M.K. Zinchenko, L.G. Stoyanova
Vladimir Research Institute of Agriculture, ul. Tsentralnaya, 3, pos. Novy, Suzdalsky r-n, Vladimirskaya obl., 601261, Russian Federation
Summary. The influence of six variants of application of mineral and organic-mineral fertilizers on the population of main physiological groups of microorganisms was studied under conditions of Vladimir Opolie on gray forest middle loamy soil. Agricultural backgrounds were tested at moldboard plowing at the depth of 20-22 cm. The structure of microbial cenosis including microorganisms developing on meat-and-peptone and starch-and-ammonia agar (MPA and SAA), oligonitrophilic, cellulose-decomposing, micromycetes, azotobacter was analyzed. The lowest general biogenic activity of gray forest soil was registered against high intensity mineral background (7.5-7.9 m CFU/g of soil). The proteolytic bacteria (MPA), azotobacter and cellulose-decomposing microorganisms were responsive to application of organic fertilizers (60 and 80 t/ha). Azotobacter content in soil in these variants increased by 48 and 72%, correspondingly, in comparison with null background. The population of cellulose-decomposing microorganisms grew more than 2.5 times. The predictable decrease in the population not only of oligonitrophilic group, but also of bacteria involved in nitrogen transformation (MPA and SAA) was observed against intensive and highly intensive backgrounds. The total number of bacteria developed on meat-and-peptone and starch-and-ammonia agar in fallow land was 2.6 times lower than the average amount for the test. The maximal development these microorganisms had in the soil in highly intensive organic and mineral background. Application of manure at the dose of 80 t/ha caused increase in its population to 10.7-13.2 m. Application of both mineral and organic fertilizers stimulated the development of bacterial complex of gray forest soil thus increasing its total biogenic activity 1.5-2 times in comparison with variants with prolonged and intensive use of mineral fertilizers.
Keywords: intensive background, microbial cenosis, gray forest soil, fertilizer system, physiological groups of microorganisms, soil biogenic activity, amino heterotrophic organisms, amino autotrophic organism, azotobacter.
Author Details: M.K. Zinchenko, Cand. Sc. (Biol.), head of laboratory (e-mail: Этот адрес электронной почты защищён от спам-ботов. У вас должен быть включен JavaScript для просмотра.); L.G. Stoyanova, senior research fellow.
For citation: Zinchenko M. K., Stoyanova L.G. Response of Microflora of Gray Forest Soil to Prolonged Use of Fertilizer Systems with Different Intensity Level. Dostizheniyanauki i tekhniki APK. 2016. V.30. No 2. Pp. 21-23 (In Russ.).