An Exploratory Method for Fractionation of Organic Phosphorus From Grassland Soils

Bowman, R. A.; Cole, C. V.

doi:10.1097/00010694-197802000-00006

Cited by 390 publications

(203 citation statements)

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“…As an estimate of plant-available phosphorus (P a ), P was extracted by resin bags (Dowex 1×8-50), which were placed for 16 h in a solution of 1 g soil material suspended in 30 ml of water (Sibbesen 1977;Bowman and Cole 1978;Agbenin and van Raij 2001). P was Fig.…”

Section: Soil Analysismentioning

confidence: 99%

Variability of indices of macronutrient availability in soils at different spatial scales along an elevation transect in tropical moist forests (NE Ecuador)

2010

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The availability of key plant nutrients may change with elevation in tropical mountains due to altitudinal gradients in temperature and moisture which affect pedogenesis and nutrient cycling. In a transect from upper lowland to montane forests in NE Ecuador, we tested the hypotheses that (1) the availability of P is low in low-elevation forests but increases upslope, while the availability of N is relatively high at low elevations but decreases with elevation, and (2) increasing amounts of calcium, magnesium and potassium are stored on top of the soil with progressive humus accumulation toward higher elevations, likely to improve nutrient availability. In each 20 plots in undisturbed natural forest at 500, 1000, 1500 and 2000 ma.s.l., we measured in situ N net mineralization and nitrification rate (N NM and N NI , buried bag method), plant-available phosphorus (P a , resin-bag method), and salt-exchangeable calcium, potassium and magnesium concentrations (Ca ex , K ex , Mg ex ) in the organic and mineral topsoils. N NM and N NI , and the Ca ex , K ex and Mg ex concentrations were much more variable at the plot level than across the four elevations, while P a varied equally at small and large spatial scales. P a increased more than 10fold from 500 to 2000 m. The net release of nitrate dominated over ammonium at all elevations. While mass-related N NM and N NI rates and also organic matter C/N ratio in the topsoil remained invariant along the slope, N NM and N NI rates per ground area decreased by about 40% from 500 to 2000 m. Thus, the N NM /P a ratio decreased markedly with elevation proving our first hypothesis. In support of the second hypothesis, the pools of Ca ex , Mg ex and K ex in the organic layers increased with elevation, demonstrating the key role that organic topsoil horizons are playing for forest nutrition at high elevations. We suggest that the large difference in N versus P availability of tropical (upper) lowland and montane forests is likely to be a key factor influencing the species composition and productivity along tropical mountain slopes.

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Section: Soil Analysismentioning

confidence: 99%

Variability of indices of macronutrient availability in soils at different spatial scales along an elevation transect in tropical moist forests (NE Ecuador)

2010

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“…Several investigators showed that continuous application of phosphorus (P) fertilizer tends to increase the inorganic (Pi) and organic P (Po) levels in the soil (Ball-Coelho, Salcedo, Tiessen & Stewart, 1993;Condron & Goh, 1989;Bowman & Cole, 1978). Eloff (1971) and Sadler and Stewart (1975) stated that between 70-95% of the applied P fertilizer remaining in the soil after harvesting of a crop, is readily available to succeeding crops.…”

Section: Introductionmentioning

confidence: 99%

Changes in inorganic and organic Phosphorus in soil under maize (Zea mays) cultivation

Preez

Claassens

1999

South African Journal of Plant and Soil

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The changes in applied and residual phosphorus (P) were examined in Avalon and Clovelly soils under cultivation by using the P fractionation method of Hedley, Stewart and Chauhan (1982). Soil P was separated into six major fractions of which some fractions were subdivided into organic (Po) and inorganic (Pi) P forms: P extracted by an anion exchange resin (Resin-P); 0.5 M NaHCOTP (NaHC0 3 -Pi and Po); 0.1 M NaOH (NaOH-IPi and Po); ultrasonication in 0.1 M NaOH at 75 watt (NaOH-Il-Pi and Po); 1.0 M HCI (HCI-Pi); and H 2 S0 4 digestion and H 2 0 2 oxidation, (H 2 S0 4 P). General trends in soil P were evident over 15 years of cultivation. Resin-P, NaHC0 3 -Pi, NaOH-I-Pi, NaOH-Il-Pi and HCI-Pi were reduced in the Avalon soil, while only the NaHC0 3 -Pi and NaOH-Il-Pi decreased in the Clovelly soil. It is hypothesised that NaOH-I-Pi, which showed the largest decrease, was mainly responsible for the replenishment of the labile P pool. In the Po fraction, NaHC0 3 -Po and NaOH-Il-Po decreased with time in the Avalon soil, in contrast to NaOH-I-Po that stayed constant in both soils. H 2 S0 4 -P decreased with time in the Avalon soil, but increased in the Clovelly soil. The increase in H 2 S0 4 -P in the latter probably resulted from the mobilization of unextracted (ca. 13.5% of total P) soil P.In 'n langtermyn mielieproef is 'n fosforfraksioneringsmetode (Hedley, Stewart & Chauhan, 1982) gebruik om die verandering van toegediende en residuele P in 'n Avalon en Clovelly grond te ondersoek. Grond P is in ses fraksies verdeel waarna van die fraksies verder verdeel is in organiese (Po) en anorganies P (Pa) naamlik; P geekstraheer met anioonuitruilhars (Hars-P); 0.5 M NaHC0 3 (NaHC0 3 -Pa en Po); 0.1 M NaOH (NaOH-I-Pa en Po); NaOH met ultrasonikasie by 75 watt (NaOH-Il-Pa en Po); 1 M HCI (HCI-Pa), en H 2 S0 4 met H 2 0 2 vertering (H 2 S0 4 -P). 'n Afname in hars-P, NaHC0 3 -Pa , NaOH-I-Pa, NaOH-Il-Pa en HCI-Pa het oor tyd voorgekom in die Avalon grond. Die NaOH-I-Pa fraksie was waarskynlik verantwoordelik vir die aanvulling van die labiele P. NaOH-I-Pa het toegeneem oor 15 jaar van bewerking terwyl NaHC0 3 -Pa en NaOH-I-Pa oor tyd afgeneem het in die Clovelly grond. H 2 S0 4 -P het 'n afnemende tendens in die Avalon en in die Clovelly grond 'n toenemende tendens oor tyd getoon. Die toename in H 2 S0 4 -P in laasgenoemde is waarskynlik as gevolg van die mobilisasie van die gedeelte (ca.13.5% P) van die totale grond-P wat nie deur die fraksioneringsmetode geekstraheer is nie.

