Tham khảo tài liệu 'environmental technologies part 3', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Ecological Economic and Marketing Aspects of the Application of Biofertilisers in the Production of Organic Food 33 Fertilisers Total number of microorganisms Number of Azotobacter-a Dehydrogenase activity Index level Index level 1 soil Index level 0 438 100 80 481 120 460 160 463 Average 468 Table 2. Effects of bacterisation and fertilisers on parameters of soil biogeny in rhizospheres of maize hybrids of FAO 600-700 The analysis of gained results indicates certain regularity in the increase of their number at low rates of mineral nitrogen. The highest number and the percentage of the increase were determined at fertiliser rates of 80-120 . Beside the total number of microorganisms and Azotobacter a dehydrogenase activity is also an important parameter of soil biogeny. The greater value of dehydrogenase points out to faster proceeding of oxidoreduction processes in the soil that is to faster and greater mineralisation of fresh organic matter. The highest values of dehydrogenase and the percentage of increase were determined in the variant with bacterisation and a fertiliser rate of 80 which correlate to previous two parameters. Based on the statistical analysis of results gained over years it can be concluded that the total number of microorganisms was significantly increased in the variant with bacterisation and fertilising as well as in the interaction of these two factors. Fertilisers Total number of microorganisms Number of Azotobacter Dehydrogenase activity Index level Index level pgTPFg-1 soil Index level 0 407 100 60 526 90 438 120 440 150 113
