الفهرس 
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Abstract
Two field experiments were conducted at the Experimental Station, Faculty of Agriculture, Mansoura University, during the two successive winter seasons of 2009/2010 and 2010/2011. The main objectives of this study were to determine the effect of sowing dates (1st Sept., 1st Oct. and 1st Nov.), nitrogen fertilizer levels (40, 60 and 80 kg N/fed) and times of foliar application with Melagrow as natural growth promoter (without, one and two times) on growth and yields of safflower cv. Giza 1. The obtained results could be summarized as follows::
1. Intermediate sowing date of safflower (1st October) significantly surpassed other sowing dates (1st September and 1st November) in all studied characters, except CGR, RGR and NAR which produced from sowing on 1st September in both seasons.
2. Fertilizing safflower plants with 80 kg N/fed significantly increased all studied characters and markedly recorded the highest values of these characters in both seasons. However, application of 40 kg N/fed produced the lowest values of all studied characters in the two growing seasons.
3. Foliar application with Melagrow as a natural growth promoter twice after 30 and 70 days from sowing significantly recorded the highest values of studied characters, exclusion leaves/stem and branches ratio, CRG, RGR and NAR in both seasons. Whilst, application of Melagrow one time after 30 days from sowing came in the second rank in this respect in both seasons. On the other hand, the lowest values of all growth and petal yield characters were resulted from the control treatment (without foliar application) in both seasons.
from the obtained data in this study, it can be concluded that sowing safflower on 1st October and mineral fertilizing with 80 kg N/fed beside twice foliar application with Melagrow as a natural growth promoter in order to maximizing its growth and yields under the environmental conditions of Dakahlia Governorate, Egypt.