LUCRÄRI ÅTIINÅ¢IFICE SERIA AGRONOMIE

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Universitatea de Ştiinţe Agricole şi Medicină Veterinară Iaşi BIBLIOGRAFIE 1. Babiciu, P., Scripnic, V., Frăţilă, Al. Sisteme hidraulice ale tractoarelor şi maşinilor agricole, Editura CERES, Bucureşti, 1984 2. Ionescu, Fl., Catrina, D., Dorin, Al., Mecanica fluidelor şi acţionări hidraulice şi pneumatice, Editura Didactică şi Pedagogică, Bucureşti, 1980. 3. Catalog KRAMP (SC LYRA SRL) 4. Hydraulic Komponenten Katalog 2007- HANSA FLEX 5. Mobil hidraulic komponenten, Mannesmann-Rexroth, RD 64001/11.86, Ersetzt 4.85 6. PVG 32, Proportional Valves, Tenical information, SAUER DANFOSS 7. Trading, service & engineering for hydraulics & pneumatics, LYRA, CD. 10
Lucrări Ştiinţifice – vol. 51, seria Agronomie INFLUENCE OF THE CLIMATIC FACTORS ON THE MELLIFEROUS CHARACTERISTICS OF THE SUNFLOWER HYBRIDS V. ION 1 , Nicoleta ION 2 , V. ŞTEFAN 1 , G. FOTA 2 , R. COMAN 2 1 University of Agronomic Sciences and Veterinary Medicine of Bucharest viorelion@yahoo.com 2 Apiculture Reseacrh and Development Institute of Bucharest, ionnicoleta2006@yahoo.com In the present paper, there is presented the influence of water and temperature factors on the melliferous characteristics on different sunflower hybrids, respectively on nectar secretion of flowers, nectar concentration in sugar, glucidic index (the produce of nectar secretion and nectar concentration in sugar), honey yield, and period and duration of the flowering process. In view to establish the influence of the climatic factors on the melliferous characteristics on the sunflower hybrids, there were used the experimental data of researches carried out along the time by the specialists from Faculty of Agriculture - University of Agronomical Sciences and Veterinary Medicine of Bucharest and Melliferous Resources Laboratory - Apiculture Research and Development Institute of Bucharest. Also, there are presented the data obtained within some field experiments with sunflower hybrids carried out in the period 2006-2007 by specialist of both institutions presented above. Key words: Sunflower, climate, factors, melliferous, characteristics The surfaces cultivated with sunflower in Romania have registered an increased trend after 90’s years, this being one of the crops which kept a great interest from the farmers. In the same time with this great interest from the farmers, the beekeepers are also very interested about sunflower, especially about the specific melliferous characteristics of the hybrids. That is due to the fact that in Romania, the sunflower represents the most important melliferous plant among the field crops even by the period and duration of flowering or by the large number of flowers and nectar secretion. But, the melliferous potential of the sunflower hybrids is depending on the climatic factors, this been observed by the beekeepers in the form of a great variation in time and space of the honey yield for the same sunflower hybrids. Among the climatic factors, the water (rainfall) and temperature are the most important, these having a significant influence on the melliferous potential of the sunflower hybrids, as well as on the moment and duration of the flowering process. 11
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LUCRÄRI ÅTIINÅ¢IFICE SERIA AGRONOMIE

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LUCRÄRI ÅTIINÅ¢IFICE SERIA AGRONOMIE