Consulta: subjectFacets:"Nitrates"
Registros recuperados: 23
Data/hora: 05/06/2024 10:18:54

Использование мочевины при выращивании синезеленой микроводоросли Spirulina platensis (Nordst.) Geitl. в накопительной культуре
Provedor de dados: 13
Autores: Дробецкая, И. В.
Приводятся данные о влиянии различных концентраций мочевины, а также разных соотношений мочевины и нитратов в питательной среде на рост и химический состав Spirulina platensis в условиях накопительной культуры. Установлено, что высокие концентрации карбамида в среде (300 мг азота (N)/л и выше) угнетают рост водорослей вплоть до гибели клеток. Использование мочевины в комплексе с нитратами (в соотношении 1:4 по N) оказывает положительный эффект, выражающийся в увеличении продуктивности культуры и содержания белка, хлорофилла а, С-фикоцианина и каротиноидов в биомассе.
Tipo: Journal Contribution
Palavras-chave: Мочевина; Нитраты; Питательная среда; Продуктивность культуры; Биомасса; Urea; Nitrates; Nutrient; Growth rate; Biomass Urea Nitrates Growth rate Biomass Nitrates Biomass Urea Growth rate http://aims.fao.org/aos/agrovoc/c_5187 http://aims.fao.org/aos/agrovoc/c_926 http://aims.fao.org/aos/agrovoc/c_8090 http://aims.fao.org/aos/agrovoc/c_16130.
Ano: 2002
URL: http://repository.ibss.org.ua/dspace/handle/99011/392

Agricultura e qualidade da agua: contaminacao da agua por nitrato.
Provedor de dados: 14
Autores: RESENDE, A. V. de.
bitstream/CPAC-2009/24718/1/doc_57.pdf
Tipo: Documentos (INFOTECA-E)
Palavras-chave: Contamination; Health.; Contaminação; Fósforo; Impacto Ambiental; Nitrogênio; Poluição da Água; Saúde.; Recurso Hídrico; Qualidade da Água; Environmental impact; Eutrophication; Nitrates; Nitrogen; Phosphorus; Water resources.; Water quality; Water pollution.
Ano: 2002
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/546464

Bilan de l'action de remise en eau du marais de kervijen (Littoral de la Baie de Douarnenez) dans le cadre d'une lutte contre la marée verte.
Provedor de dados: 5
Autores: Piriou, Jean-yves.
ln order to limit the excessive growth of macroalgae Ulva sp. on the beach of Kervijen (Bay of Douarnenez, Brittany, France), a field experiment was carried out, whereby part of the flow of a river was diverted into a coastal marsh. Results showed that the major part of spring and summer, Ulva proliferations have been suppressed. Part of the nitrate transported by river flow was consumed. The coastal marsh produced phytoplankton which regularly flowed on the beach
Tipo: Text
Palavras-chave: Marais; Nitrates; Phytoplancton; Ulva sp.; Coastal marsh; Nitrates; Phytoplankton; -U/va sp.
Ano: 1993
URL: http://archimer.ifremer.fr/doc/00132/24299/22297.pdf

Prise simultanee de quatre sources d'azote par le microphytobenthos du chenal de Lauzieres (Charente Maritime-France) en ete
Provedor de dados: 5
Autores: Collos, Y.
Simultaneous uptake of nitrate, nitrite, ammonium and urea by microphytobenthos incubated in batch mode immediately after sampling do not show any kind of interactions. A linear relationship is found between nitrate uptake and ammonium uptake, the latter values being about 2 to 3 times higher than former. Ammonium uptake was not saturated by a substrate level of 10 mu M, possibly indicating diffusion limited uptake. For all nitrogen sources, the uptake rate was related to the substrate concentration rather than the oxidation state of the nitrogen compounds.
Tipo: Text
Palavras-chave: Pond culture; Interactions; Nitrogen compounds; Phytobenthos; Food conversion; Urea; Ammonium compounds; Nitrites; Nitrates.
Ano: 1984
URL: http://archimer.ifremer.fr/doc/1984/acte-1532.pdf

