phosphate reacts with Ca to form scantly soluble compounds (Mortvedt, Murphy, & Follet, 1999;Zhang, Li, Li, & Harris, 2014 (Puy et al, 2016). The rest of the samples contained In addition to these samples from Sectors 4 (T6) and 5 (T2), considerable effort was deployed to recover and study the valley in other contexts, such as the burial-ritual area referred to earlier.…”

Section: Archaeological Sequences and Paleoenvironmental Studiesmentioning

confidence: 99%

Agrarian landscapes in the Iberian Iron Age: Mountain communities and land use in southeastern Iberia

et al. 2018

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Agrarian landscapes are among the least understood features of first millennium B.C. societies in the western Mediterranean. Studies of such landscapes in the context of the Iberian Iron Age have been based essentially on the archeological record in places used for purposes other than farming, particularly settlements and areas reserved for burials and rituals, or on the identification of the possible use of fertilizers. Here we present a multiproxy analysis of an agrarian landscape based on geoarchaeological and paleoenvironmental studies in a mountainous region in southeastern Iberia. The findings confirmed the existence of farmland cultivated as early as the first millennium B.C. in the high Jutia Valley in the Spanish province of Albacete. These results suggest that coordinated analyses can be highly useful for identifying enduring agricultural practices, while contributing to a fuller understanding of western Mediterranean agrarian landscapes and their millenarian resilience, attributable to the coevolution of human communities and the environment.

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“…2:1 clays, which predominate with high calcium and carbonate contents generating high amounts of hydroxyl ions (OH -), and in consequence, solution shows an alkaline pH. Zhang, Li, Li & Harris (2014), indicated that, in soils with these chemical conditions, calcium and CaCO 3 contents are high. Kishchuk (2000), indicated that high pH of soil and the presence of CaCO 3, affect the availability and balance of several essential nutrients as phosphorus, boron, iron, manganese and zinc.…”

Section: ------------------------------------Clay -------------------mentioning

confidence: 99%

Particle size distribution by Bouyoucos in slightly alkaline soils from department of Cordoba, Colombia

2018

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The aim of this study was to evaluate the Bouyoucos method, at different stirring times and using two chemical dispersants, for particle size determination and distribution in slightly alkaline soils of Córdoba, Colombia. Eight soils were mechanically dispersed applying a slow stirring; 60 rpm with five stirring times as follows: 2, 4, 6, 10 and 16 hours and a control experiment at 0 h. Chemical dispersion of samples was performed using two dispersants: Calgon (0.058 molL -1 (NaPO 3 ) 6 + 0.075 molL -1 Na 2 CO 3 ) and a mixture of Calgon and 0.1 molL -1 Na 4 P 2 O 7 at pH 9.1, which was proposed by authors. In addition, particle size distribution was determined by Pipette method, which was used as reference method. Tests of means and regression models were performed for sand, silt and clay contents using SAS statistical software. According to the results, significant differences were not found between 10 and 16 h of stirring, therefore maximum state of dispersion had achieved at stirring time of 10 h. Content of sand fraction showed an exponential decreasing which can be described following model given by , with determination coefficients higher than 0.90. Clay fraction showed exponentially increasing behavior of first order given by with determination coefficients greater than 90%. Soil textural classification was performed by Bouyoucos method using the proposed dispersant at 10 h of stirring was 75% similar to that determined by Pipette method whereas for Calgon, was 62.5%.Keywords: Stirring, clay, sand, chemical dispersants, silt, texture, timing. ResumenEl objetivo de este estudio fue evaluar el método de Bouyoucos, a diferentes tiempos de agitación utilizando dos dispersantes químicos, para la determinación de la distribución de tamaño de partícula en suelos ligeramente alcalinos de Córdoba, Colombia. Para ello, ocho suelos fueron sometidos a un proceso de dispersión mecánica, que consistió en una agitación lenta, en un equipo tipo Wagner a 60 rpm con cinco tiempos de agitación 2, 4, 6, 10 y 16 horas y un testigo a 0 h. La dispersión química de las muestras se realizó utilizando dos dispersantes; Calgon ((NaPO 3 ) 6 0.058 M + Na 2 CO 3 0.075 M) y una mezcla compuesta de Calgon más pirofosfato ((NaPO 3 ) 6 + Na 2 CO 3 ) + (Na 4 P 2 O 7 )) 0.1 M a pH 9,1. Además, a las muestras se les determino la granulometría por el método de pipeta. Las pruebas de medias y modelos de regresión de los contenidos de arena, limo y arcilla fueron analizados usando el software estadístico SAS. De acuerdo a los resultados obtenidos, no se encontró diferencias significativas entre las 10 y 16 h de agitación, por lo tanto 10 h son suficientes para obtener un máximo estado de dispersión. El contenido de la fracción arena presentó un decrecimiento exponencial que siguió el modelo , con coeficientes de determinación superiores a 0.90. La fracción de arcilla presentó un comportamiento exponencial creciente de primer orden, con coeficientes de determinación mayores del 90%. La clasificación textural por Bouyoucus con el dispers...

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Phosphate minerals and solubility in native and agricultural calcareous soils

Cited by 42 publications

References 22 publications

In situ observation of localized, sub-mm scale changes of phosphorus biogeochemistry in the rhizosphere

In situ observation of localized, sub-mm scale changes of phosphorus biogeochemistry in the rhizosphere

Agrarian landscapes in the Iberian Iron Age: Mountain communities and land use in southeastern Iberia

Particle size distribution by Bouyoucos in slightly alkaline soils from department of Cordoba, Colombia

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