DSpace 7
DSpace is the world leading open source repository platform that enables organisations to:
- easily ingest documents, audio, video, datasets and their corresponding Dublin Core metadata
- open up this content to local and global audiences, thanks to the OAI-PMH interface and Google Scholar optimizations
- issue permanent urls and trustworthy identifiers, including optional integrations with handle.net and DataCite DOI
Join an international community of leading institutions using DSpace.
The test user accounts below have their password set to the name of this software in lowercase.
- Demo Site Administrator = dspacedemo+admin@gmail.com
- Demo Community Administrator = dspacedemo+commadmin@gmail.com
- Demo Collection Administrator = dspacedemo+colladmin@gmail.com
- Demo Submitter = dspacedemo+submit@gmail.com
Recent Submissions
Halophytes and salt tolerant wild plants as a feedstock for biogas production
(Plovdiv University Press “Paisii Hilendarski”, 2020-04-27) Kamel, Mohamed; Hammad, Sabah; Khalaphallah, Rafat; Elazeem, Mohamed Abd
This paper describes the ability of wild plants to be investigated as feedstock in biogas production. Anaerobic degradation of four wild halophytes and salt-tolerant plants (Avicennia marina, Tamarix nilotica, Zygophyllum album, and Zygophyllum coccineum) collected from the red seacoast in Egypt was studied. Lab-scale reactors were fed with dried and milled plant biomass.
Obtained results showed the highest biogas production result from A.marina 487.862 ml/VS (403.385 ml/TS) followed by T.nilotica 441.30 ml/VS (333.278 ml/TS) while 291.28 ml/VS (206.21ml/TS) and 127.923 ml/VS (81.272 ml/TS) for Z. album and Z. coccineum respectively. The chemical structure of these plants was the main factor controlling the variation in biogas production especially cations (Ca2+, Na+, K+, Mg2+) and organic fractions (volatile solids, crude fiber, crude protein). At high volatile solids with high protein content and low salt content, there was the highest biogas production in A.marina. on the other hand, increasing salt content decreasing biogas as Z. coccineum. That indicates the wild plants can represent a promising source for renewable energy and their solid digestate fraction can be used as bio fertilizer.
Inheritance of main quantitative traits in broad bean (Vicia faba L.)
(Plovdiv University Press “Paisii Hilendarski”, 2020-04-27) Georgieva, Natalia; Kosev, Valentin
The purpose of this study was to analyze the values of some genetic parameters of hybrid populations of Vicia faba, which would allow rational selection of desired genotypes in terms of main quantitative traits. The field trial was conducted during the period 2016-2018 at the Institute of Forage Crops (Pleven). Four cultivars (Fb 2481, BGE 002106, BGE 029055, BGE 032012) and their hybrids (Fb 2481 × BGE 002106, BGE 002106 × Fb 2481, BGE 029055 × BGE 032012, BGE 032012 × BGE 029055) were subjects of the study and their quantitative traits were observed in generations F1 and F2. Results showed that the plant height, seeds number and seed weight per plant in all crosses were inherited overdominantly. The alleles of the genes that determined more seeds per plant with an increased weight were dominant. The highest values of hypothetic and true heterosis in F1 were found in cross BGE 029055 × BGE 032012 regarding plant height (82.03%, 81.55%), in Fb 2481 × BGE 002106 – for 1st pod height (49.39%, 40.97%), in BGE 002106 × Fb 2481 – for pods number (36.05%, 32.95) and seed weight (225.47%, 161.36%), and in BGE 032012 × BGE 029055 – for seeds number per plant (117.77%, 96.89%). The coefficients of inheritance in all four crosses had medium to high values for the trait of seed weight per plant.
Legumes in soil surface maintenance system in mountain and biological fruit growing
(Plovdiv University Press “Paisii Hilendarski”, 2020-03-06) Bozhanska, Tatyana
The new methods of soil surface maintenance of the artificial grass establishment or growing of green manure crops applied in modern fruit-growing have been the subject of research in various Agra-ecological areas in Bulgaria but they are not yet implemented in the fruit-growing technology. Legumes are a basic element of these methods because of their nitrogen-fixing system. The present article summarizes our own and foreign results about the suitability of the different types of legumes in this trend. Bulgarian studies confirm the role of legumes in optimizing the nutritional and water regime of fruit crops in the conditions of mountain or biological fruit growing. In view of the fact that there are a wide variety of morphological and biological types of legumes in Bulgaria, it is reasonable to have a special selection of varieties for soil surface maintenance in orchards.
Correlation and regression dependences between quantity and quality indicators depending on fertilizing of bird's-foot-trefoil with humate fertilizers
(Plovdiv University Press “Paisii Hilendarski”, 2020-02-18) Churkova, Boryana
During the period of 2013-2015 in the experimental field of RIMSA-Troyan was conducted an experiment. The experimental design was a block with 4 replications with a plot size of 5 m2 of grassland with 'Targovishte 1' bird's-foot-trefoil cultivar. The following fertilizing variants were examined: control - null, phosphorus humate (3000 l'ha), boron humate (1600 l/ha) and molybdenum humate (1600 l/ha) and phosphorus humate (2500 l/ha) + boron humate (1000 l/ha) + molybdenum humate (1000 l/ha). On the basis of the data obtained from previous publications, correlation dependencies and regression equations are made between quantitative and qualitative indicators depending on fertilization with humate fertilizers. The crude protein content has been found to have high positive correlations with the percentage of leaves in the grassland (r = 0.8173) and the weight percentage of bird's-foot-trefoil (r = 0.7835), which allows the development of graphical regression models. There is a high correlation between the height of the plants and the relative share of the stems in the grassland (r = 0.8058), as well as between FUM and FUG (r = 0.9457). The high coefficient of determination between the percentage share of bird's-foot-trefoil and the quantity of the stems R2 = 0.9087 determines the equation of the regression dependence between these two components (y = 1.2167x-65,001).
Factors affecting population dynamic and preference of Acyrthosiphon pisum Harris in winter pea lines
(Plovdiv University Press “Paisii Hilendarski”, 2020-02-18) Nikolova, Ivelina
Population dynamics and preference of Acyrthosiphon pisum Harris on six winter pea lines in field condition were studied. Aphid number was recorded on marked plants by counting. The impact of several factors on the population growth and pea aphid choice during the period 2016-2018 was tracked. Weather condition strongly affected on the population dynamics of the pea aphid. The highest positive and significant effect on pea aphid infestation had the temperature (r = 6.748) followed by humidity (r =1.992). It was found that a peak in the aphid population density was reached in the sensitive stage of pod formation, as well as at flowering under a favorable weather condition. Among winter pea lines, lines 6 and 12A stood out with a significantly lower aphid density, nitrogen concentration and shorter generative period. They were much less preferred by aphids and defined as tolerant. Also, the interaction between aphid density and generative period as well as total nitrogen was positive and significant.