RESPONSE OF PEANUT (ARACHIS HYPOGAEA L.) TO THEIR INTEGRATED BIOFERTILIZER, CHEMICAL NITROGEN FERTILIZER AND PLANT DENSITY

In order to determine response of peanut to their integrated biofertilizer, chemical nitrogen fertilizer and plant density, a field experiment was conducted using factorial in randomized complete block design with three replications in 2012 growing season at Astaneh Ashrafiyeh, North of Iran. The factors of experiment consisted of plant density (20×20 cm, 30×30 cm and 40×40 cm) and different levels of chemical nitrogen fertilizer (N1=0, N2= Azospirillum + Azotobacter, N3= 30 kgN/ha + Aazospirillum + Azotobacter, N4= 60 kgN/ha + Aazospirillum + Azotobacter and N5= 90 kgN/ha + Aazospirillum + Azotobacter). The results of this investigation showed that seed yield, pod yield and biomass yield traits were significantly affected by integrated bio-fertilizer and different levels of chemical nitrogen fertilizer and plant density. The highest seed yield were found in 40×40 cm plant density (1604 kg/ha) and application of 30 kg N/ha + Aazospirillum + Azotobacter (1751 kg/ha). The highest pod yield were found at 40×40 cm plant density (2748 kg/ha) and on application of 30 kg N/ha + Aazospirillum + Azotobacter (3006 kg/ha). The highest pod yield were found at 40×40 cm plant density (10500 kg/ha) and on application of 90 kg N/ha + Aazospirillum + Azotobacter (10788 kg/ha).