Chemical evaluation of some stevia (Stevia Rebaudiana, bertoni) varieties of under different nitrogen fertilization levels [electronic resource]
التقيم الكميايئ لبعض اصناف الاستيفيا تحت مستويات مختلفة من التسميد الازوتي
- p.285-292.
Includes bibliographic reference
Two field experiments were carried out at agricultural research center, Giza; Egypt during 2015/2016 and 2016/2017 seasons to study the effect of nitrogen fertilizer levels (20, 30 and 40 kg N/ fed/cut.) on some stevia varieties (china I, Egy I, spanti and shou2). The highest nitrogen rate of 40 kg. N /fed /cut was significant in all studied yield andChemical characters and gave the highest values of stevioside%. recorded (6.09 and 6.62%), ,rebaudioside A% ( 7.23 and 8.04%), Stevioside kg /fed ( 238.9 and 286.1 kg) and rebaudioside A kg /fed (287.2 and 350.5 kg)}, respectively as compared with the other two nitrogen treatments in both seasons. Stevia Varieties were significantly different in all studied yield characters. china I Varieties gave the highest values ofstevioside% (6.83 and 7.34 %), rebaudioside A% ( 8.44 and 9.26 %}, rebaudioside A kg /fed(300.8 and 363.2 kg), respectively ofall studied yield and chemical characters except for dry leaves yield kg/fed where EgyI varieties gave the highest values in the first and second seasons . . Concerning the effect of the interaction between nitrogen fertilizer levels and stevia varieties on yield and chemical characters, nitrogen fertilizer level of 40 kg NI fed/cut applied to china I varieties gave the highest values in all studied yield and chemical composition except for dry leaves yield (kg/fed) where EgyI varieties and nitrogen fertilizer level of 40 kg N/fed/cut gave the highest values in the first and second seasons.