Impact of water source dynamics on dissolved reactive phosphorus loadings in heterogenous karst agroecosystems with phosphatic limestones

2021 ◽  
Author(s):  
C. Radcliff ◽  
W. Ford ◽  
S. Nazari ◽  
C. Shepard
Keyword(s):  
Water Source ◽  
Dissolved Reactive Phosphorus ◽  
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.

scholarly journals The Effectiveness and Feasibility of Using Ochre as a Soil Amendment to Sequester Dissolved Reactive Phosphorus in Runoff

2011 ◽  
Vol 223 (3) ◽  
pp. 1249-1261 ◽  
Author(s):  
Owen Fenton ◽  
Laura Kirwan ◽  
Daire Ó hUallacháin ◽  
Mark Gerard Healy
Keyword(s):  
Soil Amendment ◽  
Dissolved Reactive Phosphorus ◽  
Reactive Phosphorus

scholarly journals The Effect of High Temperature on the Growth Performance of Hybrid Tilapia Oreochromis niloticus X Oreochromis aureus Juveniles Reared in a Recycling System

2019 ◽  
pp. 1-8
Author(s):  
Ana Laura Ibáñez ◽  
Tanahiri Torres-Vázquez ◽  
Sergio Humberto Álvarez-Hernández
Keyword(s):  
Water Temperature ◽  
Growth Performance ◽  
Freshwater Ecosystems ◽  
Effect Of Temperature ◽  
Oreochromis Aureus ◽  
Temperature Growth ◽  
Growth And Survival ◽  
Final Weight ◽  
Dissolved Reactive Phosphorus ◽  
Reactive Phosphorus

Tilapia juveniles live in littoral regions of freshwater ecosystems which have temperatures that may reach critical values for growth, especially in face of the onslaught of climate change. This study analyzes the effect of temperature (25, 30, 35, 40°C) on the growth and survival of hybrid tilapia juveniles in a re-circulating system. Duplicate groups of 30 juveniles were stocked in 200 L tanks in a closed, re-circulating system. Automatic heaters were used to establish the water temperatures, commercial food was supplied at 5% of their weight as daily ration. Fish were weighed and measured at 15-day intervals for a period of 3 months. Water temperature and dissolved oxygen were monitored daily. Ammonia, nitrates and dissolved reactive phosphorus were monitored every third day. Fish responses were estimated through variations in length, weight and inter-circuli space of fish scales. Average initial and final weight and length, Specific growth rate (SGR), Fulton Index (FI), Length-weight relationship and survival were used to assess tilapia growth performance. Weight, length, SGR and FI were significantly affected (P < 0.05) by water temperature. Growth of the fish reared at 30oC was almost one third greater than that at 25°C and one sixth greater than that at 35°C. Except for fish reared at 40°C, the other treatments showed a positive allometric growth, with the better results recorded for the 30 and 35°C treatments. The fish reared at 40°C survived only two weeks while the survival rate of 98, 90 and 88.3% for 25, 30 and 35°C, respectively.

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