Георги Костадинов | Institute of Soil Science, Agrotechnologies and Plant Protecion (original) (raw)
Papers by Георги Костадинов
Bulgarian Journal of Soil Science, Agro-chemistry and Ecology, Mar 14, 2018
Bulgarian Journal of Soil Science, Agro-chemistry and Ecology, Jul 25, 2017
Journal of Mountain Agriculture on the Balkans, 2018
В данной статье изучены факторы возникновения техногенной деградации почвы в результате её обрабо... more В данной статье изучены факторы возникновения техногенной деградации почвы в результате её обработки почвообрабатывающими орудиями разных типов и представлены результаты проведенных исследований. Разработаны рекомендаци по снижению их влияния на обрабатываемые почвенные горизонты и предложен инновационный рабочий орган, уменьшающийотрицательное воздействие на почву Ключевые слова: чизель, рабочий орган, обработка почвы, воспроизводство плодородия, техногенная деградация
Bulgarian Journal of Agricultural Science, Dec 14, 2020
The main objective of this study is to analyze the mutual influence of different irrigation regim... more The main objective of this study is to analyze the mutual influence of different irrigation regimes and fertilization rates on the greenhouse tomato yield and on the irrigation water use efficiency. Different irrigation schedulings have been studied in order to establich the impact of water deficit on the tomato productivity and quality. The study is achieved through an experiment with tomatoes in polyethylene unheated greenhouse during 2016-2018. An important role in the technology plays fertilization with different rates. The focus in this experiment is on the effect of a controlled water deficit achieved by reducing the irrigation depth at different levels of plant nutrition on the productivity of greenhouse tomatoes and water use efficiency. In studies interval of irrigation depth and fertilizer rate was found significantly stronger influence of the fertilizer rate on yield. The impact of irrigation on the yield is lower at the lower fertilizer levels. It has greater effect at the higher levels of the irrigation rate. Close to the maximum yield-over 100 Mg/ha can be obtained also by applying the maximum fertilization rate and 80% of the full irrigation depth. The greatest relative additional yield (RAdYn) can be obtained by maximum irrigation depth and maximum fertilizer rate and irrigation has greater effect at maximum and close to it fertilization rates. Maximum water use efficiency can be obtained by a minimum amount of irrigation water and maximum fertilization. Moreover, irrigation has small impact at lower fertilization rates (up to 50%), i.e. WUE is small. The analysis of the the utility function, which summarizes the conditions for obtaining maximum yield and maximum water use efficiency indicates that it maximum value can be obtained at maximum fertilizer rate and 60-70% of the full irrigation depth.
Bulgarian Journal of Soil Science, Agro-chemistry and Ecology, Mar 7, 2017
Обработката на почвата, взета като система в рамките на едно сеитбообращение, изисква оптимизиран... more Обработката на почвата, взета като система в рамките на едно сеитбообращение, изисква оптимизиране на броя и дълбочината на почвообработващите операции. Съвременните системи за обработка на почвата се основават на значително развитие на техниката и широко приложение на химията, и се разработват в съответствие с разнообразните почвено-климатични условия. Затова се налага тяхното конкретизиране и реализиране в съответствие с агроекологичните и
Journal of Mountain Agriculture on the Balkans, 2019
Journal of Mountain Agriculture on the Balkans, 2016
Journal of Mountain Agriculture on the Balkans, 2018
The field experiment was conducted at the Instructional Farm of Faculty of Agricultural Engineeri... more The field experiment was conducted at the Instructional Farm of Faculty of Agricultural Engineering, BCKV, Nadia, West Bengal during the year of 2016-17. The study was conducted with the objectives to determine the water requirements of summer rice under drip irrigation, to compare the water requirements of summer rice under drip and conventional (flooding) irrigation and yield of summer rice cultivation under drip irrigation. In the study, there were four irrigation treatments with four replications. The different irrigation treatments were (i) T1- Conventional irrigation with 5 cm of water in each irrigation after disappearance of water, (ii) T2-0.8 Epan under drip irrigation @ 4 l/h at 3 days interval, (iii) T3-1.0 Epan under drip irrigation @ 4 l/h at 3 days interval and (iv) T4-1.2 Epan under drip irrigation @ 4 l/h at 3 days interval. The amount of irrigation water required under drip irrigation at 0.8 Epan treatments had been found to be the lowest i.e., 258 mm and the highest value was 365 mm at 1.2 Epan treatments and in conventional irrigation system it was found 600 mm. The water requirements under drip irrigation for all the treatments were less as compared to conventional (flooding) irrigation. The average yield at T1, T2, T3 and T4 treatments were 2.29 t/ha, 3.10 t/ha, 2.44 t/ha and 2.54 t/ha respectively. It was also observed that the water use efficiency was found to be the highest at the treatment of 0.8 Epan of drip irrigation was 8.126 t/ ha-cm. This indicated that the average yield and WUE were found more under the drip system in compare to conventional system.