Etude de valorisation de base de données qualité des eaux dans le bassin de Marennes-Oléron et le bassin de La Charente
Provedor de dados: 5
Autores: Eaucea,; Prou, Jean.
L'objet de l'étude est de décrire les liens principaux entre l'hydrologie de la Charente et les constats qualitatifs dans le bassin de Marennes, ainsi que l'estimation des flux continentaux, sur la base des données des stations de Fontenelles et de Boyard entre 1977 et 2006. Du fait de l'influence de la marée, il n'est pas possible de mesurer les débits de la Charente dans sa partie aval. Ils ont donc été reconstitués à partir des stations de Saint-Savinien, du pont de Beillant, de Carillon, du Moulin de Chatre, de la Lijardière, de Jarnac, de Vindelle et de Foulpougne, en fonction de la disponibilité et de la fiabilité des données. Les mesures à Fontenelles et Boyard ont été réalisées de façon à disposer d'une gamme variée de situations par rapport au...
Tipo: Text
Palavras-chave: Hydrologie; Flux continentaux; Cycle de marée; Nitrates; Phosphates; Production primaire; Marennes Oléron; Charente.
Ano: 2006
URL: http://archimer.ifremer.fr/doc/00083/19419/17030.pdf

Nitrate respiration and nitrification in estuarine sediments.
Provedor de dados: 5
Autores: Herbert, R.
Seasonal data and depth profiles using super(15)N-labelled NO sub(3)u- show that denitrification (77-90% of NO sub(3)u- respired) rather than NO sub(3)u- dissimilation to NH sub(4)u+ was the principal route of nitrate reduction in Kingoodie Bay sediments. Populations of both groups of NO sub(3)u- reducing bacteria were highest in the 0-20 mm horizon in those sediments where highest rates of NO sub(3)u- respiration were recorded (28.56 mu g N.d super(-1) dry wt. sediment super(-1)). Autotrophic nitrification rates shared a marked seasonality with highest rates (0.92 mu g N.d super(-1).g dry wt. sediment super(-1)) occurring during the summer. Maximum populations of autotrophic nitrifying bacteria were also found in the 0-20 mm sediment horizon and these...
Tipo: Text
Palavras-chave: Seasonal variations; Bacteria; Estuaries; Sediment chemistry; Biogeochemistry; Ammonia; Nitrates; Nitrogen cycle.
Ano: 1984
URL: http://archimer.ifremer.fr/doc/1984/acte-971.pdf

Reduction du nitrate dans les sediments marins. Comparaison des activites mesurees in vitro et in situ
Provedor de dados: 5
Autores: Esteves, J; Bonin, P; Blanc, F; Mille, G; Bertrand, J.
In vitro nitrate reduction in hydrocarbon-polluted marine sediments has been studied by flow-through system. By analysing the rate of nitrate comsumption as a function of nitrate concentration the authors determined the Michaelis-Menten kinetics parameters. (km = 330 mu M; vax = 2.0 mu M/g super(-1)/h super(-1). The authors found a value of 60 mu M/m super(-2)/h super(-1) for the rate of in vitro nitrate consumption derived from the above kinetic parameters and from the nitrate concentration in the sediment. In parallel a value of 67.4 mu M/m super(-2)/h super(-1) was found for the rate of nitrate consumption under in situ conditions. The great similarity between both results would favor the in vitro technique as a valid and more convenient one.
Tipo: Text
Palavras-chave: MED; Biogeochemistry; Oil pollution; Methodology; Environmental conditions; Experimental research; Comparative studies; Metabolism; Bacteria; Sediment chemistry; Reduction; Nitrates; Denitrification; Nitrogen cycle.
Ano: 1984
URL: http://archimer.ifremer.fr/doc/1984/acte-979.pdf

Release of available nitrogen from river-discharged dissolved organic matter by heterotrophic bacteria associated with the cyanobacterium     Microcystis aeruginosa
Provedor de dados: 5
Autores: Purvina, S; Béchemin, Christian; Balode, M; Verite, Celine; Arnaud, Christophe; Maestrini, Serge Y.
The use of riverine dissolved organic matter by the heterotrophic bacteria associated with a culture of the cyanobacterium Microcystis aeruginosa and release of simple nitrogen compounds were studied in an experimental series. Bacteria reduced the bulk of dissolved organic nitrogen (DON) by half, but when associated with M. aeruginosa, DON was excreted and its concentration rose by 13%. During the stationary growth phase bacteria released ammonium, doubling the concentration of ammonia as well as of nitrates. Bacteria associated with M. aeruginosa consumed riverine DON and joined the ammonification and nitrification process, supplying cyanobacteria with simple nitrogen compounds.
Tipo: Text
Palavras-chave: Microcystis aeruginosa; Heterotrophic bacteria; DOM; DON; Nitrates; Ammonia.
Ano: 2010
URL: http://archimer.ifremer.fr/doc/00353/46408/46122.pdf

