Glasnik Zaštite Bilja, Vol. 27 No. 5, 2004.
Izvorni znanstveni članak
Effects ofgenotype and growing conditions on several parameters of sunflower attractiveness to bees
Vladimir Miklić
; Naučni institut za ratarstvo i povrtarstvo, Novi Sad
Jovanka Atlagić
; Naučni institut za ratarstvo i povrtarstvo, Novi Sad
Zvonimir Sakač
; Naučni institut za ratarstvo i povrtarstvo, Novi Sad
Nenad Dušanić
; Naučni institut za ratarstvo i povrtarstvo, Novi Sad
Jovan Joksimović
; Naučni institut za ratarstvo i povrtarstvo, Novi Sad
Dragutin Mihajlović
; Poljoprivredni fakultet, Novi Sad
Sažetak
Analyzed in the paper were the effects of genotype, fertilizer application and microclimate on nectar production and availability, bee attendance and sunflower seed yields. Four sunflower hybrids (Velja, NS-H-45, NS-H-111 i NS-H-702) and four fertilization treatments were analyzed. Disc flower corolla length and nectar content were studied in the hybrids and their parent lines. The monitoring of bee visitation at flowering was done on nine occasions every day. Nectar content and seed yield per head were determined. Weather conditions were also recorded at observation time. The flower nectar content differed significantly among the genotypes, ranging from 2.53 mg/20 flowers (Velja) to 15.57 mg/20 flowers (Ha-98B). The highest nectar content (7.36 mg/20 flowers) was found in the control treatment and the lowest (6.67 mg/20 flowers) in the 100:100:100 treatment. The largest bee attendance was recorded in NSH- 111 and the 150:150:150 treatment and the lowest in Velja and the 100:100:100 treatment. Corolla length in the treatments ranged from 9.11 mm (control) to 9.23 mm (100:100:100), while in the genotypes it ranged between 7.95 mm in Ha-26B and 11.14 mm in CMS-3-8B. The longest corollas were found in flowers whose pistils had not yet emerged (9.51 mm). Significant differences in yield were found among the hybrids as well as treatments. Bee attendance peaked at 25oC air temperature and 43.5% relative humidity. Bee presence was at its highest at 9.00 h.
Ključne riječi
sunflower; nectar; corolla length; bee visitation; weather conditions; fertilization; seed yield
Hrčak ID:
164406
URI
Datum izdavanja:
22.9.2004.
Posjeta: 1.105 *