Two field experiments were conducted at Sakha Agricultural Research Station, Kafr El-Sheikh Governorate, during the two successive seasons 2012/2013 and 2013/2014. The investigation was aimed to maximize water productivity by intercropping onion on sugar beet through investigate the effect of irrigation and intercropping treatments on onion and sugar beet yield, yield components, quality and some water relations in the North Middle Nile Delta region (31 0 07ˉ N Latitude and 30 0 57ˉ E longitude with an elevation of about 6 metres above mean sea level). The experimental design was split plot with three replicates, the main plots were randomly assigned by three irrigation treatments, I1 (irrigation with 0.8 Ep), I2 (irrigation with 1.0 Ep) and I3 (irrigation with 1.2 Ep), while sub main plots were also randomly assigned by intercropping treatments, D1 (Intercropping onion with sugar beet by planting sugar beet as in pure stand and planting one row only of onion on the back of bed as in pure stand), D2 (Intercropping onion with sugar beet by planting sugar beet as in pure stand and planting two row only of onion on the back of bed as in pure stand), D3 (Intercropping onion with sugar beet by planting sugar beet as in pure stand and planting three row only of onion on the back of bed as in pure stand), D4 (pure stand of sugar beet was planted in bed 120 cm width, spaced 20 cm between hills on both sides of beds to give 35000 plants/ fad.) and D5 (pure stand of onion with planted in rows on the back of bed, 120 cm width, 15 cm between rows and hills). The main results can be summarized as follows: The highest values for water applied (Wa) and consumptive use (Cu) were recorded under irrigation treatment I3 and the values are 69.03 cm. (2899.41 m 3 /fed.), 73.23 cm. (3075.55 m 3 / fed.) for Wa and 41.26 cm. (1733.13 m 3 /fed.) and 42.25 cm. (1774.55 m 3 / fed.) for Cu in the first and second growing seasons, respectively. Meanwhile, the lowest overall mean values for Wa and Cu were recorded under irrigation treatment I1 and the values are 60.89 cm. (2557.33 m 3 /fed.) and 34.84 cm (1463.26 m 3 /fed.) for Wa and Cu, respectively. For intercropping treatments, didn't have any effect on Wa but for Cu, the highest mean values were recorded under D4. On the other hand, the lowest recorded under D5. Generally, the values of Cu can be descended in order D4 > D3 > D2 > D1 > D5 in the two seasons. The highest values for water productivity (WP) and productivity of irrigation water (PIW) were recorded under I2 and the values are 23.3 and 22.3 kg/ m 3 for WP and 10.3 and 9.3 kg/ m 3 for PIW in the first and second growing seasons, respectively. Meanwhile, the lowest mean values were recorded under I3 and the values are 18.4 and 17.7 kg/ m 3 for WP and 8.5 and 8.0 kg/ m 3 for PIW in the first and second growing seasons, respectively. For consumptive use efficiency (Ecu), the highest values were recorded under I3 and the values are 45.98 and 44.69% but the lowest were recorded under I1 and the values are 42.86% and 40.38% in the...
The present study was carried out at Sakha Agricultural Research Station, Kafr El-Sheikh, Governorate during the two successive seasons 2006 and 2007 to investigate the effect of three irrigation intervals i.e. one, two and three weeks on the productivity and some water relations of sunflower. A slit plot design with three replicates was used. The main plots were assigned to the irrigation intervals, while the sub-plot were devoted to irrigation levels i.e. irrigation till field capacity plus 10%. In addition, three other levels based on Ibrahim, Hargareves and FAO Peman-Monteith equations. Results could be summarized as follows:Irrigation every 7 days significantly increased stem and head diameter, the weight of 100 seed, oil content and seed yield. Irrigation according to Ibrahim equation was superior in stem and head diameter, oil content and seed yield. Irrigation every one week according to Ibrahim equation was resulted in the highest seed yield of s1348.53 kg/fed. (mean of 2 season).
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