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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.


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Journal ArticleDOI
TL;DR: In this paper, the relationship between phosphorus retention and several other lake and watershed parameters was examined for 15 lakes and a model relating the areal water load (qs) to phosphorus retention was proposed:Rp = 0.426 exp (−0.271qs) + 0.574 exp (− 0.00949qs).
Abstract: The relationship between phosphorus retention and several other lake and watershed parameters was examined for 15 lakes. A model relating the areal water load (qs) to phosphorus retention was proposed:Rp = 0.426 exp (−0.271qs) + 0.574 exp (−0.00949qs). This model was found to be theoretically sound, and the predicted and measured values were in close agreement (r = 0.94).

202 citations

Journal ArticleDOI
TL;DR: Phosphorus fluxes were measured in a marine fish cage farm in the Gullmar Fjord, western Sweden, based on seasonal input of fish food and juveniles, sedimentation and removal by harvest, fish loss and benthic fluxes.
Abstract: Phosphorus fluxes were measured in a marine fish cage farm in the Gullmar Fjord, western Sweden. The measured fluxes included fish food, juveniles, harvest, fish loss (dead fish and escapers), sedimentation from the cages and benthic solute release (in situ). Two different types of mass balances were constructed. The flux method was based on seasonal input of fish food and juveniles, sedimentation and removal by harvest, fish loss and benthic fluxes Mass balances according to the flux method were constructed for each of 2 consecutive growing seasons The accumulat~on method was based on total input of phosphorus through fish food and juveniles, removal by harvest and fish loss, and net accumulation in the sedmen t over 7 growing seasons. Both types of mass balances gave similar results. Of the total phosphorus input to the farm, 17 to 19 % was recovered in harvest, fish loss constituted 1 to 4 %, and 78 to 82 % was lost to the environment. The environmental loss of phosphorus for each ton of fish produced was 22.4 kg (1985), 19.6 kg (1986) and 21.9 kg (1980 to 1986). Of the loss to the environment, 34 to 41 O/ O was in dissolved form and 59 to 66 % was accumulated in the sediment. O n a seasonal basis, the benthic flux transferred 4 to 8 % of the sedimented phosphorus back to the overlying water This constituted about 1 O/o of the total phosphorus content in the sediment derived from the fish farm.

202 citations

Journal ArticleDOI
G-Yull Rhee1
TL;DR: Algal growth was severely limited in the presence of bacteria, but the growth of bacteria was hardly affected by algae, and the faster growth rate of bacteria accounted for the suppressed growth of the algae in the mixed cultures.
Abstract: Competition for phosphate was studied in Scenedesmus sp. and Pseudomonas sp. grown in pure and mixed cultures. Algal growth was severely limited in the presence of bacteria, but the growth of bacteria was hardly affected by algae. The first sign of competition in mixed cultures (cessation of exponential algal growth) was always observed some time after the external phosphate had been exhausted. The faster growth rate of bacteria accounted for the suppressed growth of the algae in the mixed cultures. The first sign of competition in algae appeared when the concentration of surplus phosphorus within the algal cell dropped to a critical value near zero. The surplus phosphorus appeared to consist of three or all four inorganic polyphosphate fractions.

202 citations

Journal ArticleDOI
TL;DR: The influence of the amount and kinds of organic and inorganic amendments on phosphorus (P) sorption characteristics was determined on two soils from Oregon, Jory (Xeric Haplohumult) and Tolo (Typic Vitrandept), and three soils from Rwanda, Mata (Sombrihumult), Kibeho (Paleudult), and Kinigi as mentioned in this paper.
Abstract: The influence of the amount and kinds of organic and inorganic amendments on phosphorus (P) sorption characteristics was determined on two soils from Oregon, Jory (Xeric Haplohumult) and Tolo (Typic Vitrandept), and three soils from Rwanda, Mata (Sombrihumult), Kibeho (Paleudult), and Kinigi (Typic

201 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