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Ten field experiments were carried out in Giza-Egypt during 2018/2019 and 2019/2020 seasons to elucidate the performance and extent of variation of some faba bean varieties to broomrape infestation under wide range of environmental conditions as sowing dates. During each season, five trials as sowing dates of 2018/2019 started on October 28, 2018, in two weeks interval, but those of second season (2019/2020) begun with October 17, 2019. In each trial, ten faba bean genotypes having different degrees of reaction to Orobanche infestation were used. The sowing date (SD) in both seasons affected significantly all the studied traits except podded hosts % and Orobanche tolerance index (TI) in 2nd season. Host genotypes (G) in 1st season, varied highly significantly for all traits except harvest index (HI), whereas in 2nd season, only the numbers of days to seedling emergence (DE) was affected significantly. The studied faba bean genotypes performed differently over and across the dominated climatic conditions of first season, whereas in the 2 season for days to emergence (DE) was only significance. The accumulated growing degree days (GDD) at Orobanche appearance was higher in all sowing dates of faba bean in the second season than those in the first season gradually decreased due to late sowings. The onset of faba bean plant flowering and podding occurred earlier by increasing GDD after completing seedling emergence, but seedling emergence seems to be affected by soil temperature and moisture rather than air temperatures. The rates of change of phonological stages due to increasing GDD are in harmony to the correlation coefficients with variable magnitudes which indicates that required thermal units for faba phonological developments seemed to be variable. Faba seed yield fluctuated seemed to be more sensitive than dry matter production to environmental conditions and broomrape infestation. The interrelationships between the broomrape infestations either number or dry weight with other host traits varied in signs and significance from season to another and also due to sowing dates. Environmental conditions that resulted in late seedling emergence or higher percentages of harvest index and higher broomrape tolerance index will be reflected in higher magnitudes of variations among varieties. Conditions that beared of higher magnitudes of variation in faba flowering, faba dry wt, Orobanche dry wt and podded host% will be impacted in early flowering dates, lower production of dry matter, lower broomrape infestation level and reduce pod bearing hosts%, respectively. However, the conditions of enhanced late onset of podding and broomrape appearance as well as higher seed yield of hosts will be expected to broaden variations among genotypes. The magnitudes of genetic variation under first season are much higher under first season than those recorded in the second one for all studied traits except HI. Also the genetic variation was lacking in the 2019/2020 season for DOA, FDwtR and TISY. The heritability varied greatly in magnitude among seasons and traits, but in general the higher estimates may be considered medium percentages. These results specify that there is significant genetic variation present in these traits to guarantee selection for better performance. These traits can therefore be given special consideration for selections aimed at faba bean improvement.

PERFORMANCE AND VARIATION OF SOME FABA BEAN GENOTYPES TO BROOMRAPE INFESTATION AND ENVIRONMENTAL CONDITIONS