A low cost method to estimate dissolved reactive phosphorus loads of rivers and streams

2007 ◽  
Vol 9 (1) ◽  
pp. 82-86 ◽  
Author(s):  
Beat Müller ◽  
Arno Stöckli ◽  
Ruth Stierli ◽  
Ernst Butscher ◽  
René Gächter
Keyword(s):  
Low Cost ◽  
Rivers And Streams ◽  
Dissolved Reactive Phosphorus ◽  
Phosphorus Loads ◽  
Reactive Phosphorus

scholarly journals High-Resolution Profiles of Dissolved Reactive Phosphorus in the Porewaters of Lake Sediments Assessed by DGT Technique

2014 ◽  
Vol 05 (08) ◽  
pp. 694-702
Author(s):  
Jian Wang ◽  
Jingtian Zhang ◽  
Qiong Xie ◽  
Fengyu Zan ◽  
Shengpeng Zuo ◽  
...  
Keyword(s):  
High Resolution ◽  
Lake Sediments ◽  
Dissolved Reactive Phosphorus ◽  
Reactive Phosphorus

scholarly journals Poultry Litter Ash Rate and Placement Affect Phosphorus Dissolution in a Horticultural Substrate1

2017 ◽  
Vol 35 (3) ◽  
pp. 117-127
Author(s):  
Daniel E. Wells ◽  
Jeffrey S. Beasley ◽  
Edward W. Bush ◽  
Lewis. A. Gaston
Keyword(s):  
Crop Production ◽  
Poultry Litter ◽  
Lantana Camara ◽  
Shoot Biomass ◽  
Horticultural Crops ◽  
P Loss ◽  
P Rate ◽  
Dissolved Reactive Phosphorus ◽  
Reactive Phosphorus ◽  
Poultry Litter Ash

Abstract Poultry litter ash (PLA) is a byproduct of bioenergy production and an effective P source for horticultural crops since it reduces P losses from container production due to its low P solubility. Experiments were conducted to determine effects of rate and placement of PLA on P loss from greenhouse crop production and growth and quality of two commonly-grown greenhouse crops, Verbena canadensis Britton ‘Homestead Purple' and Lantana camara L. ‘New Gold', by comparing two rates (140 and 280 g·m−3 P or 0.4 and 0.8 lb·yd−3) and two application methods (post-plant topdressed and pre-plant incorporated). Leachate-dissolved reactive phosphorus (DRP) concentrations were reduced by an average of 24% as P rate was reduced from 280 to 140 g·m−3, but were 134% less on average when PLA was topdressed instead of incorporated. Foliar P concentrations were less 33% and 44% for verbena and lantana, respectively when plants were topdressed compared to incorporated. Shoot biomass of verbena and lantana was 9% and 24% greater, respectively, when incorporating instead of topdressing PLA. As a P source, PLA should be pre-plant incorporated within the substrate at a total P rate between 140 g·m−3 (0.4 lb·yd−3) and 280 g·m−3 (0.8 lb·yd−3). Index words: phosphorus, poultry litter ash, Verbena canadensis Britton ‘Homestead Purple', Lantana camara L. ‘New Gold', dissolved reactive phosphorus. Species used in this study: ‘Homestead Purple' verbena (Verbena canadensis Britton); ‘New Gold' lantana (Lantana camara L.).

Continuous Flow Analysis Method for Determination of Dissolved Reactive Phosphorus in Ice Cores

2013 ◽  
Vol 47 (21) ◽  
pp. 12325-12332 ◽  
Author(s):  
Helle Astrid Kjær ◽  
Paul Vallelonga ◽  
Anders Svensson ◽  
Magnus Elleskov L. Kristensen ◽  
Catalin Tibuleac ◽  
...  
Keyword(s):  
Continuous Flow ◽  
Flow Analysis ◽  
Ice Cores ◽  
Analysis Method ◽  
Continuous Flow Analysis ◽  
Dissolved Reactive Phosphorus ◽  
Reactive Phosphorus

Limnological properties of Antarctic ponds during winter freezing

1991 ◽  
Vol 3 (4) ◽  
pp. 379-388 ◽  
Author(s):  
S. Schmidt ◽  
W. Moskal ◽  
S. J. De Mora ◽  
C. Howard-Williams ◽  
W. F. Vincent
Keyword(s):  
Respiratory Activity ◽  
Sodium Sulphate ◽  
Organic N ◽  
Nitrogen Species ◽  
Dissolved Reactive Phosphorus ◽  
Bottom Waters ◽  
Shallow Ponds ◽  
Reactive Phosphorus ◽  
Chemical Conditions ◽  
Physical And Chemical

Two shallow ponds at Cape Evans, Ross Island, were sampled at 1–2 week intervals, during winter freezing throughout the winter and during the subsequent melt period, to examine the physical and chemical conditions imposed on the biota during the year. Liquid water was first detected at the base of the ponds in late December. During the main summer melt period conductivities were less than 10 mS cm−1 with maximum daily temperatures around 5°C. The bottom waters became increasingly saline during freezing and water temperatures decreased below 0°C; by June the remaining water overlying the sediments had conductivities >150 mS cm−1 and temperatures of −13°C. Calcium carbonate, then sodium sulphate precipitated out of solution during early freezing. The dominant nitrogen species was dissolved organic-N which reached 12 g m−3 in Pond 1 just prior to final freeze up. The organic and inorganic forms of nitrogen and dissolved reactive phosphorus increased with increasing conductivity in the ponds. The behaviour of particulate-N and particulate-P mirrored that of chlorophyll a with a peak in March-April and a second higher peak just before final freeze-up. This study provides clear evidence that organisms which persist throughout the year in Antarctic coastal ponds must be capable of surviving much more severe osmotic, pH, temperature and redox conditions than those measured during the summer melt. Deoxygenation, pH decline and H2S production, however, point to continued respiratory activity well into the dark winter months.

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