Vyzkumny ustav zemedelske techniky

Czech Republic

Vyzkumny ustav zemedelske techniky

Czech Republic
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Psenicnaja O.,Czech University of Life Sciences | Kotikova Z.,Czech University of Life Sciences | Hejtmankova A.,Czech University of Life Sciences | Lachman J.,Czech University of Life Sciences | And 3 more authors.
Chemicke Listy | Year: 2017

This paper deals with the determination of cis-/transresveratrol and piceid in the cake formed from the grape seeds by introducing and testing of the UHPLC-ESI/MS/ MS method. The cake is a solid residue remaining after pressing oil from grape seeds. It is a waste product in viticulture, which can be used for the extraction (isolation) of resveratrol, or as a dietary supplement for cattle. Samples were selected from the harvests of 2012 and 2013 from two different locations in the Czech Republic: Prague-Grébovka and Mělník. First results indicate that the concentrations of analytes are varietal dependent and affected also by the location and the year of the harvest. The highest levels of cisand trans-resveratrol were found in the cake of Pinot Noir and Zweigeltrebe variety. The values of trans-resveratrol obtained for 2012 and 2013 in Pinot Noir variety were 17.1 ± 1.7 μg g–1and 24.4 ± 1.6 μg g–1, respectively, in cisresveratrol 3.3 ± 0.1 μg g–1and 6.4 ± 0.3 μg g–1respectively. The values of trans-resveratrol obtained for 2012 and 2013 in Zweigeltrebe variety were 15.4 ± 0.2 μg g–1and 14.8 ± 1.5 μg g–1, respectively, in cis-resveratrol 2.1 ± 0.1 μg g–1and 2.1 ± 0.2 μg g–1, respectively. Both varieties have grown in Mělník. The highest content of trans-piceid was found in the cake of Hibernal variety (3.9 ± 0.2 μg g–1) from the harvest of 2013. The highest content of cis-piceid was determined in the cake of Dornfelder variety (2.5 ± 0.1 μg g–1) grown in Prague-Grébovka in 2013. © 2017, Czech Society of Chemical Engineering. All rights reserved.

Kucera L.,Czech University of Life Sciences | Bradna J.,Vyzkumny ustav zemedelske techniky | Malatak J.,Czech University of Life Sciences
Listy Cukrovarnicke a Reparske | Year: 2015

This study demonstrates the positive impact of application of molasses stillage as fertilizer for organically grown cereals. The best results were reached with stillage dosage of 3 t/ha-1. The tested cereals (spring barley and spring wheat) showed yield increase of 12% up to 19% (compared to control application) as well as increase in the weight of 1,000 seeds up to 6%. The parameters determining the grain quality were also positively affected by both doses of applied stillage, 3 t/ha-1 (pass through sieve, density, Zeleny’s test results) and 6 t/ha-1 (N-compounds, admixtures un/suitable for malting utilization, falling number). Stillage application had an insignificant influence on germination, moisture content, damaged grains, sprouted grains, and gluten content, all with test dosage. In case of admixtures and impurities an increasing dose of stillage caused them to decrease by 24–41%. Although several of the grain quality parameters showed the best results at the concentration of 6 t/ha-1, this increase had growing linear characteristics and increase in the values was observed already at the dose of 3 t/ha-1. Therefore, the dose of 3 t/ha-1 is considered to be the best having not only a positive impact on yield increase but also on the grain quality as such. © 2015, Listy Cukrovarnicke a Reparske. All rights reserved.

Kovaricek P.,Vyzkumny ustav zemedelske techniky | Maresova K.,Vyzkumny ustav zemedelske techniky | Hula J.,Vyzkumny ustav zemedelske techniky | Hula J.,Czech University of Life Sciences | And 2 more authors.
Listy Cukrovarnicke a Reparske | Year: 2010

In the article there is evaluated the effect of deep soil loosening and sowing of wide row crops with the use of minimal soil cultivation technology on water infiltration into the soil and on surface water run-off during the intensive rainfalls. The experimental activity was carried out in the production region with heavy clay-loam and loamy soils. The formation of ridges in the course of soil cultivation in autumn decreases significantly in the spring period soil moisture in ridge, increases soil porosity and improves hereby the warming-through of surface soil layer. It enables till by 14 days earlier date of sowing into ridges without any previous operation in comparison with areas cultivated by standard surface loosening. The suitability of deep loosening in autumn on heavy soils was proved by the method blue infiltration. In April 2008 the preferential paths for water infiltration into the soil created before maize sowing reached the depth corresponding to the recessing of skives. The water infiltration into the soil was evaluated at simulated constant rainfall 87,8 mm.h-1 (1,46 mm.min-1). The decreased surface water run-off and reduced water erosion have been influenced more than enhanced soil loosening in ridges by full-area soil loosening during the maize sowing by means of sowing combination with rotational cultivator.

