Viktorija Zagorska

• PhD
• Managing Director at Latvia University of Life Sciences and Technologies

The honey bee (Apis mellifera) is the most widely managed pollinator and is vital for crop fertilization. Recently, bee colonies have been suffering high mortality rates, exacerbated by factors such as land-use changes and the use of pesticides. Our work aimed to explore the residues of pesticides in honey-bee-collected pollen and how this contamin...

Apple orchards are perennially planted where pesticides are applied to control numerous pests and diseases. The extensive long-term use of fungicides can lead to overall environmental load and resistance risk. This study aims to assess which fungicide-active substances have been used more intensively in the last decade in Latvia, evaluating the ove...

Bumblebee activity interaction with solar irradiation, solar irradiation and HPS lighting irradiation, the HPS effect of photoperiod, day temperature and hive density were assessed with tomato fruit weights in a commercial tomato glass greenhouse in 2020–2021. Pollination activity was measured by observing ten randomly chosen cv. ‘Beorange’ tomato...

Beekeeping in Latvia has a long tradition and it is a classical branch of agriculture. In Latvia, there is no traditional beekeeping region, and beekeeping is performed in all regions. Honey yield is influenced by various factors-variety of crops (nectar plants) around the apiary, man-made changes in land/forests (deforestation), climate change, be...

A flat plate solar collector with cell polycarbonate absorber and transparent cover has been made and its experimental investigation carried out. The collector consists of a wooden box, into which, a layer of heat insulation with a mirror film and 4 mm thick cell polycarbonate sheet, as the absorber, are placed. The coherence between collector's ef...

The heat solar energy traditionally is used in greenhouses for ensuring optimal plant vegetation regime in our climatic conditions. Glass verandas built during last centuries at the south side of living houses and summer cottages are appreciated as original use of solar energy. Veranda as light and warm room was used for different household needs a...

The article deals with problem solving of mathematical physics using the method of separation of variables optimizing heating element – optimizing water tube parameters (tube material, radius, insulation thickness, choosing appropriate surrounding environment). For ensuring piglets comfort, concrete floor panels heated by electric current or hot wa...

From August 6 2011 till September 29 2011 an experimental investigation of hybrid classic photovoltaic-thermal solar collector MWPVT-1414 was carried out. The hybrid solar battery had produced 23.01 kWh of electric energy during 55 days of investigation, or 0.418 kWh per day on average. It was calculated that during the summer months from March 1 t...

Effective ventilation systems in pigsties play a vital role in the pig industry. This paper provides a critical literature review of academic texts related to alternative ventilation systems in a pigsty. The aim of the critical literature review was to discover the most promising pig farrowing ventilation system design for Latvian climatic conditio...

The purpose of this paper is to show the use of mathematical physics in solving engineering problems with the help of the separation of variables method, using optimizing heating element - placement of the electrical wire or hot water tube in concrete panel housing. During the research heat flows from all 4 surfaces (right, left, upper, and bottom)...

The research has been developed with regard to some private living houses in Latvia. In order to provide a house with periodical stoking, its heating system has been equipped with a heat accumulator. The capacity of the hot water accumulator is about 10m 3 and it is placed into the ground. The heating system has already been successfully used for s...

2 was analyzed. Energy supply system is provided with solar energy collector, gas type furnace system, hot water accumulation system, divided canalization system (toilet wastewater and wastewater from washing machines), air ventilation system with heat recovery equipment, greenhouse (indoor garden) as essential element of the building where bioproc...

Alongside with traditional energy resources such as fossil fuel in all its variety - coal, wood, petroleum products, fuel gas - interest is raising about low temperature heat source usage, when heat pump is transforming it to the required higher temperature. The aim of the research is to ascertain in the conditions of production the suitability of...

A lot of various types and modifications of solar collectors are known. Aimed to evaluate the possibilities of the use of solar collectors for warm water production in meteorological conditions of Latvia all over the year in the agency of the Latvia University of Agriculture (LLU), Research Institute of Agricultural Machinery (LTZI) in collaboratio...

To raise the level of energy efficiency of the ventilation systems of pigsties it is useful to introduce heat exchangers. A heat exchanger is a device built for efficient heat transfer from one medium to another. In the case when a heat exchanger is used in the ventilation systems of premises of pigsties, clean and cold air (in the autumn-winter pe...

The aim of the research is to ascertain in the conditions of production the suitability of the use of the outside air-to-water heat pump for providing energy for heating the water for resting places of piglets' panels. Researches were made in conditions of production in the pigsty with 96 farrowing pigpens. The results shows, that heat pump OCTOPUS...

The value and the intensity of solar radiation depend on the latitude and weather conditions of the place. The heat energy produced by a solar collector depends on the type and design of the collector. Several types of solar collectors both theoretically and experimentally have been investigated. One of them vacuum tube collector Vitosol 200 SD. Du...