اثر سيستم‌هاي مختلف آبياري و مقادير كود نيتروژن بر عملكرد و كارايي مصرف آب آبياري چغندرقند

Impacts of different irrigation systems and nitrogen fertilizer on yield and water use efficiency of sugar beet

This research was carried out to evaluate the effects of irrigation methods and N fertilizer rates on the quantity and quality of sugar beet in Ekbatan research station during 2001 and 2002. Experiment was performed in split-plot with 3 replications and 15 treatments. Treatments included 3 irrigation systems: sprinkler (solid set) furrow (hydroflum) and drip (tape: 508-20- 500) in main plots and 5 N fertilizer rates: 0(control) 60 120 180 240 N kgha-1 in sub plots. The combined analysis of the data showed that differences among N rates were significant (P0.01) for root, sugar and white sugar yield. The effects of irrigation systems on root (P
0.01) and white sugar yield (P0.05) were significant: N fertilizer rates significantly affected IWUE (P0.01), but interaction between irrigation systems and N fertilizer rates were not significant on IWUE. IWUE was decreased in drip (tape) sprinkler and furrow respectively. Water consumption decreased averagely 45.8% and 36.8% in drip irrigation as compare to furrow and sprinkler irrigation respectively. Water consumption in sprinkler irrigation was 22.2% less than that in furrow irrigation.