Iskanje po katalogu digitalne knjižnice

Opis: In 2013 and 2014, a long-term trial (which was established in 2007) was conducted at the University Agricultural Centre in Pivola near Hoče. It included different production systems (conventional, integrated, organic, biodynamic), carried out in a field trial with oil pumpkins. The aim of the research was to analyse the effects of different production systems, varieties (hybrid and population variety) and years of production, on formation of oil pumpkin yields. The agricultural practice has been carried out in accordance with the applicable legislations and standards for the individual production system. When sowing, before fertilizing with nitrogen in early June and after the harvest, the amount of soil mineral nitrogen was monitored. We evaluated the number and weight of harvestable, unripe and decayed fruits, and yield of oil seed pumpkins and calculated the agronomic efficiency of the applied nutrients. The results showed that the year of production, the production system and the variety have a significant effect on some fruit characteristics and the yield of oil pumpkin seeds. The content of soil mineral nitrogen in May and September was significantly influenced by the production system and the year. In June, only the production system had a significant effect. The hybrid significantly increased the yields of oil pumpkin seeds in all production systems, even in the year that was less suitable for production. The agronomic efficiency of the applied nutrients in the biodynamic and organic production system is higher or equal than in the conventional production system, similarly, agronomic efficiency is higher in the hybrid compared to the oldest population variety efficiently. A comparable oil pumpkin yield can be expected in biodynamic and organic production, when proper nutrition and well carried out cultivation practices are combined with a new variety, when compared to less sustainable production systems, which often cause damage to the environment.
Ključne besede: production systems, variety, oil pumkins, mineral nitrogen, agronomic efficiency, yield
Objavljeno v DKUM: 10.10.2018; Ogledov: 2139; Prenosov: 368
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Opis: Fifty samples of natural mineral waters from springs in Slovenia, Hungary, Germany, Czech Republic and further countries of former Yugoslavia have been analysed. The mass concentration of cations ($Na^+$, $K^+$, $Ca^{2+}$, $Mg^{2+}$, $Fe^{2+}$, $Mn^{2+}$, $NH^+_4$) and anions ($F^-$, $Cl^-$, $I^-$, $NO^-_3$, $SO_4^{2-}$, $HCO_3^-$), the spring temperature, pH, conductivity and carbon dioxide mass concentration have been measured using standard analytical methods. Appropriate statistical methods and different chemometric tools were used to evaluate the obtained data, namely, (i) descriptive statistics, (ii) principal component analysis (PCA), (iii) cluster analysis, and (iv) linear discriminant analysis (LDA). It was confirmed that Slovenian natural mineral water samples differ most from the German ones but are relatively similar to the Czech and Hungarian ones. Water samples from Hungary are similar to waters from the eastern part of Slovenia.
Ključne besede: natural mineral water, ion determination, principal component analysis, cluster analysis, linear discriminant analysis
Objavljeno v DKUM: 21.12.2015; Ogledov: 1866; Prenosov: 100
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Opis: Two apple (Malus domestica Borkh) cultivars grafted on M9 rootstock were grown on high density ('Jonagold' 2500 trees/ha, 'Golden Delicious' 3000 trees/ha). There were five treatments for each cultuvar (fertirigation with 45kg N/ha, 60 kg N/ha, 120 kg N/ha, irrigation without fertilisers, and control- without irrigation and without fertilisers), and two timing variants (treatments during vegetation period from 1 May to 20 June - variant A, and treatments from 1 May to 1 August - variant B). The treatments were impossed beginning in the second year after planting and lasted seven years (1992-1998). Concentration of microelements in leaf was determined over the 7th and 8th growing season. During the season 1997/98 effects of the applied treatments on leaf mineral content were notable, but these effects often were not consistent. There were no significant timing effect on leaf nutrient concetration of both cultivars. During the cropping years (1993-1998) there were no consistent treatment effects for cumulative yield and cumulative yield efficiency. The highest cumulative yield achieved 'Jonagold' in the control, while 'Golden Delicious' performed best when it was fertilised with 45 and 60 kg N/ha.__
Ključne besede: Malus domestica, mineral nutrition, Fe, Cu, B, Malus domestica, mineralna ishrana, Fe, Cu, B
Objavljeno v DKUM: 10.07.2015; Ogledov: 1271; Prenosov: 44
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Ključne besede: rastni regulatorji, varstvo rastlin, pšenica, pridelek, Mineral
Objavljeno v DKUM: 10.07.2015; Ogledov: 1343; Prenosov: 48
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Opis: This article analyses the impact of soils` mineral composition on their compressibility. Physical and chemical properties of minerals which influence the quantity of intergrain water in soils and, consequently, the compressibility of soils are established by considering the previous theoretical findings. Test results obtained on artificially prepared samples are used to determine the analytical relationship between the water content and stress state, depending on the mineralogical properties of the soils. A practical applicability of the established interdependence is verified on fiverandomly selected samples of natural soils. The selected approach to the analysis of the influence of soils composition on the water content at different stress states allows for the first time to establish generally validcriteria for determining such relationship.
Ključne besede: soil mechanics, clays, specific surface, compressibility, mineral composition
Objavljeno v DKUM: 30.05.2012; Ogledov: 1869; Prenosov: 149
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