Algunas características del florecimiento del fitoplancton en el frente del Río de la Plata. I. Los sistemas nutritivos
Provedor de dados: 20
Autores: Negri, R.M.; Carreto, J.I.; Benavides, H.R.
During the spring (H-04/82: october 11-27, 1982)carried out by the Fishery Research Vessel "Dr.E.Holmberg", the distribution of temperature, salinity, nutrients concentration and photosynthetic pigments were studied at the "Rio de la Plata" maritime front. The presence of Sub-Tropical coastal waters in only station did not allow its characterization. Low Chlorophyll a concentration were noted, in association with scarce concentrations of nutrients and high Margalef index values.
Tipo: Journal Contribution
Palavras-chave: Phytoplankton; Abiotic factors; Water masses; Phosphates; Silicates; Nitrates; Chlorophylls; Estuarine front; Phytoplankton; Nitrates; Nutrients; Phosphates; Silicates; Chlorophylls.
Ano: 1986
URL: http://hdl.handle.net/1834/2041

Protocols for the Joint Global Ocean Flux Study (JGOFS) Core Measurements
Provedor de dados: 20
This manual describes the protocol approved by the international Scientific Steering Committee for the Joint Global Ocean Flux Study (JGOFS) for the most of the 20 JGOFS Core Measurements. However, the methods for the analysis of various parameters of the seawater CO2 system are described in a separate handbook. In order to have a complete set of the JGOFS measurements protocols, you should request a copy of the "Handbook of Methods for the Analysis of the Various Parameters of the Carbon Dioxide System in Seawater"version 2, A.G. Dickson and C. Goyet, eds. ORNL/CDIAC-74.
Tipo: Book
Palavras-chave: Oceanography; Ocean circulation; Oceanographic stations; Oceanographic data; Oceanographic surveys; Samples; Sampling; Data processing; Data; Data collections; Quality control; Salinity measurement; Oxygen; Inorganic carbon; Nitrites; Nitrates; Phosphorus compounds; Phosphorus cycle; Silicate minerals; Marine organisms; Microorganisms; Bacteriology; Bacteria; Zooplankton; Sampling; Nitrites; Nitrates; Zooplankton; Data processing; Data; Oxygen; Microorganisms; Bacteriology; Bacteria; Http://aims.fao.org/aos/agrovoc/c_6774; Http://aims.fao.org/aos/agrovoc/c_5190; Http://aims.fao.org/aos/agrovoc/c_5187; Http://aims.fao.org/aos/agrovoc/c_15490; Http://aims.fao.org/aos/agrovoc/c_10289; Http://aims.fao.org/aos/agrovoc/c_49816; Http://aims.fao.org/aos/agrovoc/c_5477; Http://aims.fao.org/aos/agrovoc/c_4807; Http://aims.fao.org/aos/agrovoc/c_768; Http://aims.fao.org/aos/agrovoc/c_765.
Ano: 1994
URL: http://hdl.handle.net/1834/2795

Water Quality Bulletin Of The Urban Area Of Dakar
Provedor de dados: 20
In the urban area of Dakar, excessive nitrate concentrations beyond the OMS standards of 50 mg/l were recorded in the wells and bore holes catching the underground aquifer of the quaternary sands, thus endangering the peninsula water resources.
Tipo: Report
Palavras-chave: Water pollution; Nitrates.
Ano: 2002
URL: http://hdl.handle.net/1834/668

