Two field experiments were conducted in naturally infested fields with
broomrape (Orobanche crenata Forsk.) at Sids Agricultural Research Station, Beni
Souif govemorate during two successive seasons 2000101 and 2001102 to study the
effect of both number of irrigations at two, four and six weeks intervals and glyphosate
(Roundup) application at 6 & 8, 8 & 10, 6 & 8 & 10 and 7 & 10& 13 weeks after SOwing
on controlling broomrape, yield and its components in faba bean (Vicia faba L.).
Results revealed that irrigation after two weeks interval followed by four weeks
intervals caused decreasing on number and dry weight of broomrape by 57.9 & 35.7%
and 28.1 & 14.2% in 2000/01 season and 24.2 & 11.5% and 17.9 & 5.9% percent in
2001/02 season, respectively, as compared with six weeks intervals. The same
treatment gave the highest values for plant height, number of branches/plant, number
of pods/plant, weight of pods/plant, seed weighUplant and seed yield (ardabJfed.) in
both seasons. Irrigation for two and four weeks mtervats increased signiflC3ntly seed
yieldJfed. by 10.2 and 1.6% & 15.4 and 7.8%, respectively, in both 2000/01 and
2001102 seasons compared with irrigation at six weeks intervals. All broom rape control treatments decreased significantly number and dry
weight of broomrape spikes and increased significantly plant height. number of
branches/plant, number of pods/plant, weight of pods/plant, seed weighUplant and
seed yield (ardab/fed.) in both 2000/01 and 2001/02 seasons. The highest reduction
percentage on number and dry weight of broornrape spikes obtained by glyphosate at
three times 7 & 10 & 13 were 99.2 & 98.9% and 98.3 & 99.1%, respectively, in
2000101 and 2001102 seasons as compared with untreated plots. For seed yield
(ardab/fed.) the same treatment gave increases by 56.9 and 266.7%, respectively, in
both seasons as compared with untreated treatment. The interaction between both times of irrigation and glyphosate application
was significantly decreased number and dry weight of broomrape spikes and this
reflected on yield and its components. These results indicate that heavy infested soil
with broom rape it is possible to irrigate at two weeks intervals and spray glyphosate
three times to get rid of broomrape injury in faba bean.