Blagoj Elenov

• Doctor of Engineering
• Professor (Assistant) at Agricultural Academy - Bulgaria

The surface roughness of the parts has a significant influence on their performance properties and it is crucial for the friction force and wear of the bodies. Therefore, in practice it is often necessary to perform finishing treatment to reduce the macro, micro and meso-roughnesses-grinding, honing, lapping, polishing and more. In this study are e...

This paper examines the topography and roughness of coatings of hard alloyed materials deposited by electrospark deposition (ESD) on titanium and nickel alloys with different initial roughness. The influence of the electrode materials and the energy parameters of the ESD process on the roughness parameters Ra, Rt, Rq, Rz, Rmax, on the depth of wavi...

The process of granulation of organomineral fertilizer, created on the basis of poultry manure, with a horizontal flat matrix, was investigated. The influence of the humidity of the organomineral fertilizer on the studied parameters of the granulation process was determined: the power consumption, output of the granulation machine, the specific ene...

According to most researchers, improving the tribological characteristics of titanium alloys at this stage is most appropriate through surface modification tribotechnologies. In the present work, the qualitative characteristics of coatings of tungsten-free hard alloy materials materials based on TiC, TiN TiCN TiB2, applied on the most popular titan...

A mathematical model has been developed that describes the process of purification of vegetable oils using physical methods. The obtained mathematical model determines the mode of operation of the main parameters of the machine for the purification of vegetable oils, depending on the dispersed composition of the impurities and the type of vegetable...

Emerging climate changes and rapidly growing demand for food are creating preconditions for making water an increasingly valuable resource and irrigation management assumed greater importance and increasingly responsible essential role on food quality and environment protection. The aim of this paper is to present the effects of the time of harvest...

Climate changes and competition between agriculture and other sectors for soil and water resources usage that water resource management and fertigation management obtains increasing significance. The aim of this paper is to present the effects of the applied regimes of fertilisation and irrigation on the physical characteristics of white strawberry...

The aim of this paper is to present the effects of the time of harvesting, irrigation and fertigation on the physicochemical and biochemical indicators of white strawberry fruits during the cold VWRUDJHɌ ၨ& The fruits were grown in 2024 as part of a two-factor experiment conducted in an experimental field at the Institute of Soil Science, Agrotechn...

The aim of this paper is to present the effects of the applied regimes of fertilization and irrigation on the physical characteristics of white strawberry fruits. A two factors experiment was conducted during 2024 in unheated greenhouse in the Chelopechene experimental field, Sofia, Bulgaria with drip irrigated and fertigated strawberry variety ()U...

This paper aims to present the effects of the applied regimes of fertilization and irrigation on the pomological characteristics of white strawberry fruits. A two-factor experiment was conducted during 2023 and 2024 in an unheated greenhouse in the Chelopechene experimental field, Sofia, Bulgaria with drip irrigated and fertigated strawberry cultiv...

The aim of this paper is to present the effects of the applied regimes of fertilization and irrigation on the sensory characteristics of white strawberry variety. A two factors experiment was conducted during 2023 in unheated greenhouse in the Chelopechene experimental field, Sofia, Bulgaria with drip irrigated and fertigated strawberry variety (Fr...

The purpose of this article is to present the effects of applied fertilization and irrigation regimes on the physicochemical and biochemical indicators of the white strawberry variety. A two factors experiment was conducted during 2023 in unheated greenhouse in the Chelopechene experimental field, Sofia, Bulgaria with drip irrigated and fertigated...

За да се осигури прехраната на населението на земята е необходимо със същият темп да нараства и производството на храни. На този етап биологическият потенциал на растителните видове е ограничен. Призивите за биологично производство с оглед опазване здравето на хората и околната среда, въпреки своите аргументи не могат да доведат до решаване на хран...

The protection of agricultural production from enemies must be carried out with maximum protection of the treated plantations and targeted utilization of the working fluid. Therefore, it is necessary that the distribution of Растениевъдни науки, 2023, 60(5) Bulgarian Journal of Crop Science, 2023, 60(5) https://doi.org/10.61308/AYNE4256 89 the work...

Climate changes and competition between agriculture and oth­er sectors for soil and water resources usage that water resource manage­ment obtains increasing significance. As a part of agricultural water re­source management the choice of irrigation scheduling method influences the yield, water and fertilizer use efficiency, energy consumption, cost...

Emerging climate changes and rapidly growing demand for food are creating preconditions for making water an increasingly valuable resource and irrigation management assumed greater importance and increasingly responsible essential role. This study uses CROPWAT 8.0 model by FAO to predict and simulate crop water requirements for greenhouse tomato pr...

The object of the present work are the surface properties of technical titanium produced by 3D printing-Direct Metal Laser Sintering (DMLS) with subsequent treatment by local electrospark deposition with a rotating electrode (LESD). The layering was performed with electrodes of multicomponent hard alloys based on WC with additives from B4C, TiB2 an...

In this work the possibilities of reducing the roughness and defects of surfaces obtained by 3D printing with selective laser melting (SLM), via reactive electrospark surface modification (ESD) with low-melting AlSi alloys has been shown. The influence of the energy parameters of the ESD process on the roughness, microstructure, microhardness and p...

An experimental setup with ultrasonic generator for purification of sunflower oil under the influence of ultrasonic field has been developed. The options for using the ultrasonic field for primary cleaning of sunflower oil are considered. Experimental studies of the effect of ultrasonic cavitation by changing the frequency and power of the electric...

An analysis of the pathogenic microflora of sunflower was performed and was determined by its composition. The degree of spread and development of pathogens on selection samples was determined. Dominant species have been identified. The factors contributing to the development and spread of diseases were analyzed.

This work provides an overview of the technological features of additive technologies for manufacturing metal parts and products (3D printing metals). The nature and types of printing, perspectives, and opportunities for their development are indicated. The advantages and disadvantages of additive technologies are clarified. An analysis of the tech...

The quality of agricultural production is most significantly influenced by the application of chemicals. In accordance with modern quality requirements, it is necessary not to exceed the standards that cause pollution and at the same time to protect plants from diseases and pests. It is necessary to find the most suitable machine and configuration,...

The quality of agricultural production is most significantly influenced by the use of chemicals.In accordance with current quality requirements, it is necessary not to exceed the standards that cause pollution and at the same time protect plants from diseases and pests. This necessitates the search for new solutions.One of them could be the drone....

Elements of mechanized plant protection operations are analyzed. Recommendations are given for proper conducting in order to save products and reduce environmental pollution and production. Recommendations are given for choosing an appropriate plant protection machine according to the requirements of the farmers. KEY WORDS: MECHANIZATION, PLANT PRO...