الفهرس 
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Abstract
The present study was carried out during two consecutive seasons of 2013/2014 and 2014/2015 at the Nursery Faculty of Agriculture, Minia University. The subjective of the present work was focused on investigation the response of Gladiolus grandiflorus cv. Blue Frost plants to different fertilization treatments (compost at 10 ton/fed, mineral NPK fertilization at 50, 75 100 % of the recommended dose and EM (as biofertilizer containing effective microorganisms) at 25, 50 and 75 % of the stock mixture and two antioxidants i. e. mixture of amino acids at 50, 100 and 200 ppm and extract of seaweeds at 75, 150 and 300 ppm, as well as, the interaction between these treatments. The layout of the experiment was randomized complete blocks in a split plot design with three replicates. The four organic and mineral NPK fertilization treatments were considered as main plots, while, the ten levels of antioxidants and EM were occupied the sub plots.
A significant response of the flowering aspects of gladiolus plants to organic and non-organic fertilization treatments was detected in the first and second seasons. In this regard, number of days from planting to flowering was significantly reduced due to the application of mineral NPK fertilization at 100 % of RD followed by the compost treatment in the two growing seasons.
The obtained results revealed that supplying the gladiolus plants with the highest level of mineral NPK fertilization (100% of RD) followed by the application of compost resulted significantly in the largest and heaviest weights of corms, as well as, the highest number and heaviest weights of cormels/plant comparing to other fertilization treatments 50 or 75% of the RD, whereas, no significant differences between the values due to the compost and 100 %NPK (RD) application were recorded in the two seasons except that of corm fresh weights.
Recommendation:
It might be recommended in order to produce the best quality and quantity of spikes, flowers and maximum corm and cormels production of Gladiolus grandiflorus cv. Blue Frost plants to fertilizing the plants with recommended dose (100%) of mineral NPK and treating the plants with the mixture of amino acids at 200 ppm or with the extract of seaweeds at 300 ppm.
Also, from the environmental and economic point of view to using an organic fertilizer (compost at 10 ton/fed) plus the amino acid mixture at 200 ppm or plus the seaweeds extract at 300 ppm, whereas, no significant differences between the values resulted from the application of the organic and inorganic fertilization treatments were found.