Effect of irrigation intervals and nitrogen rates on forage sorghum under North Sinai conditions [electronic resource].

Includes reference.

This experiment was carried out at the Experimental Farm of the Faculty of Environmental Agricultural Sciences, Suez Canal University in El-Arish, during 2006 and 2007 seasons. This work aimed to study the effect of irrigation intervals (3, 5 & 8 days) and nitrogen fertilizer rates (45, 60, 75 & 90 kg N fed⁻¹) on forage sorghum (Sorghum bicolor). Nitrogen fertilizer (Urea 46%) was applied in three equal doses (20 days after emergence, after the 1st and the 2nd cuts). The experimental design was randomized complete block (RCBD) in a split plot design with three replications. The main plots were chosen for irrigation intervals, the sub-plots were devoted for nitrogen rates. Drip irrigation system was used with saline ground water (ranged between 3500 to 4600 ppm) pumped from a local well. Three cuts were taken throughout the growth season at 60,105 and 136 days after sowing. All studied growth criteria had the highest values with irrigation every 3 days at all cuts in both seasons and combined analysis.

Summary in Arabic.

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