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Laboratory experiments were carried out in the laboratory of Raw Materials for Food Agronomic and Livestock Research of Agronomy Faculty of the Lithuanian University of Agriculture in 2009. The investigation focused on Solanum tuberosum L. cv. ‘Goda’ and Solanum tuberosum L. cv. ‘Solara’. The aim of this paper was to identify the effect of high/low temperatures on the potato tuber sprout initiation at the apical dominance stage. Potato tubers were exposed to different temperatures (-10°C, +5°C, +30°C, +40°C, +50°C) and time (30, 60 and 90 min) regimes. Control potato tubers were stored in light, + 18°C and photoperiod of 12 h. Before the test, the tubers were numbered, fixed eyes number on the upper, middle and lower parts of the tubers. After obtaining these conditions it was assessed that germinated eyes were numbered on the upper, middle and lower parts of the tubers. The dynamics of tuber sprout was determined with an interval of 7-14-21 days after high / low temperatures effect, and all seed tubers were analyzed. The present study confirmed that high (+40, +50°C)/low (-10°C) temperatures broke the apical sprout and increasing of the quantity of sprouting eyes.
Introduction. In the human skin exposed to ultraviolet (UV) radiation, melanogenesis occurs in two stages, accompanied by urinary excretion of Thormalen-positive melanogen (TPM). In Poland, no data are available on the course and intensity of melanogonesis in relation to UV exposure in an industrial region. Material and methods. The Thormalen test was used for the collected samples (N=136) as modified by Matous and Suchoń. Results. Maximum environmental TPM content (0.67 μg/dm3) was observed in August. Conclusion. The time of UV exposure and local type of solar radiation promote melanogenesis.
Working time in conditions of exposure to hazardous factors is an important element indispensable for the evaluation of human exposure in the working environment. Agricultural work is accompanied by co-occurrence of many risk factors threatening farmers' health, e.g. dust, elements of the thermal environment, noise, vibration, chemical and biological agents. Biological factors cause diseases with contagious, allergic or immuno-toxic backgrounds which constitute the majority of farmers' occupational diseases registered in Poland. Exposure to hazardous factors in agricultural working environment is due to contact with plants, animals and organic wastes, more precisely - with microbes, plant and animal particles present in aerogenic agricultural dust, as well as pathogens of contagious and invasive diseases present in contaminated soil, water and plants. Data concerning the duration of farmers' exposure to biological and other factors of the working environment were obtained with the use of the Private Farmer Work Chart. Time-schedule observations concerned an annual work cycle. The study covered 30 farms with the following production profiles: plant (Group A), animal (Group B) and mixed production (Group C). The total working time was: in Group A - from 106-163% of the legal working time; in Group B - from 75-147%; in Group C - from 136-167%. Among 48 work activities contributing to the full working cycle among the farmers examined, 15 activities were accompanied by 5 factors. These were mainly field activities which covered plant harvesting and fertilizing, chemical plant protection, as well as cultivation activities. Agricultural dust and elements of the thermal environment were the environmental factors most frequently accompanying agricultural work, followed by contact with biological factors, noise, vibration, and chemical agents. Biological factors are a specific element associated with 19 work activities, mainly the spreading of manure, animal breeding and plant harvesting. Farmers' working time in conditions of exposure to these factors in the group of plant producers was 51% of the total working time on average, among animal breeders - 80% and in the case of mixed production - 77%.
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