nutrient loading Articles
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Nutrient loads and their impacts on chlorophyll
a in the Mae Klong River and estuarine ecosystem: an approach for nutrient criteria developmentInvestigations on the water quality of the Mae Klong River and Estuary were conducted from April 2005 to February 2006 during periods of early-, mid-, and late-loading. Nutrient loads and transfer patterns were studied together with clarification of contaminated sites. The results indicated that NH4+, NO2− + NO3−, Si(OH)4 and PO43− concentrations varied by season and were comparatively high in ...
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The effects of Parachlorella kessleri cultivation on brewery wastewater
Bioindustrial wastewaters, often characterised by high carbon and nitrogen contents, have shown promise as a valuable resource for the cultivation of beneficial microorganisms. The purpose of this study was to assess if Parachlorella kessleri could utilise brewery wastewater (Br WW) for growth and production of metabolites. P. kessleri was cultivated on different concentrations of Br WW over ...
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Reuse: Agriculture
Agronomic and water quality considerations Water use for agricultural irrigation is the largest component of water use in most countries and is more than 70% of human water use in drier countries. Use of recycled water for irrigation requires consideration of soil types, groundwater levels, soil and water chemistry, nutrient loads, limits on chemicals, the salt tolerance of crops, the ...
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Nutrient load concept-reservoir vs. bay impacts: a case study from a semi-arid watershed
Large flow-through reservoirs and lakes possess environmental gradients and monitoring programs are mostly adapted for cost and time effectiveness. Bay areas are often more isolated from the main water body and are likely to have unobserved different environmental processes and impacts. This study was performed at the Itaparica Reservoir, São Francisco River, located in semi-arid Northeast ...
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Plant growth and nutrient uptake in treatment wetlands for water with low pollutant concentration
The objective of this study was to determine how macrophytes commonly used in treatment wetlands (TWs) respond to water with low pollutant concentration. We measured pollutant removal efficiency and compared growth and nutrient uptake of five macrophytes in demonstration scale units (volume >40 m3) irrigated by water with pollutant concentrations representative of average urban stormwater ...
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The manage database: nutrient load and site characteristic updates and runoff concentration data
The 'Measured Annual Nutrient loads from AGricultural Environments' (MANAGE) database was developed to be a readily accessible, easily queried database of site characteristic and field-scale nutrient export data. The original version of MANAGE, which drew heavily from an early 1980s compilation of nutrient export data, created an electronic database with nutrient load data and corresponding site ...
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Effects of pulsed atrazine exposures on autotrophic community structure, biomass, and production in field‐based stream mesocosms
We performed a multiple‐pulsed atrazine experiment to measure responses of autotrophic endpoints in outdoor stream mesocosms. The experiment was designed to synthetically simulate worst‐case atrazine chemographs from streams in agricultural catchments to achieve 60‐day mean concentrations of 0 (control), 10, 20, and 30 µg/L, respectively. We dosed triplicate streams with pulses of 0, 50, 100, ...
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The Effect of Wastewater Irrigation on Perennial Energy Crops
Using treated wastewater to irrigate energy crops is a favourable alternative for traditional irrigation, especially on marginal lands or in seasons when water is scarce. Although irrigating crops with reused wastewater (even when used to irrigate non-food crop) not always have social acceptance, considering the amount of wastewater daily available, and its high nutrient loads, it is a ...
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Sustainability of Current Agricultural Practices in The Cameron Highlands, Malaysia
Cameron Highlands is a mountainous region with steep slopes. Gradients exceeding 20◦ are common. The climate is favourable to the cultivation of tea, sub-tropical vegetables and flowers (under rain-shelter). Crop production is sustained by high fertiliser and manure applications. However, agriculture in this environment is characterised by high levels of soil erosion and environmental ...
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On-line measurements provide more accurate estimates of nutrient loading: a case of the Yläneenjoki river basin, southwest Finland
Automatic on-line measurement stations for water quality components and water level were equipped with dataloggers and GSM transmitters; the stations were installed at two sites in the Yläneenjoki river basin, SW Finland. Measurements during five seasons in 2006–2007 were conducted to find out whether the produced data would provide more accurate estimates of material and nutrient transport than ...