The objective of this work was to assess the extent of effect of the factors related to productio... more The objective of this work was to assess the extent of effect of the factors related to production costs in wine grape production. An approach and methods for technological and technical analysis of grape production have been developed. The analysis showed that the costs related to plant protection had the greatest share in the total costs (40%), followed by the costs related to grape harvesting (17%), fertilizing (14.5%) and selective pruning (11%). The fertilizer costs were 1/6 of the total costs and those of preparations-1/3. It was found that the analyzed factors definitely influenced the costs of grape production in plantations up to 30-40 ha. Their effect decreased considerably in larger areas. For the different factors that effect differed from parts of one percent to 20%. Within the range of the possible price of the used power means, its effect on the variable costs reached the greatest value among the analyzed factors-up to 20%. The effect of its annual load was also considerable. The functional relations obtained in this study and analyses allow using them to elaborate programm modules for functional multi-criterion analysis of agricultural production.
Mortev, I., Prisadashki, Ts., Kostadinov, G., Monev, N. & Dimitrova, E. (2018). Manufacturing of ... more Mortev, I., Prisadashki, Ts., Kostadinov, G., Monev, N. & Dimitrova, E. (2018). Manufacturing of plant protective machines in Perla Nova Zagora. Rastenievadni nauki, 55(2), 3-15 (Bg). A thorough analysis of the development of plant protection equipment in the Perla plant, Nova Zagora, Bulgaria in the past 60 years was carried out. In the 1960s, with huge efforts and despite the low level of machine building, high-level sprinklers were produced at the Perla plant on high level for the socialist camp, and on average level for the Western European countries. Some technical solutions, unfamiliar to Western producers, have realized in the production of these machines. Insufficient research in this direction did not allow machines to be widely applied in practice despite of their advantages. Experience has shown that the introduction of new technologies unknown to our country can not only be achieved through the manufacture or import of suitable machines. This can only be a necessary requ...
Journal of The Balkan Tribological Association, 2020
In the present work the properties, advantages and disadvantages of titanium and its alloys and t... more In the present work the properties, advantages and disadvantages of titanium and its alloys and their suitability for use in various fields of application are discussed. The essence and technological features of the methods for improve the tribological characteristics of titanium and its alloys are considered. Based on a comparative analysis of their technical parameters and technological capabilities, appropriate methods and processes for applied of wear-resistant coatings and surface modification in order to improving the abrasion resistance and performance of titanium and titanium alloys are shown. The reasons for choosing the electrical spark deposition as an effective and suitable method for improving the surface properties of titanium alloys are determined. Guidelines for selecting an effective and suitable method for improving the surface properties of titanium and its alloys in different operational applications are indicated.
Materials, methods & technologies, Sep 12, 2020
The surface roughness of the parts has a significant influence on their performance properties an... more 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 examined the possibilities of reducing the roughness and the traces of the previous machining of steel surfaces by electro-spark deposition (ESD) with lowmelting aluminium alloys. The roughness of the steel surfaces obtained after different milling modes after subsequent electrospark coating was investigated. Dense and uniform coatings with different surface microgeometry are obtained, which to a different extent erase the traces of the preceding processing. The examination of tribological characteristics showed a significant increase in the wear resistance of the coated surfaces. The process parameters and materials for ESD at which coated surfaces have simultaneously the lowest roughness and the highest wear resistance have been determined and optimized.
