Efficiency use of EM and PGPR inoculation on sugar beet plants under different fertilization levels

ABSTRACT

The efficiency use of EM [Japanese bio-product] in relation to a local bacterial inoculum [PGPR] in improving sugar beet yield and quality in addition to increase of net profit [L.E./fed] was the aim of the present investigation. Seeds were treated with 1- EM, [effective microorganisms], 2- Combined inoculum contained Azotobacter chroococcumn and Bacillus megaterium bacteria., PGPR, [biofertilizer prepared in Sakha Agricultural Research Station. Microbiology Lab.], 3- Inoculation with the mixture of the two inoculants. These treatments applied along with 50% or 75% of recommended dose of nitrogen compared to traditional treatment [100%N and P. but not inoculated]. All the treatments inoculated with the PGPR biofertilizer obtained 50% p only. Inoculation of sugar beet seeds with EM or PGPR inoculum alone with 75% N did not give significant effect on most studied parameters. But solitary inoculation with EM or PGPR with 50% N, mostly, had negative effects on the studied characters. The mixed inoculation with EM and PGPR with 75% N and 50% p attained the highest top yield [ton/fed], root yield [ton/fed], root fresh weight [kg/plant], sugar yield [ton/fed], sucrose%, N content and K%, while, P-content, alpha-amino nitrogen, sugar loss to molasses, extractable sugar, extractability and purity percentages were not significantly affected. The treatment of mixed inoculation with 75% N and 50% P, also, attained the highest economic net return [L.E. /fed]. Thus, this treatment is recommended for its beneficial effect on yield, quality and save of mineral fertilizer. According environmental viewpoint, this treatment may saves consumed energy, the matter which leads to decrease of CO[2] emission resulting a positive impact on the environment