The role of zeolite and their integrated Azospirillum and Azotobacter inoculation and different levels ofchemical nitrogen fertilizer under irrigation management on increasing yield and water use effi

ABSTRACT: In order to determine effects of zeolite and their integrated bio-fertilizer and different levels of chemical nitrogen fertilizer under irrigation management on increasing yield and water use efficiency in peanut, a field experiment was conducted using factorial split-plot in randomized complete block design with three replications in 2010 growing season Astaneh Ashrafiyeh, North of Iran. In this study main plot consist of water regimes (W1=dry land and W2=12 day Interval Irrigation) and sub factor consist combination zeolite (Z1= 0 and Z2=7 ton/ha) and integrated bio-fertilizer and different levels of chemical nitrogen fertilizer (N1=0, N2= Azospirillum + Azotobacter, N3= 30 kg N/ha+ Aazospirillum + Azotobacter, N4= 60 kg N/ha+ Aazospirillum + Azotobacter and N5= 30 kg N/ha+ Aazospirillum + Azotobacter) was performed. The results of this investigation showed that all traits significantly were affected by irrigation, zeolite and integrated bio-fertilizer and different levels of chemical nitrogen fertilizer. The results of this investigation showed that all traits (seed yield, pod yield, biomass yield, water use efficiency based on seed, water use efficiency based on pod and water use efficiency based on biomass) significantly were affected by irrigation, zeolite and integrated bio-fertilizer and different levels of chemical nitrogen fertilizer. The highest seed yield were found to 12 day interval irrigation (2561 kg/ha), application 7 ton/ha zeolie (2726 kg/ha) and application 30 kg N/ha+ Aazospirillum + Azotobacter (2345 kg/ha). The highest water use efficiency based on seed were found to 12 day interval irrigation (1.88 kg/m3), application 7 ton/ha zeolie (1.73 kg/m3) and application 30 kg N/ha+ Aazospirillum + Azotobacter (2.03 kg/m3).