Irena Ivanova

Agricultural University Plovdiv · Department of Mathematics and Physics

Thirty – five samples of red wines from different geographic regions have been characterised according to 14 basic optical and chemical characteristics - colour parameters, content of anthocyanins and antioxidant activity. The goals of this study is to compare the tested wines using different statistical methods. Conducting hierarchical cluster ana...

68 different types of Bulgarian wines were studied in accordance with 9 optical parameters as follows: color parameters in XYZ and SIE Lab color systems, lightness, Hue angle, chroma, fluorescence intensity and emission wavelength. The main objective of this research is using hierarchical cluster analysis to evaluate the similarity and the distance...

Fourteen samples from acacia (Robinia pseudoacacia), lime(Tilia sp.), sunflower (Helianthus annuus), thistle (Onopordum acanthium), forest and honeydew honeys have been characterized according to their parameters of mineral and sugar content, color characteristics and refractive index. The samples have been grouped in two clusters–monofloral lime h...

A total 17 samples of white and red wines have been investigated and characterized with regard to the following optical properties – color coordinates, lightness, Hue angle, chroma and transmission coefficient in visible area. Based on the examined parameters the wines are evaluated in their complexity by hierarchical cluster analysis. The samples...

Studies have been conducted in the period 2013-2014 in the Fruit Growing Institute-Plovdiv. The goal was through mathematical and statistical analysis of experimental data to assess the influence of herbicides Metofen, Pledge 50 HR, Bonalin, Galley 334SL and Galley super, set in two doses, on the growth of in vitro propagated and rooted plants on t...

Dffirent types of wines according their optical characteristics-color parameters, lightness, brightness, angle of Hue and spectral coefficients of transmissions have been examined by using Single dispersion analysis (one-way ANOVA) and subsequent Duncan's test. For each investigated parameter the samples have been divided according their statistica...

25 olive oils were studied– different in origin and ways of extraction, in accordance with 17 physico-chemical parameters as follows: color parameters – a and b, light, fluorescence peaks, pigments – chlorophyll and β-carotene, fatty-acid content. The goals of the current study were: Conducting correlation analysis to find the inner relation betwee...

A total of 16 variants, including different water extracts from fruits and leaves of lingonberry, have been investigated and characterized with regards to the trails color parameters, pigments, phenolic acids and flavonoids. The variants have been obtained at different technological parameters – hydromodule, temperature of extraction and different...

The aim of this work was to evaluate (i) the effect of the type of vermicompost and (ii) the effect of the dosage of vermicompost on nutrient status and growth characteristics of tomato transplants; (iii) the variety response of tomato to vermicompost type and dose. The experiment was conducted in a greenhouse at Maritsa Vegetable Crops Research In...

Using Single ANOVA and subsequent Duncan's test is examined the influence of herbicides Metofen and 50VP Pledge, set in two doses, on the biometric indices stem height (cm) and thickness in the area of transplantqtion (nm) of yellow plum seedling. It is proven the Pledge 50 VP' inhibitory ffict on the height and the thickness in both applied doses....

During the period 2002 – 2003 nineteen Bulgarian and foreign pepper cultivars and Bulgarian breeding lines kapiya type are evaluated in yield at the Maritsa Vegetable Crops Research Institute, Plovdiv. The character variability in the studied genotypes is mainly due to the factor genotype and its interaction with the environment. Cultivars “Sofijsk...

The aim of the current study is to make co mparative analyses of the species from the genus Crocus L. in Bulgaria, based on the results from morphological, anatomical and cluster analyses. The results show identity in the arrangement of the species in groups between morphological study and the cluster analyses, while the results from the anatomical...

Cucumber mosail virus (ClW) and more closely related to Tomato aspermy and Peanut stunt viruses. The virus caused significant distorbances on bean plants expressed by severe mosaic, blisters, veinbanding and snrnting inthe growtb" From a bneeding point of view screening tests including domestic bean accessions were carried out aitnii to evaluate th...

A study was conducted at Plovdiv to describe the fruit morphological characteristics of pepper hybrids of Bulgarian and foreign cultivars, and to group the hybrids and cultivars by cluster analysis.