INMATEH-Agricultural Engineering, 2012
The article continues to present some results related to those in [3], thoroughly studying the re... more The article continues to present some results related to those in [3], thoroughly studying the results of aggregates working optimization operating mode designed to soil works, their significance and interpretation.
Bu araştırma çalışmasında, seralar için Bluetooth tabanlı kablosuz ölçüm sistemi tasarlanmıştır. ... more Bu araştırma çalışmasında, seralar için Bluetooth tabanlı kablosuz ölçüm sistemi tasarlanmıştır. Sistemin prototip uygulaması sera içinde kurulan deneylerle test edilmiştir. Sistem yönetici bilgisayar, CB-RSPA333 seri port adaptörü ve 2 kablosuz iletişim biriminden oluşmuştur. Her kablosuz iletişim biriminde PIC16F876 mikrodenetleyicisi, CB-SPA331 Bluetooth modülü ve birer adet SHT11 ve DS18B20 sensörleri bulunmaktadır. Sistem sera dışındaki yönetici bilgisayardan gönderilen komutlara göre, sera içindeki kablosuz birimlerin kontrolü, bilgisayara verilerin aktarılması ve kaydedilmesi, gerçek zamanlı monitörleme işlemlerini yapacak şekilde programlanmıştır. Test çalışmalarında bitkinin tepe ve alt seviyelerindeki hava, toprak sıcaklıkları ve bağıl nem verileri ölçülmüştür. Tipik bir yaz gününde kablosuz olarak kaydedilen verilere göre, bitkinin tepe ve alt taraflarındaki hava sıcaklıkları sırasıyla 12.1°C-36.2°C ile 13.9°C-31.7°C aralıklarında değişmiştir. Bağıl nem değişimleri sırasıyla % 19.9-67.3 ile %25.9-%72.1 aralığında ölçülmüştür.
Bulgarian Journal of Soil Science, Agro-chemistry and Ecology, Mar 14, 2018
Bulgarian Journal of Soil Science, Agro-chemistry and Ecology, Jul 25, 2017
Journal of Mountain Agriculture on the Balkans, 2018
В данной статье изучены факторы возникновения техногенной деградации почвы в результате её обрабо... more В данной статье изучены факторы возникновения техногенной деградации почвы в результате её обработки почвообрабатывающими орудиями разных типов и представлены результаты проведенных исследований. Разработаны рекомендаци по снижению их влияния на обрабатываемые почвенные горизонты и предложен инновационный рабочий орган, уменьшающийотрицательное воздействие на почву Ключевые слова: чизель, рабочий орган, обработка почвы, воспроизводство плодородия, техногенная деградация
Bulgarian Journal of Agricultural Science, Dec 14, 2020
The main objective of this study is to analyze the mutual influence of different irrigation regim... more The main objective of this study is to analyze the mutual influence of different irrigation regimes and fertilization rates on the greenhouse tomato yield and on the irrigation water use efficiency. Different irrigation schedulings have been studied in order to establich the impact of water deficit on the tomato productivity and quality. The study is achieved through an experiment with tomatoes in polyethylene unheated greenhouse during 2016-2018. An important role in the technology plays fertilization with different rates. The focus in this experiment is on the effect of a controlled water deficit achieved by reducing the irrigation depth at different levels of plant nutrition on the productivity of greenhouse tomatoes and water use efficiency. In studies interval of irrigation depth and fertilizer rate was found significantly stronger influence of the fertilizer rate on yield. The impact of irrigation on the yield is lower at the lower fertilizer levels. It has greater effect at the higher levels of the irrigation rate. Close to the maximum yield-over 100 Mg/ha can be obtained also by applying the maximum fertilization rate and 80% of the full irrigation depth. The greatest relative additional yield (RAdYn) can be obtained by maximum irrigation depth and maximum fertilizer rate and irrigation has greater effect at maximum and close to it fertilization rates. Maximum water use efficiency can be obtained by a minimum amount of irrigation water and maximum fertilization. Moreover, irrigation has small impact at lower fertilization rates (up to 50%), i.e. WUE is small. The analysis of the the utility function, which summarizes the conditions for obtaining maximum yield and maximum water use efficiency indicates that it maximum value can be obtained at maximum fertilizer rate and 60-70% of the full irrigation depth.
