Effect of Irrigation Management and Nitrogen Fertilizer on Yield and Water Use Efficiency and Estimated Yield Function of Common Bean (Case Study: Astaneh Ashrafiyeh)

the effect of irrigation intervals and nitrogen fertilizer on yield¡ water use efficiency (WUE) in Common bean¡ Were examined in the year 2011 at Astaneh Ashrafiyeh in east of Guilan province. In this study nitrogen fertilizer levels included 0¡ 30¡ 60 and 90 kg/ha Were examined in condition no irrigation¡ irrigation intervals 6¡ 12 and 18 days.The results showed that irrigation intervals and nitrogen fertilizer was effective on yield. 6 day irrigation interval and 60 (kgN/ha) with seed yield of 3486.5 (kg/ha) was the highest. Also the effect of management irrigation and nitrogen fertilizer were significant on weight of 100 seeds¡ number of pods per plant¡ number of seeds per plant¡ pod length and Water Relative Leaf (RWC). The water use efficiency was varied from 0.71 to 1.37 kg/m3. According to the result¡ 6 days irrigation interval and fertilizer amount of 60 kg N/ha was the optimum irrigation regime and nitrogen level.