Luděk Hřivna

• Mendel University in Brno

Changes in the color of a Tuzemák distillate were monitored over a period of 24 months. The experiment was designed in cooperation with the manufacturer. The manufacturer was looking for a suitable type of bottle to sale the product. Dark and clear glass bottles with Tuzemák were stored in two temperature regimes (6 °C, 20 °C). The bottles were pla...

The effect on added pseudocereals (quinoa, amaranth, and buckwheat) on characteristics of beer was studied on beer samples prepared from barley malt, pseudocereals, water, hops, and brewer's yeast. Pseudocereals were used as a partial malt substitute (0%, 10%, 20%, 30%). The colour of laboratory prepared beers was measured using a Konica Minolta CM...

A series of small-plot field trials were conducted between 2019 and 2021 with the spring barley variety Francin. The impact of Vital Root and YaraVita KOMBIPHOS on the grain quality of malting barley at varying nitrogen fertilization rates (50 kg·ha-1 N, 70 kg·ha-1 N, 90 kg·ha-1 N, and 110 kg·ha-1 N) was investigated. The following parameters were...

Beer is a popular low-alcohol drink with a pronounced hop aroma and some bitterness. In beer you can find a large number of various nutrients and biologically active substances, including trace elements and vitamins.Based on color, beer is divided into light and dark, and depending on the type of yeast used, into lowand top-fermented beer.However,...

In this study, the effect of nitrogen doses (52, 80, 110, 140 kg/ha N) and the application of biostimulant preparations containing Ascophyllum nodosum L. algae extract were assessed. During the years 2018–2019, the influence of the preparations on the electrical capacity of the roots (C R) and yield components of spring barley was determined. Root...

Brewing industry is one of the most progressive and dynamically developing areas of the food and beverage industry in the world. In Kazakhstan brewing is currently the most developed segment of the beverage market. In recent years, production capacities have been increasing, the range of products has been expanding, and craft brewing has been devel...

Five different chocolate types (i.e. extra dark, dark, milk, white, and ruby) were characterized and compared for the acoustical and textural characteristics. Acoustic properties were described in terms of longitudinal and transversal wave velocities. These velocities were used for the evaluation of elastic constants namely Young modulus and Poisso...

The production of non-alcoholic beer requires brewing wort with a low degree of digestion. That is possible with the use of non-traditional raw materials in production. The research object presented below is grain sorghum varieties Kazakhstan-16 and Kazakhstan-20. Nowadays, the production of non-alcoholic beer with technological methods is not stud...

The chocolate mass behaves like a typical non-Newtonian plastic liquid defined by the yield stress and the plastic shear stress. The rotary rheometer with a cone-plate spindle system was chosen to determine the flow properties of chocolate masses. The effect of shear stress on shear deformation rates was measured at a temperature of 40 °C in an asc...

The aim of this study was to use unconventional malts in beer production and observe their effect on the wort viscosity. Six malts were analysed in this study—barley, black barley, oat, wheat, rye, and corn. Firstly, the parameters of cereals were measured after the malting process in an experimental malting house and wort production. Samples were...

Chocolate masses are one of the basic raw materials for the production of confectionery. Knowledge of their rheological and flow behaviour at different temperatures is absolutely necessary for the selection of a suitable technological process in their production and subsequent processing. In this article, the rheological properties (the effect of t...

The impact of storage temperature (6, 12, 20, 30℃) and period (2, 6, 10, 18, 26 weeks) on the texture, color, and sensory characteristics of dark and milk‐filled chocolate bars was studied. Temperatures of 6 and 12℃ were the most suitable for bar storage; these samples were evaluated not to be significantly deteriorated by the storage period. The c...

Proper organization of storage of raw sugar products allows for a long time to maintain product quality and minimize loss of its mass. Difficulties are associated with the high content of free water in them. We have studied the effect of ozone treatment on long-term storage of raw sugar products, including sugar beets. Sugar beet samples were taken...

M-Sunagreen and Primseed products applied to seeds by treating were tested in 2018. The effect of these applications on the root system size, formation of yield components, grain yield and its quality was evaluated. Seed treating by M-Sunagreen increased the yield by approximately 200 kg/ha, while the Primseed stimulant application increased the sp...

The aim of the study was to propose formulas with addition of bamboo and hemp fibre and grape seed flour in an amount of 3, 6 and 9% and then assess the effect of added fibre on the quality of biscuits. A total of 20 samples were baked, in half of the samples the basic ingredient was wheat flour, and in the rest of samples spelt flour was used. Dur...

