Tag Archives: solar radiation

426–434 P. Kic
Effect of construction shape and materials on indoor microclimatic conditions inside the cowsheds in dairy farms
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Effect of construction shape and materials on indoor microclimatic conditions inside the cowsheds in dairy farms

P. Kic

Czech University of Life Sciences Prague, Faculty of Engineering, Department of Technological Equipment of Buildings, Kamýcká 129, CZ165 21 Prague, Czech Republic
E-mail: kic@tf.czu.cz

Abstract:

The aim of this paper is to present the results of microclimatic research focused on the indoor conditions in cowsheds and milking parlours in two dairy farms. The attention is paid mainly to the construction and materials used for buildings, which can influence together with technological equipment and system of ventilation the microclimatic conditions inside the cowsheds. In the frame of this research main parameters of internal and external properties of climate (air temperature, humidity, globe temperature, THI, BGHI and concentration of CO2) during the hot summer were measured and evaluated. Results of long time and short time measurements show very important role of used materials and shape of buildings. The research results show that the use of principles of passive air conditioning can contribute significantly to the improvement of internal microclimate. Reduced amplitude of temperature oscillation was 42.4% of amplitude of outside air temperature in cowshed with massive construction and 91.7% in modern light building. The average phase shift of temperature oscillations, expressed as a time delay of internal temperature rise behind the external temperature rise was about 2.8 hours and time delay of drop of internal temperature behind external temperatures drop was 3.3 hours in massive cowshed. The same parameters in modern light cowshed were only 1.1 hours and 0.5 hours.

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82–90 P. Kic
Microclimatic conditions in the poultry houses
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Microclimatic conditions in the poultry houses

P. Kic

Czech University of Life Sciences Prague, Faculty of Engineering, Department of
Technological Equipment of Buildings, Kamýcká 129, CZ 165CZ 21 Prague,
Czech Republic; Correspondence: kic@tf.czu.cz

Abstract:

The aim of this paper is to present the results of microclimatic research focused on the indoor conditions in several agricultural buildings used for fattening of chicken broilers. The attention is paid mainly to the construction of the building and its position in the farm area, which together with technological equipment of the building, floor covering, and system of ventilation, can influence the microclimatic conditions inside the halls. In the frame of this research main parameters of internal and external properties of climate were measured and evaluated. Themeasurement results of the air temperature, humidity, globe temperature, concentration of CO2, dust pollution and surface temperatures show rather important role of the overall layout of buildings, influence of the wind and solar radiation together with surroundings. The research results show that to the improvement of internal microclimate can contribute significantly the use of principles of passive air conditioning. The acquired new knowledge can be useful not only to improve the current situation on the farm, but mainly for the improvement of the building
constructions in similar new farms.

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435-444 W. Bres and M. Jerzy
Changes of nutrient concentration in chrysanthemum leaves under influence of solar radiation
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Changes of nutrient concentration in chrysanthemum leaves under influence of solar radiation

W. Bres¹ and M. Jerzy²

¹Department of Horticultural Plant Nutrition , Poznan University of Life Sciences, Zgorzelecka4, 60-198 Poznań, Poland; e-mail: wbnaw@au.poznan.pl
²Department of Ornamental Plants, Poznan University of Life Sciences,Dabrowskiego 159, 60-594 Poznań, Poland

Abstract:

Eleven pot cultivars of the chrysanthemum (Chrysanthemum x grandiflorum /Ramat./ Kitam.) were grown in 12 year-round cycles. Starting with 2 January 2002, on the second day of each successive month, rooted cuttings of all the chrysanthemum cultivars were planted into pots 14 cm in diameter, 5 cuttings per pot. From the day of potting, the plants were exposed to short-day treatment. In periods of naturally long days, the day was shortened to 10.5 hours. From November till mid-February (days under 10 hours), no supplementary assimilation light was used to improve the light conditions in the period of insolation deficit. Depending on weather conditions, the electrolytical conductivity of the nutrient solution used for plant feeding varied between 1.8 mS cm-1 (in summer) and 2.2 mS cm-1 (in winter). To prepare the nutrient solution rainwater was used. When 30% of inflorescences were in flower, for chemical analysis well-developed leaves from plants were sampled. The total concentrations of macro- and microelements in plant tissue were determined. To find the relationship between nutrient concentration in plant tissue and radiation, data were analysed using simple linear regression models. Radiation had an effect on nutrient concentration in chrysanthemum leaves. The highest determination coefficient R2 for P and Ca, the lowest for N and K were calculated.

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