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Impacts of fertilization on water quality of a drained pine plantation: a worst case scenario
Received for publication December 8, 2008. Intensive plantation forestry will be increasingly important in the next 50 yr to meet the high demand for domestic wood in the United States. However, forest management practices can substantially influence downstream water quality and ecology. This study analyses, the effect of fertilization on effluent water quality of a low gradient drained coastal ...
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Sustainability of Current Agricultural Practices in The Cameron Highlands, Malaysia
Cameron Highlands is a mountainous region with steep slopes. Gradients exceeding 20∘ are common. The climate is favourable to the cultivation of tea, sub-tropical vegetables and flowers (under rain-shelter). Crop production is sustained by high fertiliser and manure applications. However, agriculture in this environment is characterised by high levels of soil erosion and environmental ...
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Rice growth, grain yield, and floodwater nutrient dynamics as affected by nutrient placement method and rate
The loss of major nutrients can be high in rice (Oryza sativa L.) fields, particularly rainfed rice, where water flowing from field to field during periods of high rainfall not only reduces the nutrient use efficiencies but also has the potential for environmental degradation. We examined the influence of deep point placement of N, P, and K briquettes compared to broadcast incorporation of N, P, ...
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Global transcriptomic profiling in barramundi Lates calcarcifer from rivers impacted by differing agricultural land‐uses
Most catchments discharging into the Great Barrier Reef (GBR) lagoon have elevated loads of suspended sediment, nutrients, and pesticides, including photosystem II inhibiting herbicides, associated with upstream agricultural land use. To investigate potential impacts of declining water quality on fish physiology, RNASeq was used to characterize and compare the hepatic transcriptomes of ...
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Lagoon treatment for manure case study
Are you getting a scale build up in your recirculation system from your manure holding ponds (lagoons)? Is it calcium carbonate or struvite (magnesium-ammonia-phosphate) crystals? In some CAFO sites, they will use anaerobic lagoons to reduce the amount of manure that they need to treat. In a zero oxygen environment the anaerobic bacteria will take the manure which is loaded with nutrients and ...
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Evaluating cumulative effects of anthropogenic inputs in Prince Edward Island estuaries using the mummichog (Fundulus heteroclitus)
Estuarine eutrophication as a result of agricultural land use including the use of chemical fertilizers is increasing worldwide. Prince Edward Island, Canada has very high agricultural intensity by international standards with approximately 44% of the land area under production, and some watersheds in excess of 75% agricultural land‐use. The type of agriculture is also intensive with primarily ...
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Why are we monitoring nutrients at different depths?
Recently, LG Sonic introduced the MPC-Lab, an innovative monitoring buoy that can monitor algae, physico-chemical variables, and even nutrients such as nitrogen and phosphorus in near real-time and at different depths in a body of water. Combined with our other monitoring tools, this system offers a unique way to detect the spatial and temporal patterns of nutrient concentrations which play a ...
By LG Sonic
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Bacterial disease of Shrimp
Rickettsial Infections This infection is not recorded yet from Indian waters, systemic rickettsial infections were reported from cultured P. monodon from Malaysia and Singapore. In P. monodon, the rickettsia occurred within large cytoplasmic vacuoles where it formed-microcolonies of 19 to 33 f.lm in diameter. In heavy infections, cells with rickettsial inclusions were widespread in mesodermally ...
By Vinnbio
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Improving Poultry Wastewater Treatment Site Summary - Case Study
Site Summary Petrox DN bioaugmentation was implemented at a poultry processing plant to deal with a recurring problem of excessive ammonia levels in wastewater discharge. Petrox ND bioaugmentation reduced the organic carbon load in the wastewater and converted the ammonia to nitrogen gas. Within 48 hours of treatment the ammonia levels in the wastewater were reduced to acceptable levels and ...
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Influence of environment on plants
There is no denying the importance of light for the growth of plants; however, there are many other environmental factors—such as temperature, moisture and nutrient availability, and soil type–that also influence plant growth. These factors do not act in isolation and are, many times, correlated. So, it is interesting to see how light works in combination with other resources to ...
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