THE PRODUCTION LEVEL OF SOME SUNFLOWER HYBRIDS FROM THE NEW GENERATION, CULTIVATED IN WEST AREA OF ROMANIA, WITH HOVEYBEES AS POLLINATORS PUBLISHED

Alin JIVAN, Valeriu TABĂRĂ, Antonina RIŞCU (JIVAN)
The researches represent a novelty in the field, since there have been no other recent researches that would accurately present the special contribution that bees have on pollinating the sunflower crop. High-performance hybrids analyzed in terms of 2012 showed good yields of sunflower of over 3.400 kg/ha. The high-performance sunflower hybrids, given that the critical flowering stage is helped by bees, make very high yields of over 5.000 kg/ha. Additional bee pollination was good for sunflower in 2012, all analyzed hybrids showed yield increases ranging from 10-20%. The purpose of this paper is to emphasize the major contribution that bees have in sunflower crop pollination. All hybrids, currently existing on the Romanian market, need in their blossoming stage additional bee pollination. The varieties of cultivated sunflower were from companies Syngenta hybrid Brio and Neoma, Caussade Semences hybrid Imeria and Dalia and Pioneer with hybrids PR64LE19 and PR36A90. Sowing date was within the range 02-IV.2012 and 02.V.2012. The plant generally used in the pre-planting period was wheat, but in Cenei locality at two varieties (PR36A90 and Imeria) corn was used. In the reference area, beekeepers located bee colonies for crop pollination, different in number. Likewise, the strength of these bee families was different. Following these observations, we wanted to study the effectiveness of pollination by bees with every commercial hybrid in part, and finally the sunflower production was determined for each hybrid in all localities where research was conducted. The notable difference between the numbers of bee families used as pollinators in the localities studied made the sunflower production fluctuating within the same hybrid researched. In the case of hybrid Dalia CS in Sandra locality with a number of 120 bee families, there was a yield of 3.000 kg/ha, and in locality Cenei at a number of 350 bee families, there was a yield of 3.400 kg/h
bee families, pollen, sunflower, hybrids, yields
Presentation: oral

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