ملخص البحث
This investigation was carried out during 2010 and 2011 seasons on Gladiolus hybrida cv." Sancerre" grown in 25 cm diameter clay pots at a commercial nursery, in Damanhour city, El-Beheira
governorate, Egypt. The aim of this work was to study the effects of different levels of ammonium nitrate (33.5% N) at rates of (zero, 2, 4, 6 g/ plant) as a source of nitrogen and diphenylamine (98%) at rates of
(zero, 100, 150, 200 ppm) as a source of amino acid on the vegetative growth, flowering, corms production and chlorophyll contents of Gladiolus (Gladiolus hybrida cv. "Sancerre"). From the obtained results it was
concluded that treating gladiolus plants with ammonium nitrate at 6gm/plant and diphenylamine at 150 ppm improve the vegetative growth, flowering characteristics, corms production and total chlorophyll contents in
the leaves of Gladiolus plants.