الفهرس 
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Abstract
This study was carried out at the Experimental Farm of Rice Research and Training Center, Sakha Kafrelsheikh,Egypt during 2019 rice growing seasons. The experimental material of the present study comprised eight parents, namely; Giza 178, Giza 179, Sakha 106, Sakha 107, Sakha 108 IET1444, WAB 1573, and NERICA4 with diverse pure and elite genotypes of rice.
In 2018 season, the above mentioned rice genotypes were planted in three successive dates of planting with ten days intervals in order to overcome the differences in their flowering time. Thirty days old seedlings of each parent were individually transplanted in the permanent field in ten rows. Each row was 5 m long and contained 25 hills. At flowering time, a crossing program with all possible combinations among the eight parental genotypes excluding reciprocals was carried out.
In 2019 season, the seeds of parents and their F1 hybrids were sown in dry seedbed and thirty days old seedlings were transplanted individually in the field plots. Moreover, thirty six entries (8 parents and 28 F1 crosses) were evaluated in two separate irrigation experiments, the first experiment (normal condition) was irrigated every 4 days (6000 m3 /fed), and the plots of this experiment were kept saturated with water from transplanting up to two weeks before harvesting. However, the second experiment (water deficit) was irrigated every 10 days (3800 m3/fed). The two experiments were designed in randomized complete blocks with three replications.