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Phosphorus

About: Phosphorus is a research topic. Over the lifetime, 53120 publications have been published within this topic receiving 939731 citations. The topic is also known as: element 15 & P.


Papers
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Journal ArticleDOI
TL;DR: In this paper, the authors studied the forms and pathways of phosphorus movement from soil to water using 1-ha plot lysimeters, managed as grazed grassland for 12 months in temperate South-west England.
Abstract: Phosphorus (P) from soil can impair the water quality of streams and lakes. We have studied the forms and pathways of its movement from soil to water using 1-ha plot lysimeters, managed as grazed grassland for 12 months in temperate South-west England. The water flow through three pathways, namely (i) surface plus interflow to 30 cm (on undrained soil), (ii) surface plus interflow to 30 cm (on a mole and tile drained soil), and (iii) mole and tile drains (to 85 cm), were gauged. Samples of water from each path were treated with various combinations of 0.45-mu m filtration and sulphuric acid-persulphate digestion and molybdate reaction, to determine the different forms of P. The total P (TP) concentration was greatest in the surface plus interflow to 30 cm paths (means 232 and 152 mu g l(-1)), whereas the mean concentration in the drainage to 85 cm was 132 mu g l(-1). This reflects the substantial enrichment of the Olsen-P extracts from the surface horizons, as extracts from the 0-2 cm layer were 10-fold more than below 45 cm. In all paths, the dissolved P comprised the greatest proportion of the P transferred, with dissolved reactive P being the dominant form. Draining land reduced the transfer of TP by about 30% (approximate to 1 kg(-1) ha(-1) year(-1)), because it can be sorbed as it flows through soil to drains. All these concentrations could cause eutrophication in surface waters.

306 citations

Book
01 Jan 1974

305 citations

Journal ArticleDOI
TL;DR: Analysis of literature data from lakes worldwide showed significant relationships between the release rates and total sediment P and citrate dithionite bicarbonate extractable P and reductant-soluble P.
Abstract: Release rates of phosphorus from anoxic sediment surfaces in seven North American lakes were determined from core tube incubations. These rates were compared with several P fractions within the 0–5...

304 citations

Book ChapterDOI
TL;DR: In this paper, the authors describe the special soil conditions that exist because of waterlogging and discuss the effect of these conditions on the transformation and availability of nitrogen and phosphorus in lowland rice.
Abstract: Publisher Summary This chapter describes the special soil conditions that exist because of waterlogging and discusses the effect of these conditions on the transformation and availability of nitrogen and phosphorus. Waterlogging causes changes in the properties of soils, which profoundly affect the nutrition of lowland rice. The root zone is changed from an aerobic to an anaerobic or near-anaerobic environment because of the drastic decrease in the oxygen supply in the soil. Oxidation–reduction systems in the soil, which are generally stable as long as the soil is bathed in oxygen, become unstable when the oxygen supply is restricted. Nitrate, manganic compounds, ferric compounds, and sulfate are stable in well-aerated soils but become unstable when the oxygen supply of the soil is cut off. Nitrate nitrogen is subjected to loss through denitrification because of the ability of facultative anaerobes to substitute nitrate for oxygen. Manganous manganese and ferrous iron are produced from the oxidized compounds of these elements under waterlogged conditions. If reduction is intense enough, sulfate is reduced to sulfide by anaerobic bacteria. Both nitrate and ammonium ions can be assimilated by the rice plant, but better stability of the ammonium form in waterlogged soils make it the superior form of nitrogen for lowland rice. Advantage can be taken from the reducing conditions in waterlogged soils to increase the utilization of nitrogen fertilizer. Several forms of phosphate that are coprecipitated with ferric oxide are released as a result of the reduction of ferric oxide in the soil. These reactions usually result in a larger amount of phosphate becoming available to a flooded rice crop than would be the case with an upland crop.

303 citations

Journal ArticleDOI
TL;DR: In this article, the stable yellow colour complex developed when an excess of a molybdate solution is added to an acidified solution of a vanadate and an orthophosphate; all three reagents required can be used in a composite solution.
Abstract: This rapid method makes use of the stable yellow colour complex developed when an excess of a molybdate solution is added to an acidified solution of a vanadate and an orthophosphate; all three reagents required can be used in a composite solution. Details for the determination of water-soluble and total phosphate are given using the Spekker photoelectric absorptiometer. Results agree within 2.5% of those obtained by the standard gravimetric method, those on nine fertilizers being given.

303 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
20242
20232,479
20225,004
20211,546
20201,644
20191,746