الفهرس 
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Abstract
The present study was conducted during the two successive seasons of 2008/2009 and 2009/2010at the Experimental Station and Laboratory of the Vegetable and Ornamental Plants Dept., Faculty of Agriculture, Mansoura Univ., Egypt, to study the influence of calcium superphosphate at 1.05 and 2.10 g / plant, potassium sulphate at 0.70 and1.40 g / plant, and yeast extract at 1, 2 and 3 g/L as foliar sprays once monthly for three months on tuberose plant. -The aim of this study was to knowledge the effect of phosphorus, potassium and yeast extract on growth, flowering, bulb production and chemical composition of tuberose. This study revealed the following results : 1- The highest value of leaf area (cm2), leaf fresh weight (g) and leaf dry weight (g) obtained in plants treated with yeast extract at 3g/L, calcium superphosphate1.05g/plant and potassium sulphate 0.70g/plant. 2- The length of flowering part (cm) and number of florets/ spike increased by treating plants with yeast extract at 3g/L, calcium superphosphate 1.05g/ plant and potassium sulphate 0.70g / plant. 3- Thus, it may be concluded that spraying tuberose plants with yeast extract (3g/L), add ground calcium superphosphate (1.05g) and potassium sulphate (0.70g / plant) once monthly for three months induced the best vegetative growth and flower quality and economically saved about half the recommended doses of phosphorus and potassium fertilizer.