Dissolved and particulate phosphorus concentration and export patterns in headwater streams draining Boreal Plain watersheds one year after experimental forest harvest and post-harvest silvicultural activities

2008 ◽  
Vol 7 (Supplement 1) ◽  
pp. 63-77 ◽  
Author(s):  
Ellie E. Prepas ◽  
Janice M. Burke ◽  
Gordon Putz ◽  
Daniel W. Smith
Keyword(s):  
Headwater Streams ◽  
Particulate Phosphorus ◽  
Phosphorus Concentration ◽  
Forest Harvest ◽  
Post Harvest ◽  
One Year

The Everglades Nutrient Removal Project test cells: STA optimization - status of the research at the north site

2001 ◽  
Vol 44 (11-12) ◽  
pp. 117-122 ◽  
Author(s):  
J. Majer Newman ◽  
T. Lynch
Keyword(s):  
Nutrient Removal ◽  
Organic Phosphorus ◽  
Inorganic Compounds ◽  
Monitoring Program ◽  
South Florida ◽  
Particulate Phosphorus ◽  
Phosphorus Concentration ◽  
The North ◽  
Test Cells ◽  
Oligotrophic Ecosystem

The Everglades is an oligotrophic ecosystem that is being adversely impacted by hydrologic changes and nutrient-rich runoff generated from urban and agricultural sources. The Stormwater Treatment Area (STA) Optimization Research and Monitoring program is mandated by the 1994 Everglades Forever Act and will assist the South Florida Water Management District in developing operational strategies that maximize performance of emergent macrophyte STAs. The primary objective of this research is to examine how hydrologic conditions may influence STA performance. The study was conducted in 0.2 ha, shallow, fully lined test cells located within the perimeter of the Everglades Nutrient Removal Project. Experiments were designed to examine the effect of increased and decreased hydraulic loading rate (HLR) on wetland performance and to determine, if possible, the HLR at which STA treatment fails to reduce outflow total phosphorus concentration to the interim target of 50 μg-P/L. To date, two HLR experiments have been completed at the north site. Preliminary data indicated at all HLRs tested that particulate phosphorus and dissolved organic phosphorus ratios remained virtually unchanged from inflow to outflow. The dissolved organic and particulate compounds within these test cells are extremely recalcitrant, and are not easily assimilated within the system. High HLRs may not result in detention times long enough to mineralize these forms into easily assimilated inorganic compounds, resulting in mean TP concentrations greater than 50 μg-P/L.

scholarly journals Mehlich 3 extractant used for the evaluation of wheat-available phosphorus and zinc in calcareous soils

2018 ◽  
Vol 64 (No. 2) ◽  
pp. 53-57 ◽  
Author(s):  
Sedlář Ondřej ◽  
Balík Jiří ◽  
Kulhánek Martin ◽  
Černý Jindřich ◽  
Kos Milan
Keyword(s):  
Stem Elongation ◽  
Phosphorus Deficiency ◽  
Calcareous Soils ◽  
Phosphorus Nutrition ◽  
Shoot Biomass ◽  
Phosphorus Concentration ◽  
Available Phosphorus ◽  
Nitrogen Concentrations ◽  
One Year ◽  
Index Ratio

Relation between wheat (Triticum aestivum) nutritional status determined at the beginning of stem elongation and during anthesis, respectively, and available content of phosphorus (P-M3) and zinc (Zn-M3) determined by the Mehlich 3 extractant was studied. Both one-year pot experiment with spring wheat and two-year on-farm trials with winter wheat were run on various calcareous soils (pH values of 7.18–7.94, median 7.80, P-M3 1–289 ppm, median 54, and Zn-M3 2–14 ppm, median 4), in the Czech Republic (Central Europe). Phosphorus nutrition index (ratio of phosphorus concentration in shoot biomass to critical phosphorus concentration – P<sub>c</sub>) was calculated using the Belanger et al.’s model: P<sub>c</sub> = –0.677 + 0.221N – 0.00292N(2), where both phosphorus and nitrogen concentrations were expressed in g/kg shoot dry matter. Unlike phosphorus concentration in shoot biomass, phosphorus nutrition index significantly correlated with P-M3 content in soil. Optimal values of the phosphorus nutrition index were recorded if P-M3 was 51–68 ppm. Zinc concentration in shoot biomass more strongly correlated with P:Zn ratio (M3) in soil compared to Zn-M3 content in soil. P:Zn ratio in shoot biomass of 130:1 did not lead to phosphorus deficiency and corresponded to P:Zn (M3) ratio in soil of 9.3:1–14.3:1.

