[Bastiaan M. (1984) - The Sex Life of Flowers. Facts on File Publishers, New York, pp. 110-111. ]Search in Google Scholar
[Castellanos M. C., Wilson P., Tho m son J. D. (2002) - Dynamic nectar replenishment in flowers of Penstemon (Scrophulariaceae). Am. J. Bo t., 89: 111-118. ]Search in Google Scholar
[Chalcoff V. R., Aizen M. A., Galetto, L. (2006) - Nectar concentration and composition of 26 species from the temperate forest of South America. Ann. Botany, 97(3): 413-421. 10.1093/aob/mcj043280363616373370]Search in Google Scholar
[Crane E., Walker P., Day R. (1984) - Directory of Important World Honey Sources. International Bee Research Association, London, pp. 384. ]Search in Google Scholar
[Ettershank G., Ettershank J. A. (1993) - Tasmanian leatherwoods (Eucryphia spp.): floral phenology and the insects associated with flowers, Tasmanian National Rainforest Conservation Program Report no. 11. Forestry Commission, Hobart. ]Search in Google Scholar
[Farkas Á., Orosz-Kovács Zs. (2003) - Nectar secretion dynamics of Hungarian local pear cultivars. Plant. Syst. Evol., 238: 57-67. ]Search in Google Scholar
[Galetto L., Bernardello G. (2004) - Floral nectaries, nectar production dynamics and chemical composition in six Ipomoea species (Convolvulaceae) in relation to pollinators. Ann. Botany, 94: 269-280.]Search in Google Scholar
[Horváth A., Orosz-Kovács Zs. (2004) - Individual variability of nectar secretion in the flowers of plum cv. ‘Reine-Claude d’Althan. Acta Hortic., 636: 357-363. ]Search in Google Scholar
[Johnson R. A., Wichern D. W. (2007) - Applied Multivariate Statistical Analysis, 6th ed., Pearson Prentice Hall, Upper Saddle River, New Jersey, pp. 773. ]Search in Google Scholar
[Keasar T., Shmida A. (2009) - An evaluation of Israeli forestry trees and shrubs as potential forage plants for bees. IsraelJ. Plant Sci., 57: 49-64. ]Search in Google Scholar
[Khanbash M. S. (2003) - Relationship between the density of Sidir tree Ziziphus spina-christi and honey production. In Preceedings of 3rdArab Beekeepers Association Conference,Tanta Egypt, 28-31 December 2003, pp. 102 -110 (in Arabic).]Search in Google Scholar
[Kim M. S., Kim S. H., Han J., Kang M. S., Park Y. K. (2011) - Honeybee visit and nectar secretion characteristics of the Chinese Hawthorn Crataegus pinnatifida Bunge. J. Apic., The Apicultural Society ofKorea, 26(1): 11-14. ]Search in Google Scholar
[Mačukanović M., Duletić S., Jocić G. (2004) - Nectar production in three melliferous species of Lamiaceae in natural and experimental conditions. Acta Vet. - Beograd, 54(5-6): 475-487. ]Search in Google Scholar
[Mallick S. A. (2000) - Technique for washing nectar from the flowers of Tasmanian leatherwood (Eucryphia lucida Eucryphiaceae). Austral. Ecol. 25: 210-212. doi: 10.1046/j.1442-9993.2000.01010.x.10.1046/j.1442-9993.2000.01010.x]Search in Google Scholar
[Masierowska M. L. (2003) - Floral nectaries and nectar production in brown mustard (Brassica juncea) and white mustard (Sinapisalba) (Brassicaceae) Plant Syst. Evol., 238: 97-107. ]Search in Google Scholar
[Mohr N. A., Jay S. C. (1990) - Nectar production of selected cultivars of Brassicacampestris L. and Brassica napus L. J. Apic.Res., 29(2): 95-100. 10.1080/00218839.1990.11101203]Search in Google Scholar
[Nagy Z. (2002) - Egyre népszerűbb növényünk a facélia III. Méhészet, 50(4): 22 In. Nectar production for the Hungarian Honey Industry. Reviewed by Farkas, A. and Zajácz, E. (2007) Eur. J. Plant Sci. Biotech.. Global Science Book, pp. 125 -151. ]Search in Google Scholar
[NAS (National Academy of Science) (1980) - Fire wood crops, shrub and tree species for energy production. Board on Science and Technology for International Development Commission on International Relations. Washington, D.C.]Search in Google Scholar
[Nepi M., Guarnieri M., Pacini E. (2001) - Nectar secretion, reabsorption, and sugar composition in male and female flowers of Cucurbita pepo. Int. J. Plant Sci., 162: 353-358. ]Search in Google Scholar
[Orwa C., Mutua A., Kindt R., Jamnadass R., Simons A. (2009) - [online] Agroforestree Database: a tree reference and selection guide, version 4.0. http://www.worldagroforestry.org/treedb2/AFTPDFS/Zizyphus_spina-christi.pdf (accessed, December 2011). ]Search in Google Scholar
[Pesti J. (1976) - Daily fluctuations in the sugar content of nectar and periodicity of secretion in the Compositae. Acta Agron. Hung., 25(1-2): 5-17.]Search in Google Scholar
[Petanidou, T., Smets, E. (1996) - Does temperature stress induce nectar secretion in Mediterranean plants? New Phytol., 133: 513 - 518. ]Search in Google Scholar
[Roubik D. W. (1991) - Aspects of Africanized honey bee ecology in tropical America. In: M. Spivak, D. J. C. Fletcher and M. D. Breed (ed.). The African honey bee. Westview Press, Boulder, pp. 259-281. ]Search in Google Scholar
[Scholte P., Khuleidi A. W., Kessler J. J. (1991) - The vegetation of the Republic of Yemen western part. Environmental Protection Council, Agriculture Research Authority, Range and Livestock Improvement Project, Dhamar. ]Search in Google Scholar
[Shenouda R. (2004) - Saudi Arabia’s taste for honey, [online] www.fas.usda.gov/info/agexporter/1998/July%201998/saudi.html, (accessed February 2012). ]Search in Google Scholar
[StatSoft, Inc. (2010) - STATISTICA, version]Search in Google Scholar
[10.0, www.statsoft.com. ]Search in Google Scholar
[Szabo T. I., Najda H. G. (1985) - Flowering, nectar secretion and pollen production of some legumes in the Peace River Region of Alberta, Canada. J. Apic. Res., 24(2): 102-106. 10.1080/00218839.1985.11100656]Search in Google Scholar
[Weast R. (Ed.) (1986) - CRC Handbook of Chemistry and Physics, 67th ed., CRC Press, Inc., Boca Raton, Florida. ]Search in Google Scholar
[Wyatt R., Broyles S. B., Derda G. S. (1992) - Environmental influences on nectar production in milkweeds (Ascelapias syriaca and A. exaltata). Am. J. Bot., 79: 636-642. ]Search in Google Scholar
[Zajácz E., Zaják Á., Szalai-Mátray E., Szalai T. (2006) - Nectar production of some sunflower hybrids. J. Apic. Sci., 50(2): 7-11. ]Search in Google Scholar
[Zsidei B. (1993) - Méhészeti ismeretek. Fazekas és fiai nyomdája, Szarvas, in: Nectar production for the Hungarian Honey Industry. Reviewed by Farkas, A. and Zajácz, E. (2007) Eur.J. Plant Sci. Biotech. Global Science Book, pp. 125 -151.]Search in Google Scholar