Bulgarian Journal of Soil Science, Agro-chemistry and Ecology, Mar 7, 2017
Обработката на почвата, взета като система в рамките на едно сеитбообращение, изисква оптимизиран... more Обработката на почвата, взета като система в рамките на едно сеитбообращение, изисква оптимизиране на броя и дълбочината на почвообработващите операции. Съвременните системи за обработка на почвата се основават на значително развитие на техниката и широко приложение на химията, и се разработват в съответствие с разнообразните почвено-климатични условия. Затова се налага тяхното конкретизиране и реализиране в съответствие с агроекологичните и
Journal of Mountain Agriculture on the Balkans, 2019
Journal of Mountain Agriculture on the Balkans, 2016
Journal of Mountain Agriculture on the Balkans, 2018
The field experiment was conducted at the Instructional Farm of Faculty of Agricultural Engineeri... more The field experiment was conducted at the Instructional Farm of Faculty of Agricultural Engineering, BCKV, Nadia, West Bengal during the year of 2016-17. The study was conducted with the objectives to determine the water requirements of summer rice under drip irrigation, to compare the water requirements of summer rice under drip and conventional (flooding) irrigation and yield of summer rice cultivation under drip irrigation. In the study, there were four irrigation treatments with four replications. The different irrigation treatments were (i) T1- Conventional irrigation with 5 cm of water in each irrigation after disappearance of water, (ii) T2-0.8 Epan under drip irrigation @ 4 l/h at 3 days interval, (iii) T3-1.0 Epan under drip irrigation @ 4 l/h at 3 days interval and (iv) T4-1.2 Epan under drip irrigation @ 4 l/h at 3 days interval. The amount of irrigation water required under drip irrigation at 0.8 Epan treatments had been found to be the lowest i.e., 258 mm and the highest value was 365 mm at 1.2 Epan treatments and in conventional irrigation system it was found 600 mm. The water requirements under drip irrigation for all the treatments were less as compared to conventional (flooding) irrigation. The average yield at T1, T2, T3 and T4 treatments were 2.29 t/ha, 3.10 t/ha, 2.44 t/ha and 2.54 t/ha respectively. It was also observed that the water use efficiency was found to be the highest at the treatment of 0.8 Epan of drip irrigation was 8.126 t/ ha-cm. This indicated that the average yield and WUE were found more under the drip system in compare to conventional system.
The objective of this work was to assess the extent of effect of the factors related to productio... more The objective of this work was to assess the extent of effect of the factors related to production costs in wine grape production. An approach and methods for technological and technical analysis of grape production have been developed. The analysis showed that the costs related to plant protection had the greatest share in the total costs (40%), followed by the costs related to grape harvesting (17%), fertilizing (14.5%) and selective pruning (11%). The fertilizer costs were 1/6 of the total costs and those of preparations-1/3. It was found that the analyzed factors definitely influenced the costs of grape production in plantations up to 30-40 ha. Their effect decreased considerably in larger areas. For the different factors that effect differed from parts of one percent to 20%. Within the range of the possible price of the used power means, its effect on the variable costs reached the greatest value among the analyzed factors-up to 20%. The effect of its annual load was also considerable. The functional relations obtained in this study and analyses allow using them to elaborate programm modules for functional multi-criterion analysis of agricultural production.