Soucek J.,Vyzkumny Ustav Zemedelske Techniky | Burg P.,Mendel University in Brno
Acta Universitatis Agriculturae et Silviculturae Mendelianae Brunensis | Year: 2010

This work deals with determination of heating value by wood chips of waste cane of seven varieties of grape wine. The results show, that the highest values of heating power has variety Portugais Bleu (16,64MJ.kg-1) and MOPR (16,39MJ.kg-1). The wood chips from this varieties were at the same time with lowest values of all water volume (12,71 %-4,59%). Opposite the lowest values of heating power were by varieties Saint Laurent (15,93 MJ.kg -1) and Petit Riesling (16.10MJ.kg-1) with all water volume 49,09% and 41,97%. By the help of laboratory measurement, calculations and statistic evaluation of results was not show the influence of different varienties on funds of heating value.

New technical findings and experiences in number of mechanical damage and sugar beet losses during harvest by most widely used harvesters on the one hand and labor consumption during their determination in operation conditions on the other hand lead us to realization of experiment, if there is some possibility of reduction this labor consumption during experimental activities. With respect to stable actuality of this topic, although there were radical reducing of arable sugar beet areas in Czech Republic and using new principles of harvester's single working parts, there were verified new principles and harvesters, which are common in our sugar beet agriculture nowadays, there was experiment in comparison with older in our agriculture alleged principles and machines. After new acquired knowledge processing and evaluation this work should assist in final effect for practice technological and technical enhancement of harvesting and post-harvesting sugar beet treatment level and be one of the new science findings chain link on the topic of production quality versus technology.

Hula J.,Vyzkumny ustav zemedelske techniky | Hula J.,Czech University of Life Sciences | Kovaricek P.,Vyzkumny ustav zemedelske techniky | Kroulik M.,Vyzkumny ustav zemedelske techniky | Kroulik M.,Czech University of Life Sciences
Listy Cukrovarnicke a Reparske | Year: 2010

In the contribution there are mentioned the evaluation results related to water infiltration into the soil and surface water run-off during the artificial sprinkling of plots covered by various quantity of dead plant biomass on soil surface. The mulch on soil surface and in surface layer of soil contributed to a considerably later beginning of surface water run-off, than it was in case of variant without mulch. The mulch has also decreased a soil loss originating during surface water run-off on a steep land. In the conditions of a field trial there was found out, that the highest infiltration rate and minimum surface water run-off have been achieved in case of variant with sowing of maize into the dead stand of catch crop without spring presowing soil preparation. The lowest infiltration rate and with it related highest surface water run-off and soil loss have been recorded in case of traditional technology with ploughing, without catch crop. The results of measurements support the importance of soil protecting technologies used in growing of crops, which, don't protect the soil sufficiently from the effects of torrential rains (maize, sugar beet, sunflower).

Muzik O.,Vyzkumny ustav zemedelske techniky | Kara J.,Vyzkumny ustav zemedelske techniky | Hanzlikova I.,Vyzkumny ustav zemedelske techniky
Listy Cukrovarnicke a Reparske | Year: 2012

The contribution focuses on the potential of sugar beet pulps for biogas production. Laboratory experiments with biogas yield were carried out in a single stage, bath, mesophilic digesters with the volume of 1 litre. The experiment was divided into two series. The First series specified the specific methane yield from sugar beet pulps, the second verified possibilities of co-fermentation of sugar beet pulps with maize silage. The impact of biotechnological additives on methane yield was also tested in both variants. The experiments demonstrated that sugar beet pulps are a quality substrate for biogas production. Biodegradation of sugar beet pulps was fast and methane yield was relatively high. The highest methane yield of 330.9 l.kg-1 VS was reached within the retention time of 35 days. An even higher methane yield of up to 388.9 l.kg-1 VS was achieved at co-fermentation of sugar beet pulp with maize silage, but longer retention time of 55 days was required for biodegradation of the substrate. The experiment also demonstrated a positive effect of biotechnological pre-treatment on the process. Dosing of enzymatic additives increased the methane yield in both variants. The highest increase of 18.6 % was achieved at co-fermentation of sugar beet pulp and maize silage.

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