The experiment included testing of rheological properties of dough as well as the baking quality of bread flour and bran obtained by grinding coloured wheat grains with purple pericarp (cultivars Rosso, Konini and PS Karkulka) and blue aleurone (cv. Skorpion). Common wheat cv. Mulan was used for comparison. Formulas containing 10, 15 and 20% of bra...

In 1999, the effect of increasing levels of nitrogen at the initial (13.9 mg.kg^–1) and increased (40 mg.kg^–1) level of watersoluble sulphur (S_wat) was studied in winter rape (cv. Lirajet) grown in pots. A synergetic effect of nitrogen on concentrations of Ca and Mg was demonstrated in the growth stages DC 20–29 and...

The effect of foliar nutrition of potassium and silicon was tested on tuber yield and technological quality in small field trials based on favorable precipitations in 2014 and dry conditions in 2015. The results of observation confirmed a positive effect of nutrition on yield and technological parameters of sugar beet in both years. In the first ye...

Gluten free (GF) flour (amaranth, buckwheat, chickpea, corn, millet and quinoa) was blended with rice flour to compare their impact on dough rheological characteristics and bread quality. The potential of some GF-rice blends in breadmaking has already been studied on blends with prevailing content of rice flour. The impact of added flour may be exp...

The effect of four storage temperature modes (6, 12, 20 and 30°C) on sensory properties of chocolate products and their colour changes in the experiment over a period of 6 months. The results were evaluated with regard to the production technology and composition of chocolate products. The experiment was performed on filled milk chocolate product c...

The impact of colored wheat bran addition on bread quality was tested on wheat varieties with purple pericarp (Konini, Rosso and Karkulka) and on a variety containing blue aleurone (Skorpion). The effect of 10 %, 15 % and 20 % bran addition on sensory evaluation, bread color and texture was compared to the characteristics of bread prepared from whe...

The influence of anthocyanins on antioxidant activity and liver function was measured in three different animal species (rats, chickens and fish). Purple Konini wheat with the total anthocyanin content (TAC) of 41.70 mg/kg was fed to the experimental groups of animals (rats n = 32; chickens n = 32; fish n = 20). The same numbers of animals (control...

The influence of anthocyanins on antioxidant activity and liver function was measured in three different animal species (rats, chickens and fish). Purple Konini wheat with the total anthocyanin content (TAC) of 41.70 mg/kg was fed to the experimental groups of animals (rats n = 32; chickens n = 32; fish n = 20). The same numbers of animals (control...

The aim of the work was to analyse different cannabinoids occurring in the food samples. The chromatographic data for the cannabinoids of interest namely Δ ⁹-Tetrahydrocannabinol (THC), cannabidiol (CBD) and cannabinol (CBN) were determined using gas chromatography. Hemp seed powder, hemp oil and hemp protein in various degrees of concentration wer...

The cannabis plant is one of the economic plants providing fiber, seeds and aromatic resin. It produces different terpene phenolic compounds, including psychoactive ∆ 9-tetrahydrocannabinol (THC). Cannabis plants used for food production should not exceed 0.2% THC. The presence of THC in food can be detected by chemical or biological analytical met...

The cereals grains are excellent sources of digestible carbohydrates, dietary fiber, and proteins in addition to providing vitamins (group B and vitamin E) and minerals (zinc, phosphorus, selenium, and iron). The whole grain cereals contain high levels of bioactive phytochemicals, such as antioxidants that could provide protective effects against h...

This paper deals with the possibilities of using products derived from industrial hemp in creating recipes of common bakery products. The food industry may use only industrial hemp products containing less than 0.3% of THC. Nine recipes were created during testing, in which addition of hemp oil, hemp grits, hemp flour and hemp protein added to whea...

This paper deals with the application of flour, obtained by milling wheat varieties with colored pericarp (Rosso, Karkulka) and blue aleurone (Scorpion); and hemp products (hemp grits, hemp protein) for the production of bakery products. For testing purposes nine recipes ware created, 10% of hemp grits or 5% of hemp protein were added to the wheat...

This work is focused on the evaluation of the content of deoxynivalenol and zearalenone in samples of winter wheat of the following varieties: Sultan, Cubus, Akteur, Seladon, Mulan, Chevalier, Evina, Hewitt, Bohemia, Baletka. The total amount of 10 samples harvested in 2011 and 2012 was evaluated and included variants both treated and untreated aga...

