الفهرس 
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Abstract
This study was carried out during two consecutive seasons of 2007 and 2008 on 75 8-years old cane trained Crimson seedless grapevines. The selected vines are grown in sandy soil and planted at 2 x 3 meters apart (670 vines in one fed.)
The scope of the present study was examining the effect of different concentrations and frequencies of Seaweed and Algae extract as possible mean to improve growth, vine nutritional status as well as yield quantitatively and qualitatively of Crimson seedless grapevines. The effect of the present treatments on improving berry setting and alleviating the problem of uneven colouration of berries in the cluster was also concerned.
The present study included twenty- five Seaweed and Algae extract treatments from two factors (A & B ).
The best results with regard to yield and quality of Crimson seedless grapevines were obtained when Seaweed and Algae extract was sprayed four times ( at growth start, first bloom, just after berry setting at 21 days later) at 0.2% beside the normal horticultural practices that already applied in the vineyard. Such promised treatment was also accompanied with improving berry setting, controlling uneven colouration of clusters and improving local and foreign marketing of such grape cv.