ALLAM, A., NASSAR, A., BESHEIT, S. (2001). NITROGEN FERTILIZER REQUIREMENTS OF STEVIA REBAUDIANA BERTONI, UNDER EGYPTIAN CONDITIONS. Egyptian Journal of Agricultural Research, 79(3), 1005-1018. doi: 10.21608/ejar.2001.320014
ABDEL-WAHAB I. ALLAM; AHMED M. NASSAR; SAMER Y. BESHEIT. "NITROGEN FERTILIZER REQUIREMENTS OF STEVIA REBAUDIANA BERTONI, UNDER EGYPTIAN CONDITIONS". Egyptian Journal of Agricultural Research, 79, 3, 2001, 1005-1018. doi: 10.21608/ejar.2001.320014
ALLAM, A., NASSAR, A., BESHEIT, S. (2001). 'NITROGEN FERTILIZER REQUIREMENTS OF STEVIA REBAUDIANA BERTONI, UNDER EGYPTIAN CONDITIONS', Egyptian Journal of Agricultural Research, 79(3), pp. 1005-1018. doi: 10.21608/ejar.2001.320014
ALLAM, A., NASSAR, A., BESHEIT, S. NITROGEN FERTILIZER REQUIREMENTS OF STEVIA REBAUDIANA BERTONI, UNDER EGYPTIAN CONDITIONS. Egyptian Journal of Agricultural Research, 2001; 79(3): 1005-1018. doi: 10.21608/ejar.2001.320014
NITROGEN FERTILIZER REQUIREMENTS OF STEVIA REBAUDIANA BERTONI, UNDER EGYPTIAN CONDITIONS
Sugar Crops Research Institute, Agricultural Research Center, Giza, Egypt
Abstract
Field trail was carried out during 1998 to 2000 at Giza Experi-mental Station (ARC), to find out the suitable nitrogen rate and cutting time that would insure optimum stevia yields and stevioside content. Three nitrogen rates (10, 20 and 30 Kg N/F) and ten cutting times (from July 1998 at a two month interval up to Feb. 2000). Results showed a gradual and significant increase in fresh and dry leaves, stern, biomass yields, total soluble carbohydrate and stevioside, over and within cuts as nitrogen fertilizer increased up to 30 Kg N/F. Dry leaves yield and stevioside content (represent stevia eco-nomic yield and quality) increased by 64% and 1.99% at 30Kg N/F as compared to 10 Kg N/F. All studied traits showed significant increase in all successive cuts, but they manifested a remarkable increase during the summer cuts and surpassed those during winter cuts. These results give evidence that climate conditions such as tem-perature, length and intensity of photoperiod greatly affected stevia ec-onomic production and quality parameters more than successive cuts . The interaction between nitrogen fertilizer levels and cutting time significantly affected most studied traits. The highest dry leaves yield/F and leaves stevioside content were obtained from summer cuts fertilized with 30 Kg N/F.
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