Potential of Plant Growth Promoting Rhizobacteria on Growth of Potato (Solanum tuberosum L) under Field Condition

Abstract

This research was conducted to use different types of Plant Growth Promoting Rhizobacteria (PGPR)which included (Rhizobium,Azotobacter and Asospirillum sp.) as single or mixed biofertilizer for two biovar of potato crop (white Arnova (A) and red Manitou (B)) in Latefia research station. Field with 29m × 40m (length× width) was prepared at al- Latefea Research Station, during spring season. Soil was sleeked and permutated by machine, lines each 4m were chapped and prepared for culturing. The tubers of potato were soaked into Azotobacter spp., Azosperillium spp., Rhizobium spp. culture separtory and in corbination ; treated potato were ground under soil. Germination percentage, chlorophyll content and yield weight were analyzed for comparsion between these treatments. Germination results that percentage for Arnova class in Rhizobium spp.100%, Azotobacter spp.100%, could replace chemical fertilizer formula. Manitou class augmented with Azospirillum spp. gave the best germination percentage 96.7% While, Potato treated with Rhizobium spp. culture gave the highest weight in compassion with chemical fertilizer and other treatments, it was 6.283gm. On other hand, mixed culture of Rhizobium spp., Azotobacter spp. and Azosperillium spp. could replace efficiently the recommended formula of chemical fertilizer, the mean of weight became 5.6 gm. Chlorophyll content in Arnova and Manitou did not any change as compaied to control treatment, the application of biofertilizer with bacterial culture of Azosperillum sp. gave 49.77 followed by mixed culture Rhizobium spp3and Azosperillium spp1it was 48.37.