Modeling laboratory culture of Gracilaria verrucosa (Hudson) Papenfuss according to nutrients concentrations and salinities levels
Provedor de dados: 20
Autores: Mensi, F.; Ksouri, J.; Seale, E. G.; Romdhane, M.S.
L'exploitation des algues rouges appartenant au genre Gracilaria pour l'extraction de l'agar a considérablement augmenté au cours des dernières décennies. En Tunisie Gracilaria verrucosa (Hudson) Papenfuss 1950 (Rhodophyta), est candidate pour la culture dans la lagune de Bizerte (Nord de la Tunisie) où ne pousse que sur une courte période de l’année. Ainsi, le but de cette étude est de recueillir des informations de base sur sa croissance dans cette région. Les effets de la salinité des sources d’azote et du phosphore ainsi que leurs concentrations sur la croissance de cette algue ont été étudiés à l'échelle de laboratoire en utilisant la méthodologie de surface des réponses. Afin de déterminer les interactions entre les variables et les niveaux optimaux...
Tipo: Journal Contribution
Palavras-chave: Algae; Ammonium; Red algae; Salinity; Growth; Nitrates.
Ano: 2011
URL: http://hdl.handle.net/1834/4734

Variations des teneurs en chlorophylle &lt;a&gt; et en sels nutritifs dans la lagune de l'Ichkeul
Provedor de dados: 20
Autores: Chaouachi, B.; Ben Hassine, O. K.; Lemoalle, J.
Le suivi régulier des teneurs en chlorophylle a et en sels nutritifs dans la lagune de l'Ichkeul durant l’année 1993 a permis de mieux comprendre le fonctionnement de cet écosystème, milieu original et complexe. Les cycles annuels de la chlorophylle et des sels nutritifs montrent des fluctuations importantes, à l'échelle hebdomadaire. Les fortes biomasses phytoplanctoniques sont observées en hiver en période de courant sortant, en opposition avec les concentrations de phosphore réactif dissous qui ne sont notables que dans l’oued Tinja par courant entrant. Les nitrates et nitrites sont en concentrations plus irrégulières, sans saisonnalité marquée. La gamme des concentrations mesurées en 1993 a été comparable à celle observée lors des années précédentes.
Tipo: Journal Contribution
Palavras-chave: Nitrites; Chlorophylls; Ecosystems; Nitrates; Phosphates; Phytoplankton; Nitrites; Ecosystems; Nitrates; Phytoplankton; Chlorophylls; Phosphates; Http://aims.fao.org/aos/agrovoc/c_5190; Http://aims.fao.org/aos/agrovoc/c_2482; Http://aims.fao.org/aos/agrovoc/c_5187; Http://aims.fao.org/aos/agrovoc/c_13344; Http://aims.fao.org/aos/agrovoc/c_1577; Http://aims.fao.org/aos/agrovoc/c_35986.
Ano: 2001
URL: http://hdl.handle.net/1834/3701

Determination of nitrate ion in marine biotopes with high nitrate content by ultraviolet spectrophotometry
Provedor de dados: 27
Autores: Mertens, J.; Massart, D.L.
A simple and rapid method for the determination of nitrate in seawater of high nitrate content (&gt;1 ppm) is proposed. The absorption of the nitrate ion is measured at 210 and 220 mµ. The sample is treated with a measured quantity of hydrochloric acid to eliminate the carbonate and bicarbonate interferences and measured against a nitrate free blank prepared by reduction of the nitrate to ammonia with Raney nickel. The addition of HCl permits also storage of the sample without special precautions and the use of the blank eliminates the most serious of the interferences (bromide) expected in seawater. The interference of organic matter limits however the applicability of the method to concentrations higher than 1 ppm.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Marine environment; Nitrates; Spectroscopy.
Ano: 1971
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=3424

An experiment on the relative importance of denitrification, nitrate reduction and ammonification in coastal marine sediment
Provedor de dados: 27
Autores: Goeyens, L.; De Vries, R.T.P.; Bakker, J.F.; Helder, W.
Simultaneous determinations of &lt;sup&gt;15&lt;/sup&gt;N-nitrogen gas production, &lt;sup&gt;15&lt;/sup&gt;N-ammonia formation by nitrate reduction and ammonia production from organic nitrogen were carried out after addition of &lt;sup&gt;15&lt;/sup&gt;N-nitrate to anaerobically incubated sediment slurries from a location in the Dutch Wadden Sea. The rate of nitrogen gas production was 1.75 µmol N.cm&lt;sup&gt;-3&lt;/sup&gt; wet sediment.d&lt;sup&gt;-1&lt;/sup&gt;, nitrate reduction to ammonia occurred to a rate of 0.79 µmol N.cm &lt;sup&gt;-3&lt;/sup&gt;.d &lt;sup&gt;-1&lt;/sup&gt; and ammonification at 1.17 µmol N-cm &lt;sup&gt;-3&lt;/sup&gt;.d &lt;sup&gt;-1&lt;/sup&gt;. At the end of the incubation experiment (after 30 h) 63% of the originally added...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ammonia; Biogeochemical cycle; Coastal zone; Denitrification; Nitrates; Nitrogen cycle; Sediments.
Ano: 1987
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=3169