Mortev, I., Prisadashki, Ts., Kostadinov, G., Monev, N. & Dimitrova, E. (2018). Manufacturing of ... more Mortev, I., Prisadashki, Ts., Kostadinov, G., Monev, N. & Dimitrova, E. (2018). Manufacturing of plant protective machines in Perla Nova Zagora. Rastenievadni nauki, 55(2), 3-15 (Bg). A thorough analysis of the development of plant protection equipment in the Perla plant, Nova Zagora, Bulgaria in the past 60 years was carried out. In the 1960s, with huge efforts and despite the low level of machine building, high-level sprinklers were produced at the Perla plant on high level for the socialist camp, and on average level for the Western European countries. Some technical solutions, unfamiliar to Western producers, have realized in the production of these machines. Insufficient research in this direction did not allow machines to be widely applied in practice despite of their advantages. Experience has shown that the introduction of new technologies unknown to our country can not only be achieved through the manufacture or import of suitable machines. This can only be a necessary requ...
Journal of The Balkan Tribological Association, 2020
In the present work the properties, advantages and disadvantages of titanium and its alloys and t... more In the present work the properties, advantages and disadvantages of titanium and its alloys and their suitability for use in various fields of application are discussed. The essence and technological features of the methods for improve the tribological characteristics of titanium and its alloys are considered. Based on a comparative analysis of their technical parameters and technological capabilities, appropriate methods and processes for applied of wear-resistant coatings and surface modification in order to improving the abrasion resistance and performance of titanium and titanium alloys are shown. The reasons for choosing the electrical spark deposition as an effective and suitable method for improving the surface properties of titanium alloys are determined. Guidelines for selecting an effective and suitable method for improving the surface properties of titanium and its alloys in different operational applications are indicated.
Materials, methods & technologies, Sep 12, 2020
The surface roughness of the parts has a significant influence on their performance properties an... more 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 examined the possibilities of reducing the roughness and the traces of the previous machining of steel surfaces by electro-spark deposition (ESD) with lowmelting aluminium alloys. The roughness of the steel surfaces obtained after different milling modes after subsequent electrospark coating was investigated. Dense and uniform coatings with different surface microgeometry are obtained, which to a different extent erase the traces of the preceding processing. The examination of tribological characteristics showed a significant increase in the wear resistance of the coated surfaces. The process parameters and materials for ESD at which coated surfaces have simultaneously the lowest roughness and the highest wear resistance have been determined and optimized.
INMATEH-Agricultural Engineering, 2012
The article continues to present some results related to those in [3], thoroughly studying the re... more The article continues to present some results related to those in [3], thoroughly studying the results of aggregates working optimization operating mode designed to soil works, their significance and interpretation.
Bu araştırma çalışmasında, seralar için Bluetooth tabanlı kablosuz ölçüm sistemi tasarlanmıştır. ... more Bu araştırma çalışmasında, seralar için Bluetooth tabanlı kablosuz ölçüm sistemi tasarlanmıştır. Sistemin prototip uygulaması sera içinde kurulan deneylerle test edilmiştir. Sistem yönetici bilgisayar, CB-RSPA333 seri port adaptörü ve 2 kablosuz iletişim biriminden oluşmuştur. Her kablosuz iletişim biriminde PIC16F876 mikrodenetleyicisi, CB-SPA331 Bluetooth modülü ve birer adet SHT11 ve DS18B20 sensörleri bulunmaktadır. Sistem sera dışındaki yönetici bilgisayardan gönderilen komutlara göre, sera içindeki kablosuz birimlerin kontrolü, bilgisayara verilerin aktarılması ve kaydedilmesi, gerçek zamanlı monitörleme işlemlerini yapacak şekilde programlanmıştır. Test çalışmalarında bitkinin tepe ve alt seviyelerindeki hava, toprak sıcaklıkları ve bağıl nem verileri ölçülmüştür. Tipik bir yaz gününde kablosuz olarak kaydedilen verilere göre, bitkinin tepe ve alt taraflarındaki hava sıcaklıkları sırasıyla 12.1°C-36.2°C ile 13.9°C-31.7°C aralıklarında değişmiştir. Bağıl nem değişimleri sırasıyla % 19.9-67.3 ile %25.9-%72.1 aralığında ölçülmüştür.