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“…Labile P fractions (extraction with 0.5 mol L -1 sodium bicarbonate, pH 8.5) were determined according to Bowman and Cole (1978) as modified by Duda (2000). Briefly, P fractionation was performed through sequential P extraction, using the same soil sample.…”

Section: Methodsmentioning

confidence: 99%

“…The use of the Bowman and Cole (1978) and Bowman (1989) methods for extraction of inorganic (Pi) and organic phosphorus (Po) has been proposed by several authors (PARTELLI et al, 2009;BEUTLER, 2012;DUDA et al, 2013;OLIVEIRA et al, 2014;BEUTLER et al, 2015;BEZERRA et al, 2015). These methods allow the extraction of labile, moderately labile, moderately recalcitrant, and recalcitrant P fractions, using different extractors (NaHCO 3 , NaOH, and H 2 SO 4 ), therefore separating soil P into fractions of different plant availability.…”

Section: Introductionmentioning

confidence: 99%

“…NaHCO 3 extracts labile Pi and Po fractions, which have higher availability to plants (GATIBONI et al, 2007;GONÇALVES;MEURER, 2009). P fractions obtained through acid extraction (1.79 mol L -1 H 2 SO 4 ) are considered moderately labile (BOWMAN;COLE, 1978), and through alkaline extraction (NaOH), moderately recalcitrant (BOWMAN;COLE, 1978).…”

Section: Introductionmentioning

confidence: 99%

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Phosphorus fractions and correlation with soil attributes in a chronosequence of agricultural under no-tillage

Rosset

Guareschi

Pinto

et al. 2016

SCA

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In no-tillage (NT) soils, changes in the quantity and quality of soil organic matter (SOM) have been observed over time. These changes can interfere with the dynamics of P in surface soil layers. Thus, the objectives of this study were: to evaluate the organic and inorganic fractions of P and their degree of lability (labile, moderately labile, and moderately recalcitrant) in an Oxisol under NT for 6 years (NT 6 ), 14 years (NT 14 ), and 22 years (NT 22 ) and cultivated with a succession of soybean and corn/wheat. The fractions were evaluated for 16 years of NT, with the last four years under integrated corn second crop and Brachiaria (NT 16+B ). We also analyzed an area of native forest, as well as analyzing the correlations between the results of the P fractions of these areas with other attributes such as total carbon content, vegetable waste deposited on the ground, phosphorus and humic fractions remaining in SOM. ResumoEm solos sob sistema de plantio direto (SPD) tem sido observado alterações na quantidade e qualidade da matéria orgânica do solo (MOS) ao longo do tempo, o que pode interferir na dinâmica do P nas camadas superficiais do solo. Dessa forma, os objetivos deste estudo foram: avaliar as frações inorgânicas e orgânicas de P e o grau de labilidade destas (lábil, moderamente lábil e moderadamente resistente) de um Latossolo Vermelho eutroférrico sob sistema de plantio direto (SPD) com 6 anos (SPD 6 anos (SPD 14 ) e 22 anos (SPD 22 ) na sucessão soja, milho/trigo; 16 anos de SPD, sendo nos últimos quatro anos com integração milho segunda safra e Urochloa (SPD 16+B ) e uma área de mata nativa; e analisar correlações entre os resultados das frações de P dessas áreas com outros atributos, tais como, carbono total, resíduos vegetais depositados sobre o solo, fósforo remanescente e frações húmicas da MOS. Em cada uma das áreas foram coletadas amostras nas camadas de 0,00-0,05 m e 0,05-0,10 m. O delineamento utilizado foi inteiramente casualizado, com 5 repetições. O manejo da adubação fosfatada e da MOS em função do tempo de adoção do SPD (6 para 22 anos) aumentou os teores de todas as frações de P inorgânico (0,0-0,10 m), bem como, as frações de fósforo orgânico lábil (0,05-0,10 m), moderadamente lábil (0,0-0,10 m) e moderadamente resistente (0,05-0,10 m). Através da matriz de correlação podem-se verificar interações entre os atributos do solo avaliados, principalmente entre as frações de fósforo inorgânico e os ácidos fúlvicos e húmicos, e entre o fósforo orgânico moderadamente resistente e a fração humina. Palavras-chave: Latossolo Vermelho. Fósforo orgânico. Adsorção de fósforo. Matéria orgânica do solo.

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An Exploratory Method for Fractionation of Organic Phosphorus From Grassland Soils

Cited by 390 publications

References 0 publications

Variability of indices of macronutrient availability in soils at different spatial scales along an elevation transect in tropical moist forests (NE Ecuador)

Variability of indices of macronutrient availability in soils at different spatial scales along an elevation transect in tropical moist forests (NE Ecuador)

Changes in inorganic and organic Phosphorus in soil under maize (Zea mays) cultivation

Phosphorus fractions and correlation with soil attributes in a chronosequence of agricultural under no-tillage

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