Topic
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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TL;DR: In this paper, a large-scale monolith lysimeters (135 cm deep, 80 cm diam) installed in a field site in southwest England was used to monitor P in leachate draining through large scale monolith LBSs.
Abstract: The transfer of P in water draining from agricultural land can contribute to eutrophication and the growth of toxic algae. Traditionally, research has focused on particulate P transfer in surface pathways, with transfer by subsurface pathways perceived as negligible. We investigated this by monitoring P in leachate draining through large-scale monolith lysimeters (135 cm deep, 80 cm diam.) installed in a field site in southwest England. The lysimeters were taken from four grassland soil types with a range of textures (silty clay-sand) and extractable-P contents (15-75 mg kg -1 NaHCO 3 extractable P) and leachate was sampled over two drainage seasons. Export of total P was 200 μg L -1 were detected from all soil types. Physically, most of the leachate P was dissolved ( 0.45 μm) size fraction, most notably from the sandy-textured soils. Chemically, the leachate was dominated by reactive (inorganic) P from all soil types (62-71%), although a large proportion was in unreactive (organic) P forms (29-38%). Reactive P occurred mainly in the 0.45 fraction. Unreactive P in the 0.45 μm P forms are important in subsurface P transfer.
196 citations
TL;DR: In this paper, an aerated filter with seeded expanded shale and an anoxic filter packed with plastic media, were operated using settled sewage feed, and iron (II) sulphate heptahydrate solution was dosed onto the top of the filter at varying ratios of total phosphorus to iron.
196 citations
TL;DR: In this article, the authors found that the organic acids secreted by these PSBs were 20-50 times less than that required to solubilize phosphorus from alkaline soil.
Abstract: Native microflora present in the alkaline vertisols and two phosphate-solubilizing bacteria (PSB) isolated from soil using conventional screening media could not release phosphorus from alkaline Indian vertisol soils supplemented with carbon and nitrogen sources. The two PSBs could solubilize both rock phosphate and di-calcium phosphate in unbuffered media but failed to solubilize rock phosphate in buffered media. The organic acids secreted by these PSBs were 20-50 times less than that required to solubilize phosphorus from alkaline soil.
196 citations
TL;DR: The chemical interaction between soil organic matter and the orthophosphate anion (phosphate [P]) is important for reactions of P at the soil solid phase, in soil solution, and in natural waters.
Abstract: The chemical interaction between soil organic matter and the orthophosphate anion (phosphate [P]) is important for reactions of P at the soil solid phase, in soil solution, and in natural waters. Humic substances account for an important or dominant part of soil organic matter and of dissolv
196 citations