NITROGEN FERTILIZER REQUIREMENTS OF STEVIA REBAUDIANA BERTONI, UNDER EGYPTIAN CONDITIONS | ||
| Egyptian Journal of Agricultural Research | ||
| Article 17, Volume 79, Issue 3, September 2001, Pages 1005-1018 PDF (4.17 M) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/ejar.2001.320014 | ||
| Authors | ||
| ABDEL-WAHAB I. ALLAM; AHMED M. NASSAR; SAMER Y. BESHEIT | ||
| 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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