Particulate Phosphorus Dynamics in Headwater Streams

1988 ◽  
Vol 45 (2) ◽  
pp. 210-215 ◽  
Author(s):  
Yves T. Prairie ◽  
Jacob Kalff
Keyword(s):  
Predictive Power ◽  
Forest Cover ◽  
Headwater Streams ◽  
Particulate Phosphorus ◽  
Stream Channel ◽  
Slope Coefficient ◽  
Temporal Fluctuations ◽  
Phosphorus Dynamics ◽  
Catchment Size ◽  
Rain Events

We examined the dynamics of particulate phosphorus (PP) in seven headwater streams of southern Quebec draining catchments differing in size, extent of forest cover, and stream channel gradient. The extent of forest cover can be used to predict average [PP]. The magnitude of the temporal fluctuations (variance) in [PP] was strongly related to mean levels. While most streams showed positive relationships between discharge and [PP] in rain events, inverse relations were observed in two streams and possibly the result of the rapid exhaustion of PP. Inverse relationships were also seen in these two streams for samples collected outside rain events. We present a model based on channel gradient and extent of forest cover to predict the slope coefficient of [PP]–discharge relationships and also the occurrence of very rapid exhaustion. We then extend this model to include the influence of precipitation history and catchment size on [PP] in headwater streams. This model accounted for 60% of the variation of the pooled observations from all seven streams and is comparable in predictive power with stream-specific models published elsewhere in the literature.

Simulation of the Contribution of Phosphorus-Containing Minerogenic Particles to Particulate Phosphorus Concentration in Cayuga Lake, New York

2016 ◽  
Vol 227 (11) ◽  
Author(s):  
Rakesh K. Gelda ◽  
Steven W. Effler ◽  
Anthony R. Prestigiacomo ◽  
Feng Peng ◽  
Martin T. Auer ◽  
...  
Keyword(s):  
New York ◽  
Particulate Phosphorus ◽  
Phosphorus Concentration ◽  
Cayuga Lake ◽  
Phosphorus Containing ◽  
Minerogenic Particles

scholarly journals WATER QUALITY ASSESSMENT OF PUNASA DAM (INDIRA SAGAR DAM), MADHYA PRADESH

2021 ◽  
Vol 9 (02) ◽  
pp. 501-508
Author(s):  
Heena Saraswat ◽  
◽  
Meenakshi Solanki ◽  
Keyword(s):  
Water Quality ◽  
Chemical Properties ◽  
Oxygen Demand ◽  
Water Quality Assessment ◽  
Madhya Pradesh ◽  
Phosphorus Concentration ◽  
Quality Guidelines ◽  
The Status ◽  
One Year ◽  
Physical And Chemical

The Indirasagar Dam (Punasa Dam) is a multipurpose key project of Madhya Pradesh on the Narmada river at Narmada Nagar in Khandwa (Tehsil of West Nimar district) Madhya Pradesh in India.The physical and chemical properties of water including temperature, pH, transparency, dissolved oxygen, biological oxygen demand, hardness, nitrate, calcium and phosphorus concentration, were monitored from October 2018 to September 2019. The physical and chemical parameters were analyzed as per APHA, revealed that there were fewer variations in the physicochemical parameters and results received through the entire one year of study showed that the status of water quality is quite normal and within the permissible limit as mentioned with ISI.Moreover, according to the findings of this research and their comparison with the national and international water quality guidelines/standards, it could be said that the water quality of Punasa dam during the study period was acceptable. However, due to the changes occurred in nitrate and phosphorus and extensive development of eutrophication problem, accurate and continuous evaluation of water quality in this reservoir is deemed necessary.

