Tag Archives: biofertilizers

330–349 A.H. Tsaturyan, G.M. Khachatryan, A.V. Goginyan, Y.H. Zakharyan, Y.V. Chesnokov and V.B. Goginyan
Influence of different classes of agrochemicals on the growth and viability of microorganisms in biofertilizers
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Influence of different classes of agrochemicals on the growth and viability of microorganisms in biofertilizers

A.H. Tsaturyan¹, G.M. Khachatryan¹, A.V. Goginyan², Y.H. Zakharyan³, Y.V. Chesnokov³ and V.B. Goginyan¹*

¹Scientific and Production Center “Armbiotechnology” of the National Academy of Sciences (SPC “Armbiotechnology” NAS RA), 14 Gyurgyan street, AM0056 Yerevan, Armenia
²Yerevan State Medical University after Mkhitar Heratsi, 2 Koryun street, AM0025, Yerevan, Armenia
³Agrophysical Research Institute, 14, Grazhdanskiy pr., RU195220 Saint-Petersburg, Russia
*Correspondence: goginyan@gmai.com

Abstract:

The compatibility of biofertilizers with conventional agrochemicals is a critical but underexplored factor influencing integrated crop management. While biofertilizers offer sustainable alternatives to chemical inputs, their simultaneous application with pesticides and micronutrient formulations may compromise microbial viability and functionality. This study systematically evaluated the in vitro compatibility of commonly used agrochemicals with microbial strains constituting the biofertilizers N-Fixera (Azotobacter chroococcum MDC 6111) and PhosRhiza (Paenibacillus polymyxa MDC 280 and Priestia megaterium MDC 2124). Microbial responses were assessed using a disc diffusion assay on Petri dishes, with growth stimulation or inhibition scored on a five-point scale. Agrochemicals were classified as insecticides, herbicides, fungicides, or micronutrient formulations. Data were integrated via heatmaps and class-level averaging to reveal general compatibility patterns. Results demonstrated pronounced strain-specific and chemical class–dependent effects. Insecticides and fungicides exerted the strongest selective pressure, markedly inhibiting spore-forming Gram-positive bacteria, whereas A. chroococcum exhibited higher tolerance and occasional stimulation. Herbicides were largely neutral or weakly stimulatory across all strains, indicating minimal direct microbial toxicity. Micronutrient formulations showed a narrow safety margin, with complex mixtures strongly inhibiting nitrogen-fixing bacteria. These findings indicate that compatibility cannot be generalized at the product level and must be evaluated at the strain level. The proposed visualization-based framework offers a practical tool for optimizing the combined use of biological fertilizers and agrochemicals, enhancing the reliability, sustainability, and efficiency of integrated crop management strategies.

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1241-1253 O. Nikipelova, N.Pyliak, V. Yarochevsky, A. Rucins and V. Bulgakov
Study of the influence of different organic fertilizers on soil agrochemical parameters in hazelnut plantations in Ukrainian Southern Steppe
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Study of the influence of different organic fertilizers on soil agrochemical parameters in hazelnut plantations in Ukrainian Southern Steppe

O. Nikipelova¹, N.Pyliak¹, V. Yarochevsky¹, A. Rucins²* and V. Bulgakov³

¹Engineering and Technological Institute ‘Biotekhnika’ of the National Academy of Agrarian Sciences of Ukraine, 26 Mayatska doroha Str., Khlibodarske, UA67666 Odesa District, Ukraine
²Latvia University of Life Sciences and Technologies, Ulbroka Research Center, 1 Instituta Str., LV-2130 Ulbroka, Latvia
³National University of Life and Environmental Sciences of Ukraine, 15 Heroyiv Oborony Str., UA 03041 Kyiv, Ukraine
*Correspondence: adolfs.rucins@lbtu.lv

Abstract:

The effect of different origin organic fertilizers on agrochemical indicators of typical medium-humic chernozem in hazelnut plantings in the conditions of Ukrainian Southern Steppe was studied. There were used cattle manure, chicken droppings, Biofertilizer No. 1 (the combination of sewage sludge, winter wheat straw, phosphate-mobilizing bacteria Microbacterium barkeri), Biofertilizer No. 2 (the combination of sewage sludge, sunflower seed husks, phosphate-mobilizing bacteria Microbacterium barkeri), and native sewage sludge in the study. It was found that different origin organic fertilizers effected on the main agrochemical soil indicators increasing. The content of easy hydrolyzable nitrogen in soil increased from 84.0 mg kg-1 in control up to 98.0 mg kg-1 in the tests, mobile phosphorus – consequently from 138.75 mg kg-1 in control to 306.30 mg kg-1 in the tests, and potassium from 108.40 mg kg-1 in control to 166.90 mg kg-1. In addition, the organic matter content increasing from 3.76% (control) to 4.18% (tests) in the soil was detected. The express biosensor analysis of the fertilized soil showed a variation of the average ecotoxicity indicator from 0.92 to 1.41 which could be classified as a “low” common pollution level. It also detected an elevated zinc content in soil samples fertilized by Biofertilizer No. 1 and native sewage sludge. It proves that organic fertilizers based on sewage sludge applying can allow for overcoming the zinc deficit in Ukrainian soils. The advantages of Biofertilizers No. 1 and No. 2 were identified in respect to other studied organic fertilizers. New biofertilizers using allows soil nutrient content increasing, soil biological activity enhancement, which resulting in improvement in crop yield, and environmental enhancement.

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412-418 N. Mikhailouskaya and I. Bogdevitch
Effect of biofertilizers on yield and quality of long-fibred flax and cereal grains
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Effect of biofertilizers on yield and quality of long-fibred flax and cereal grains

N. Mikhailouskaya and I. Bogdevitch

Research Institute for Soil Science and Agrochemistry, Kazintsa 62, 220108 Minsk, Belarus;e-mail:brissa5@mail.belpak.by, bionf@yandex.ru

Abstract:

Application of biofertilizers provides the implementation of biological mechanisms of plant nutrition, growth promotion and protection. These are arguments for the use of biofertilizers as elements for nutrient management in organic agriculture, along with low cost and environmental safety. Azobacterin and Kaliplant were developed in Belarus. Natural N2-fixing bacteria are acting agents of Azobacterin. Kaliplant contains a natural strain of K-mobilizing bacteria. Both strains possess P-solubilization activity. The effects of biofertilizers on crop yield and quality were studied in field experiments on Luvisol soils. The contribution of biofertilizers for the crop yield increment varied in range from 8–30%. Azobacterin applications were most effective for barley and long-fibred flax. Kaliplant inoculations were mostly profitable for winter rye and winter triticale. Biofertilizers positively influenced crop production quality. Reliable increase of protein content and the improvement of amino acid composition in cereal grains were observed.

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