Search results for "riga"

The effect of alternating different water qualities on accumulation and leaching of solutes in a Mediterranean cracking soil

2002

The relevance of bypass flow on water flow, solute or pesticide transport is becoming increasingly recognized. Recent investigations proved that soil salinization may be influenced by bypass flow, i.e. the rapid transport of water and solutes via macropores and/or shrinkage cracks to subsoil and groundwater. This paper explores the role of bypass flow in the process of accumulation and leaching of solutes, as well as of sodium, in a Mediterranean cracking soil irrigated with saline/sodic waters. The results of bypass flow experiments performed on undisturbed soil cores showed that leaching of solutes occurred in concomitance with bypass fluxes when a low salinity solution was alternated wit…

Effect of irrigation with treated wastewater on bermudagrass (Cynodon dactylon (L.) Pers.) production and soil characteristics and estimation of plan…

2022

In recent years, climate change has greatly affected rainfall and air temperature levels leading to a reduction in water resources in Southern Europe. This fact has emphasized the need to focus on the use of non-conventional water resources for agricultural irrigation. The reuse of treated wastewater (TWW) can represent a sustainable solution, reducing the consumption of freshwater (FW) and the need for mineral fertilisers. The main aim of this study was to assess, in a three-year period, the effects of TWW irrigation compared to FW on the biomass production of bermudagrass [Cynodon dactylon (L.) Pers.] plants and soil characteristics and to estimate the nutritional input provided by TWW ir…

Baltijas loma internacionālajās brigādēs Spānijas pilsoņu kara laikā

2015

Šī pētījuma mērķis ir analizēt Igaunijas, Latvijas un Lietuvas brīvprātīgo līdzdalību Spānijas pilsoņu karā (1936-1939). Lai izveidotu šo kopīgo vēsturisko stāstījumu ir izmantoti un pārstrādāti daudzveidīgi dokumentāli avoti. Baltijas brīvprātīgo loma ir tēma, kura nepamatoti palika aizmirsta, mūsdienu pētījumiem ir labi dokumentēta bāze. Kamēr visu trīs Baltijas valstu autoritārās valdības bija pasludinājušas sevi neitrālas Spānijas konfliktā (kā lielākā daļa Eiropas valstu), notika savdabīga jauniešu mobilizācija, kuri saprota, ka Spānijas konflikts ir cīņa pret starptautisko nacistu fašisma universālajā dimensijā.

Polish discourses concerning the Spanish Civil War. Analysis of the Polish press 1936-2015

2018

The Spanish Civil War of 1936–1939, as an ideologised and mythologised event, has been and is still used instrumentally within the Polish public discourse. The war was an important subject for the Polish press in the years 1936–1939. The Catholic, national-democratic, and conservative press supported General Franco’s rebellion. The governmental and pro-government press also supported the rebels. The Christian-democratic and peasants’ party press remained neutral. The social demo­cratic, communist, and radical press backed the Spanish Republic — as did liberal-conservative organs such as Wiadomości Literackie. After the Second World War, the Polish communist media created the positive legend…

In memory of the celebration of the 50th Jubilee of the Riga Natural Sciences Association

1895

Speise - Karte zur Erinnerung an die Feier des 50jr. Jubiläums des Naturforscher-Verein zu Riga mit mit Elementen der Paläontologie und Cartoons. Rīgas Dabaspētnieku biedrības 50 gadu jubilejas piemiņas ēdienkarte ar paleontoloģijas elementiem un karikatūrām. (BOT15515)

Bericht über die Sitzung der Stadtverordneten Versammlung vom 29. April 1918

1918

Origanum vulgare subsp. hirtum Essential Oil Prevented Biofilm formation and showed antibacterial activity against planktonic and sessile bacterial c…

2013

Essential oils from six different populations of Origanum vulgare subsp. hirtum were compared for their antibiofilm properties. The six essential oils (A to F) were characterized by a combination of gas chromatography with flame ionization detector and gas chromatography with mass spectrometer detector analyses. All oils showed weak activity against the planktonic form of a group of Staphylococcus aureus strains and against a Pseudomonas aeruginosa ATCC 15442 reference strain. The ability to inhibit biofilm formation was investigated at sub-MIC levels of 200, 100, and 50 m g/ml by staining sessile cells with safranin. Sample E showed the highest average effectiveness against all tested stra…

Les chiffres du crime en débat. Pour une exploitation raisonnée des statistiques pénales en sciences sociales

2007

Deficit irrigation does not affect alternate bearing of ‘Valencia’ orange trees

2018

This study evaluated the effect of long-term partial rootzone drying and continuous deficit irrigation on the degree of alternate bearing of adult ‘Valencia’ orange trees grown in northern Sicily. Three irrigation strategies were imposed in summer from 2007 to 2011: irrigation with volumes corresponding to 100% of crop evapotranspiration applied to entire rootzone (CI), partial rootzone drying (PRD) with 50% of CI water applied to one alternated side of the rootzone, and continuous deficit irrigation (CDI) with 50% of CI water applied to both sides of the rootzone. The experiment was conducted on 48 adult orange trees arranged according to a randomized block design. Weather and soil paramet…

Drought tolerance of clonal Malus determined from measurements of stomatal conductance and leaf water potential.

2003

We examined tolerance to soil drying in clonally propagated apple (Malus domestica Borkh.) rootstocks used to control shoot growth of grafted scions. We measured leaf conductance to water vapor (g(L)) and leaf water potential (Psi(L)) in a range of potted, greenhouse-grown rootstocks (M9, M26, M27, MM111, AR69-7, AR295-6, AR360-19, AR486-1 and AR628-2) as the water supply was gradually reduced. Irrespective of the amount of available water, rootstocks that promoted scion shoot growth (M26 and MM111) generally had higher g(L) and more negative Psi(L) than rootstocks that restricted scion shoot growth (M27 and M9). After about 37 days of reduced water supply, there were significant decreases …