Determination of methanesulfonic acid and non-sea-salt sulfate in single marine aerosol particles
Provedor de dados: 27
Autores: Kolaitis, L.N.; Bruynseels, F.; Van Grieken, R.; Andreae, M.O.
In open ocean waters the predominant volatile sulfur compound is dimethyl sulfide (DMS), representing almost 90% of the marine sulfur emissions. Methanesulfonic acid (MSA), one of the oxidation products of DMS, is consequently an important constituent of marine aerosols. Laser microprobe mass analysis (LAMMA) has been used for single-particle analysis of particles collected in the marine boundary layer. MSA, like the non-sea-salt sulfate, is mainly associated with the smallest aerosol particles, whose LAMMA spectra match the reference fingerprint spectra of MSA salts, sodium methanesulfonate and ammonium methanesulfonate. The presence of nitrate and heavy metal ions in the LAMMA spectra can reveal, to a certain extent, the degree of air pollution at the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Aerosols; Air pollution; Boundary layers; Heavy metals; Marine environment; Nitrates; Particle size; Sulphates.
Ano: 1989
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=3177

Chlorination: phytotoxicity and effects on the production and quality of Lactuca sativa var. Mantecosa grown in a closed, soil-less system
Provedor de dados: 85
Autores: Premuzic,Z; Palmucci,HE; Tamborenea,J; Nakama,M.
The addition of chlorine constitutes an economical disinfection method for closed, soil-less systems. Three quantities of sodium hypochlorite (0.55, 5.5 and 11 ppm) were applied to closed, soil-less greenhouse- grown lettuce (Lactuca sativa), to study the effect on its production (fresh weight and dry matter) and some commercial and nutritional quality factors (phytotoxicity, Vitamin C, nitrates). Sodium hypochlorite was weekly added within the nutrient solution, and the chemical properties (pH, EC and chlorides) of the recycled solution were measured. Damage to leaves was evaluated 15 days before harvest. Chlorination produced different effects regarding both production and quality. All treatments presented plants with excellent commercial weight,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Chlorination; Lactuca sativa; Nitrates; Phytotoxicity; Vitamin C.
Ano: 2007
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-56572007000100010

THE CONSUMPTION OF MINERAL FERTILIZERS AND WATER RESOURCES’ QUALITY IN THE EUROPEAN UNION AND THE REPUBLIC OF SERBIA
Provedor de dados: 31
Autores: Roljevic,   Svetlana; Nikolic,   Aleksandra; Tepavac,   Rajko.
Professional paper
Tipo: Article
Palavras-chave: Agriculture; Water resources; Mineral fertilizers; Nitrates; Agribusiness; Environmental Economics and Policy; Q25; Q53.
Ano: 2012
URL: http://purl.umn.edu/123965

A Comparison of Actual and Hypothetical Willingness to Pay of Parents and Non-Parents for Protecting Infant Health: The Case of Nitrates in Drinking Water
Provedor de dados: 31
Autores: Loomis,   John B.; Bell, Paul; Cooney, Helen; Asmus, Cheryl.
We estimate adults’ willingness to pay (WTP) to reduce health risks to their own or other families’ infants to test for altruism. A conjoint analysis of adults paying for bottled water found marginal WTP for reduction in risk of shock, brain damage, and mortality in the cash treatment of $2, $3.70, and $9.43, respectively. In the hypothetical market these amounts were $14, $26, and $66, indicating substantial hypothetical bias, although not unexpected due to the topic of infant health. Statistical tests confirm a high degree of altruism in our WTP results, and altruism held even when real money was involved.
Tipo: Journal Article
Palavras-chave: Altruism; Conjoint; Drinking water; Nitrates; Validity; Willingness to pay; Agricultural and Food Policy; Consumer/Household Economics; Food Consumption/Nutrition/Food Safety; Health Economics and Policy; Institutional and Behavioral Economics; I10; Q53.
Ano: 2009
URL: http://purl.umn.edu/56657

