Objective. Study the effect of chickpea seed inoculation with a suspension of Mesorhizobiumciceri ND-64 on crop yields, calculate the economic and bioenergy efficiency of seed bacterization.Methods. Microbiological, field experiment, economic, statistical. Results. It was shown that presowing inoculation of chickpea seeds with M. ciceri ND-64 during cultivation of this culture inPolissia of Ukraine conditions contributed to the increased efficiency of legume-rhizobial symbiosis. During three years of research there was an increase in structural parameters: the numberof beans per plant — by 15–42 %, seeds from the plant — by 12–32 %, weight of seeds from theplant — by 12–37 %, weight of 1000 seeds — by 6–9 % relative to positive (with inoculation usingreference strain of M. ciceri H-12) and absolute (without inoculation) controls, respectively. Theyield of Pamiat variety chickpeas increased by 12.8–26.5 %. The amount of profit when bacterialsuspension of M. ciceri ND-64 was applied for seed bacterization per 1 ha of sown area was UAH10,795 and the level of profitability was 106.1 %. The payback of each hryvnia of additional costswith additional income was UAH 19.43 after inoculation with M. ciceri H-12 and UAH 30.88 after M. ciceri ND-64. With anthropogenic energy consumption of 10,479 MJ in the variant with bacterization using M. ciceri ND-64 per 1 ha of sown area, the energy content of the obtained grain was26,181 MJ, respectively, the energy efficiency coefficient was 2.50. The additional energy costs associated with the use of M. ciceri ND-64 were 16.56 times paid back by the energy of the additionalcrop. Conclusion. The use of M. ciceri ND-64 for pre-sowing inoculation of chickpea seeds ofPamiat variety provided an increase in the number of seeds from the plant by 42 %, weight of seedsfrom the plant by 32 %, weight of 1000 seeds by 9 % and increase crop yields by 26.5 % relative tocontrol when the crop was cultivated in Polissia area during three years of research. All parameters of economic and energy efficiency of pre-sowing bacterization with M. ciceri ND-64 are moreeffective in comparison with inoculation using M. ciceri H-12.

The paper presents the results of studies of the economic and energy efficiency of the microbial preparations Rhizohumin and Hetomik use at growing of yellow lupine on the background of a viral infection. It was established that studied preparations were highly effective in both economic and energy aspects.

The paper describes the investigation results of economic and energy efficiency of microbial preparation Bactopaslon application in the technology of potato cultivation. The high efficiency of the studied biological product due to the advanced yield increase rates as compared to the increased costs was established.

The survey results of the economic and energy efficiency of the microbial preparation Diazobacterin use along with fertilizers in cultivation technology of winter rye are presented. It was established that combined application of Diazobacterin and fertilization in a dose N60K40 in winter rye cultivation on sod-podzolic soils to be the most cost and energy efficient.

The results of efficiency studies by major economic and energetic parameters of pretreatment of soybean with inoculants based on rhizobia Bradyrhizobium japonicum and associative diazotrophs Azospirillum brasilense are provided. It was established that the highest levels of the studied parameters are achieved using mixed cultures of nitrogen fixing microorganisms. The high economic and energetic efficiency was also observed during inoculation of soybean with rhizobia pure culture. However, no significant positive impact of A. brasilense applied separately was found in terms of studied parameters.