Seasonal changes in chemical composition of heavily fertilized Kikuyu pasture and their potential effects on the mineral nutrition of grazing cattle

1979 ◽  
Vol 19 (97) ◽  
pp. 183 ◽  
Author(s):  
AS Awad ◽  
DG Edwards ◽  
DO Huett
Keyword(s):  
Nitrogen Concentration ◽  
Nutrient Content ◽  
Early Summer ◽  
Phosphorus Concentration ◽  
Late Winter ◽  
Grazing Cattle ◽  
Nitrogen Concentrations ◽  
One Year ◽  
High Level ◽  
Phosphorus Application

was sampled at two week intervals over a period of one year. The concentrations of calcium throughout the year (0.15-0.28%) and phosphorus from late winter to early summer (0.20-0.28%) were well below the values normally considered to be required by milking cows and some classes of beef cattle. The nitrogen concentrations reached minimal values of 1.8-2.2% in winter, which appear to be adequate for milk production. From summer through to the end of winter, the ratio of K/(Ca + Mg) was much higher, and the Ca/P ratio was much lower, than those values reported to be associated with the occurrence of grass tetany in grazing cattle. Very high nitrogen concentratians in early summer (up to 5.2% N where 672 kg N ha-1 year-1 was applied) were in the range that has been associated with grass tetany in cattle. Lime application increased the nitrogen, phosphorus and calcium concentrations in the herbage throughout the year. The effect of lime in increasing nitrogen concentration in the herbage was maximal in late autumn and winter, at which time fertilizer nitrogen had little or no effect. The increased nitrogen concentration in the herbage through application of lime was associated with the development of a naturalized white clover component in the sward. Lime also increased the phosphorus concentration in the herbage, particularly from mid-winter to early summer, over which period phosphorus application per se had minimal effect. The application of lime allied with 134 kg N ha-1 year-1 maintained a high level of dry matter production as well as a more adequate and better balanced nutrient content in the kikuyu pasture throughout the year, and particularly in winter, when cattle grazing kikuyu pastures suffer a serious feed gap.

scholarly journals Nitrogen and Phosphorus Concentration in Leaf Litter and Soil in Xishuangbanna Tropical Forests: Does Precipitation Limitation Matter?

Forests ◽  
2019 ◽  
Vol 10 (3) ◽  
pp. 242
Author(s):  
S. Mani ◽  
Min Cao
Keyword(s):  
Leaf Litter ◽  
Tropical Forests ◽  
Monthly Interval ◽  
Phosphorus Concentration ◽  
Monthly Precipitation ◽  
Soil N ◽  
Nitrogen And Phosphorus ◽  
Total N ◽  
Forest Biogeochemistry ◽  
One Year

Tropical forests are generally expected to be limited by the availability of nitrogen (N) and phosphorus (P), and these nutrient limitations could be increased by changes in forest biogeochemistry due to limited precipitation. This effect is presumed to be enhanced in the forests predominated by monsoon climate. The present study examined the impacts of monthly precipitation on total N and P in leaf litter and soil of Xishuangbanna tropical forests. Litterfall and top soil were sampled from each of the five 20 × 20 m plots established in the primary (PTF) and secondary tropical forests (STF), at monthly interval for one year. Soils were strongly acidic and showed significant differences between the sites. The monthly amounts of soil and leaf litter nutrients showed great variations between the PTF and STF. Leaf litter N and P were associated with precipitation in both dry and rainy seasons. Soil N and P were not significantly related to precipitation, indicating that changes in vegetation composition and litterfall production together accounted for variation in soil N and P. Our results suggest that the precipitation limitation may affect the leaf litter N and P changes, but did not support the prediction that precipitation limitation can immediately lead to effects on soil N and P in the Xishuangbanna tropical forests.

Organoleptic Examination of Pears from Trees Infused with Oxytetracycline to Remit Symptoms of Pear Decline

1979 ◽  
Vol 42 (9) ◽  
pp. 732-734 ◽  
Author(s):  
LESTER HANKIN ◽  
GEORGE H. LACY ◽  
JOHN L. MCINTYRE
Keyword(s):  
Post Harvest ◽  
One Year

One year after trees had been infused post-harvest with oxytetracycline (OTC) to remit symptoms of pear decline, pears were harvested and tasted. In four sessions, the panel of tasters discerned between pears from trees treated with OTC and pears from untreated diseased trees. In three of the sessions, the fruit from treated trees was preferred over fruit from untreated diseased trees.

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