The Use of Polyacrylamide to Replace Carbon in the Determination Of‘olsen's’extractable Phosphate in Soil

Banderis, A.; Barter, D. H.; Henderson, Keri L. D.

doi:10.1111/j.1365-2389.1976.tb01977.x

Cited by 34 publications

(16 citation statements)

References 2 publications

(4 reference statements)

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“…Secondly, the exact procedures used by different laboratories for the same nominal method might be somewhat different (extraction time, soil-extractant ratio, filter paper quality, filtering time, etc.). For example, the Danish extraction method uses a slightly modified Olsen Method suggested by Banderis et al (1976) and described in detail in Sørensen & Bu¨low- Olsen (1994). Fotyma et al (2008) and Neyroud & Lischer (2003) have already identified this problem.…”

Section: P Fertilizer Methods In Europe 423mentioning

confidence: 99%

An overview of fertilizer‐P recommendations in Europe: soil testing, calibration and fertilizer recommendations

Jordan‐Meille

Rubæk

Ehlert

et al. 2012

Soil Use and Management

192

145

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The procedure for applying phosphorus (P) fertilizer to soil can be divided into three consecutive steps: (i) Measurement of soil‐P availability, (ii) calibration of the soil‐P fertility level and (iii) estimation of the recommended P dose. Information on each of these steps was obtained for 18 European countries and regions with the aim of comparing P fertilizer recommendation systems at the European scale. We collected information on P fertilizer recommendations through conventional or grey literature, and personal contacts with researchers, laboratories and advisory services. We found much variation between countries for each of the three steps: There are more than 10 soil‐P tests currently in use, apparent contradictions in the interpretation of soil‐P test values and more than 3‐fold differences in the P fertilizer recommendations for similar soil‐crop situations. This last result was confirmed by conducting a simple experimental inter‐laboratory comparison. Moreover, soil properties (pH, clay content) and crop species characteristics (P responsiveness) are used in some countries in the calibration and recommendation steps, but in different ways. However, there are also common characteristics: soil‐P availability is determined in all countries by extraction with chemical reagents and the calibration of the soil‐P test values, and the fertilizer recommendations are based on the results from empirical field trials. Moreover, the fertilizer recommendations are nearly all based on the amount of P exported in the crops. As long as rational scientific and theoretical backgrounds are lacking, there is no point in trying to synchronize the different chemical methods used. We therefore call for a mechanistic approach in which the processes involved in plant P nutrition are truly reproduced by a single standard method or simulated by sorption‐desorption models.

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Section: P Fertilizer Methods In Europe 423mentioning

confidence: 99%

An overview of fertilizer‐P recommendations in Europe: soil testing, calibration and fertilizer recommendations

Jordan‐Meille

Rubæk

Ehlert

et al. 2012

Soil Use and Management

192

145

View full text Add to dashboard Cite

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“…Concentrations of hydrolysable amino acids were determined for each fertilizer treatment on a composite HA sample pooled from HA extracted from the field replicates. (Watanabe & Olsen, 1965;Banderis et al, 1976).…”

Section: Humic Acid Characterizationmentioning

confidence: 99%

Conserved chemical properties of young humic acid fractions in tropical lowland soil under intensive irrigated rice cropping

Olk

Cassman

Mahieu

et al. 1998

European J Soil Science

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Increasing cropping intensity (i.e. number of crops per year) of irrigated rice seems to cause an accumulation of phenolic compounds in the soil organic matter (SOM). We have studied the chemical nature of SOM in a broad range of soil types at different sites with long‐term double‐ and triple‐crop irrigated rice trials. Accumulation of phenols, as measured by 13C nuclear magnetic resonance spectroscopy, was found in both the mobile humic acid (MHA) and calcium humate (CaHA) fractions at all sites, regardless of soil type, hydrology during the fallow, and with and without inorganic fertilizer or green manures. Although phenols accumulated consistently in MHA and CaHA, the C, N and hydrolysable amino acid concentrations, degree of humification and amounts of MHA and CaHA were significantly altered by crop management, and they varied from site to site. Our results are consistent with the hypothesis that the accumulation of phenols is a characteristic of the anaerobic, or nearly anaerobic, soil conditions that exist at the initial stages of SOM formation in submerged irrigated rice soils. By contrast, other SOM properties are additionally influenced by soil conditions that govern the degradation and turnover of existing SOM. The chemical properties of MHA and CaHA indicated that they are labile, and the quantities of these HA fractions were more sensitive to recent management than were total soil C or N.

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“…The Olsen method, as modified by Banderis et al (1976), was used for the extraction. The Murphy and Riley (1962) method of P determination was used, in which the concentration of the blue complex produced by the reduction (with ascorbic acid) of the phosphomolybdate formed when acid ammonium molybdate reacts with phosphate is measured by UV-visible spectrophotometry (Pye Unicam model SP6-550) at 880 nm.…”

Section: Phosphorus Availability Determinationsmentioning

confidence: 99%

Effect of wetting and drying on P availability in calcareous arid region soils

Rimmer

Hamad

Syers

1993

Arid Soil Research and Rehabilitation

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Laboratory incubation studies were carried out on four soils from the Gezira region of the Sudan to measure the effect of wetting and drying cycles, similar to those experienced by irrigated field soils, on P availability, as measured by the sodium bicarbonate (NaHCO 3 ) and resin extraction methods. These soils, which are of low P status, were used both with and without amendments of P. In general, for unamended soils, wetting and drying increased NaHCO 3 -extractable P compared to that from soils maintained dry and, for prolonged wetting and drying treatments, increased NaHCO 3 -extractable P compared to soils maintained for the same period at a constant water content. In contrast, resin extraction of unamended soils showed that the wetting and drying treatments decreased the extractability of P compared to soils maintained dry and there was no difference when wetting and drying was compared to constant moisture. For soils with P added, wetting and drying increased NaHCO 3 -extractable P compared to soils maintained moist; a similar effect was seen with resin P extraction, except that the differences were generally not significant. Thus, wetting and drying does increase P extractability in these arid region soils and NaHCO 3 extraction was more sensitive than resin extraction in measuring the effect.

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The Use of Polyacrylamide to Replace Carbon in the Determination Of‘olsen's’extractable Phosphate in Soil

Cited by 34 publications

References 2 publications

An overview of fertilizer‐P recommendations in Europe: soil testing, calibration and fertilizer recommendations

An overview of fertilizer‐P recommendations in Europe: soil testing, calibration and fertilizer recommendations

Conserved chemical properties of young humic acid fractions in tropical lowland soil under intensive irrigated rice cropping

Effect of wetting and drying on P availability in calcareous arid region soils

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