Benefits of Safer Drinking Water: The Value of Nitrate Reduction
Provedor de dados: 31
Autores: Crutchfield,   Stephen R.; Cooper,   Joseph C.; Hellerstein,   Daniel.
Nitrates in drinking water, which may come from nitrogen fertilizers applied to crops, are a potential health risk. This report evaluates the potential benefits of reducing human exposure to nitrates in the drinking water supply. In a survey, respondents were asked a series of questions about their willingness to pay for a hypothetical water filter, which would reduce their risk of nitrate exposure. If nitrates in the respondent's drinking water were to exceed the EPA minimum safety standard, they would be willing to pay $45 to $60, per household, per month, to reduce nitrates in their drinking water to the minimum safety standard. There are 2.9 million households in the four regions studied (White River area of Indiana, Central Nebraska, Lower...
Tipo: Report
Palavras-chave: Water quality; Drinking water; Nitrates; Benefits; Contingent valuation; Resource /Energy Economics and Policy.
Ano: 1997
URL: http://purl.umn.edu/34025

TRADABLE PERMITS FOR CONTROLLING NITRATES IN GROUNDWATER AT THE FARM LEVEL: A CONCEPTUAL MODEL
Provedor de dados: 31
Autores: Morgan,   Cynthia L.; Coggins,   Jay S.; Eidman,   Vernon R.
Nitrate contamination of municipal and domestic well water supplies is becoming an increasing problem in many rural and urban areas, raising the cost of providing safe drinking water. The objective of this paper is to describe a marketable permit scheme that can effectively manage nitrate pollution of groundwater supplies for communities in rural areas without hindering agricultural production in watersheds. They key to implementing this scheme is being able to link nitrate leaching from nitrogen fertilizer applied to crops at a farm to nitrate levels measured at a drinking water well.
Tipo: Journal Article
Palavras-chave: Agriculture; Groundwater pollution; Leaching; Nitrates; Pollution trading; Environmental Economics and Policy.
Ano: 2000
URL: http://purl.umn.edu/15488

The effect of nitrogen and sulphur fertilization on yield and quality of kohlrabi (Brassica oleracea, L.)
Provedor de dados: 90
Autores: Losák,Tomáš; Hlušek,Jaroslav; Kráěmar,Stanislav; Varga,Ladislav.
In a greenhouse pot experiment with kohlrabi, variety Luna, we explored the joint effect of N (0.6 g N per pot = 6 kg of soil) and S in the soil (25-35-45 mg kg-1 of S) on yields, on N, S and NO3- content in tubers and leaves, and on alterations in the amino acids concentration in the tubers. S fertilisation had no effect on tuber yields. The ranges of N content in tubers and leaves were narrow (between 1.42-1.48 % N and 1.21-1.35 % N, respectively) and the effect of S fertilisation was insignificant. S concentration in the tubers ranged between 0.59 and 0.64 % S. S fertilisation had a more pronounced effect on the S concentration in leaf tissues where it increased from 0.50 to 0.58 or to 0.76 % S under the applied dose. The NO3- content was higher in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ammonium sulphate; Dose; Tuber; Leaves; Nitrates; Amino acid concentrations.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832008000200024

Quantifying Nitrate Leaching in Irrigated Wheat with Different Nitrogen Fertilization Strategies in an Alfisol
Provedor de dados: 117
Autores: Claret M,Marcelino; Urrutia P,Roberto; Ortega B,Rodrigo; Best S,Stanley; Valderrama V,Natalia.
Consumption of water contaminated with nitrates is associated with important health effects such as methemoglobinemia and gastric cancer. Intensive agriculture, which uses large quantities of N fertilizer, is the main source of nitrates in water systems. There are several strategies to reduce leaching and increase Nitrogen Use Efficiency (NUE). An experiment was conducted with spring wheat (Triticum aestivum L.) under sprinkler irrigation (center pivot) to determine if adjusted N applications using precision agriculture tools and plant demand resulted in a lower groundwater nitrate load. Evaluated treatments were: produced fertilization (Pr), precision agriculture (Pa), chlorophyll meter (Sm), and control without N (W/N). The ceramic capsule methodology...
Tipo: Journal article
Palavras-chave: Nitrates; Precision agriculture; Chlorophyll meter; Wheat.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392011000100018