Zdravka Petkova

• Assoc. prof.
• Professor (Associate) at Agricultural Academy - Bulgaria

In 2022-2023 a field experiment with wheat on Leached Smolnitsa was carried out in the experimental base of ISSAPP “N. Poushkarov”, town of Bozhurishte, Sofia region with the purpose of testing the effectiveness of 7 types of liquid organic and mineral fertilizers, which are basically compost extracts (plant biomass) with the addition of various or...

In a field experiment with corn on Leached Smolnitsa in an experimental base of ISSAPP “N. Pushkarov”, Bozhurishte, Sofia region, brought out for the purpose of testing the action of 3 types of liquid complex fertilizers, their positive influence on the development of corn has been established. Fertilizers are obtained by extracting compost from pl...

During the period 2020-2023 field experiments have been carried out -of soil type Leached Smolnitsa (Haplic Vertisol) in the experimental station of ISSAP “N. Poushkarov”, the town of Bozhurishte, Sofia region. The aim of this study is to identify the impact of two rates of nitrogen-phosphorus mineral fertilization, nonfertilizer variant and two so...

The aim of the study in a pot experiment on Alluvial-meadow soil (Fluvisol, FAO) was to evaluate the effect of different rates and combinations of nitrogen, phosphorus, potassium and silicon fertilizers on the growth of maize (Zea mays L.) an early hybrid Р-8834 from group 310 FAO “Syngenta”. The experiment included 16 variants of fertilization in...

Vegetation experiment was carried out to determine the efficiency of liquid organic fertilizers application in the initial phases of wheat development. Three types of liquid organic fertilizer with single and double application (in 14 days) were tested -”Extra force”, “Zinovii Corn” and “Zinovii Oil”. All studied fertilizers application have a posi...

The main aim of the study was to systematize and summarize archival data on yields from main field crops from multiple fertilizer experiments of Nikola Poushkarov ISSAPP on various soil types in Bulgaria. A large set of results from the field fertilizer experiments carried out on four different soil types: Calcareous Chernozem (Trastenik village),...

Abstract Crop rotation is the main factor in reducing losses caused by weeds, diseases, and pests and increasing yields, which has been used little in recent years in intensive agriculture. The study aimed to estimate the influence of two rates of nitrogen-phosphorus mineral fertilization on the yield of maize grown in a four-year cycle crop rotati...

The article presents a new view of the element silicon (Si) as important for plant and human health. It is the second most abundant element in the earth after oxygen. Until now, it has been considered a "non-useful plant nutrient", but its absence in the soil leads to the death of plants. Based on field fertilizer experiments with nitrogen, phospho...

ABSTRACT The study was conducted under pot experimental conditions with Alluvial-meadow soil. The aim of the trial was to evaluate the effect of different nitrogen, phosphorus, potassium, and silicon fertilizer rates in the soil and their impact on the uptake of basic macronutrients with sunflower (Helianthus annuus L.) biomass. The experiment incl...

Abstract The aim of presented experiments was to monitor the changes in some main agrochemical soil parameters as a result of factors from the crops agrotechnical complex. The influence of two increas- ing fertilizer norms and a non-fertilization control variant and two tillage systems (conventional and minimum) during the three-field crop rotation...

The study presents results of field experiments with maize conducted during the year 2020 on two fields with different soils in Bulgaria, namely Leached smolnitsa and Alluvial-meadow soil. This article aims to perform a simulation experiment of crop yields to evaluate the limits of maize grain yield grown on soils with different properties and with...

Petkova, Z., Nenova, L., Simeonova, Ts., Benkova, M., Nenov, M., Gerassimova, I., Katsarova, A., Atanassova, I. & Harizanova, M. (2021). Effect of different fertilizer rates on some quantitative parameters of maize in a pot experiment with alluvial-meadow soil. Bulg. J. Agri. Sci., 27 (5), 948-953 The aim of the present study was to evaluate the ef...

Petkova, Z. & Nedyalkova, K. (2020). Multiannual growing of remontant strawberries (opportunities for biological production). Bulg. J. Agric. Sci., 26 (3), 513-519 The study purpose was to determine the influence and to evaluate the addition of different fertilizer sources on the growth and yield of strawberries in the conditions of vegetation expe...

A pot experiment was carried out in 2016-2017 with the medicinal plant Calendula officinalis L. on different soil types-Leached Vertisol from the region of Bozhurishte and Fluvisol from the region of Tsalapitsa. This study investigated the effects of soil improvers in comparison to the traditionally used manure. The combination of soil and foliar f...

Copper adsorption and bioavailability to whole wheat plants in a slightly alkaline Alluvial-meadow soil (pH 7.4) contaminated with Cu (250-1500 mgkg-1) and inoculated or uninoculated with Fusarium Culmorum was studied in a laboratory (Cu adsorption experiment) and greenhouse (pollution and inoculation) experiments. Availability was assessed by usin...

Настоящата книга „Черноземите в България – проблеми, оценка, използване и опазване. Научни трудове” се издава по случай 130 години от написването на капиталния труд в естест- воизпитателните науки „Русский чернозем” от В. В. Докучаев през 1883 г., с което се поставят основите на науката за почвите в света, 140 години от рождението на основоположник...

Aim: The establishment of effectiveness of different sources of fertilization and to find the alternative methods of strawberry growth using composts and farmyard manure. Material and Methods: It is conducted pot experiment with test culture – remontant variety of strawberry on Leached Vertisols. Soil is representative for the wide spread strong cl...

As a result of decrease of stock-breeding and signifi cant limited quantity of organic fertilizers there is a need to use new organic sources. Multiple effects of organic fertilizers on soil fertility can not be replaced from mineral fertilizers. For maintenance the balance of organic matter and preserve the quality of soil it is continued the sear...

Research of the chemical, agrochemical properties and characteristics of the so-called weak developed soils on soft rocks (Regosols) was made to clarify their agrochemical conditions. Some key features of these soils have been studied. There is a big diversity in the content of basic nutrient elements – it varies between low and nearly medium conte...

Garden bean plants (Phaseolus vulgaris (L.) Savi.) cv. Xera were grown under glasshouse conditions at optimal fertilizer rates using mineral, organic, and foliar fertilizers previously established in a model pot experiment. It was shown the favorable effect of the foliar feeding on the biomass accumulation in the different vegetative organs and for...

A pot experiment with ryegrass has been conducted to compare some plant residues and organic fertilizers on two soil types– Calcareous Chernozem and Leached Vertisol. On the based of received data it is established that the effect of examined organic materials is higher under the conditions of Calcareous Chernozem than in Leached Vertisol. The barl...