The aim of the three year research was to determine the first occurrence of Delia antiqua (Meigen, 1826) (Diptera: Anthomyiidae), specify its bionomics, compare its harmfulness on different garlic varieties, find out the effect of temperature on their life cycle and how their abundance influences garlic yield in regional agriculture areas tradition...

The effect of calcium and sodium caseinate supplements (2 g/100 g) on the behavior of rice-buckwheat dough and bread quality was compared to the effect of xanthan gum and carboxymethyl cellulose. The addition of caseinates significantly (P < 0.01) increased dough weakening, which became similar to dough with xanthan gum. During heating, the gelatin...

Grain hardness is one of the most important quality characteristics of wheat (Triticum aestivum L.). It is a significant property of wheat grains and relates to milling quality and end use quality. Grain hardness is caused by the presence of puroindoline genes (Pina and Pinb). A collection of 25 genotypes of wheat with unusual grain colour (blue al...

Hemp is diploid organism (2n = 2x = 20, genome size 534 Mb) with nine pairs of autosomes plus XX (♀) or XY (♂) chromosomes. Cannabis sativa L. is an important economic plant for the production of food, fibre, oils, and intoxicants. Genotypes (varieties or chemovar) of hemp with low Δ9-tetrahydrocannabinol content are used for industrial application...

Cannabis sativa L. (hemp) is one of the oldest cultivated plants used around the world for diverse applications. 22 genotypes of hemp were analyzed with 16 SSR markers (8 SSR markers " ANUC " and 8 SSR markers " CAN "). Used primers amplified 76 different polymorphic alleles with an average number of 4.75 alleles per locus. The number of alleles ra...

Cannabis, or hemp, (Cannabis sativa L.) has been grown for thousands of years all around the world for its valuable traits in fabric making industry and traditional medicine. Today it is still considered as an important crop and medicinal plant. The most studied cannabinoids, secondary metabolites of genus Cannabis, are ∆-9-tetrahydrocannabinol (TH...

This experiment is focused on the influence of malt produced from purple Konini wheat, which underwent kilning at 80°C, 100°C, and 120°C, on the resulting quality of the top-fermented beer. In the production of six different samples of beer we have used two ratios of barley and wheat malt (50:50, 70:30). Individual samples were subjected to sensory...

Coloured wheat represents an interesting raw material for the food industry not only in terms of new products, but also for its positive effects on human health. We have tested four varieties of coloured wheat – Konini, Rosso, Scorpion, and UC66049. From the milling fractions obtained by milling grains of coloured wheat, we have compiled 11 pastry...

Winter wheat varieties "Rosso" and "Skorpion" were cultivated in 2013–2014 in small-plot field trials. A half of variants were fertilized only with nitrogen as part of regeneration and production fertilization, while the other part was fertilized with sulfur and nitrogen. The total dosage amounting to 184 kg of nitrogen per hectare and 94 kg of sul...

A small-plot field experiment was set up during 2011, 2012 and 2013 to test the effect of nitrogen (N) fertilizers and nitrogen fertilizers combined with sulphur (S) in the nutrition of spring barley cv. Bojos. The following parameters were studied, the effect of fertilization on grain yield, specific weight, percentage of the grain retained on a 2...

This study assessed and compared the influence of feeding wheat with purple pericarp (variety Konini) and standard coloured wheat (red variety Bohemia) on the growth characteristics of fingerling carp (Cyprinus carpio L.) of the “Amurský lysec” line. The total content of anthocyanins converted to cyanidin 3-glucoside in the control Bohemia wheat wa...

The study aimed at assessing changes in the quality of certain types of chocolate products over the storage period with particular focus on the formation and development of fat and sugar bloom in chocolate products. Seven products were selected in collaboration with a chocolate factory to undergo monitoring and analysis and stored at four temperatu...

The work deals with the importance and quality of poultry meat. It describes the evaluation of the quality of poultry meat and principles for the organoleptic assessment. The experiment with broiler male chickens Ross 308 was made. The chickens were divided into 4 groups and fed with a feed mixture which content 60% and 30% of yellow wheat Citrus (...

The influence of two storage temperatures 5 - 7 degrees C and 2 - 4 degrees C was monitored on seed potatoes with different cooking type. The effect of reducing sugars and starch in seed potatoes on the initial growth rate of haulms and effect on the sensory quality after cooking were determined. There was the lowest decrease in starch content for...

The influence of sulphur fertilization on plant dry weight, grain yield and quality of wheat grain (var. Mulan) was investigated. Wheat was grown in the small plot field experiments conducted in 2011–2012. At the beginning of tillering, the regenerative sulphur fertilization increased dry plant weight and sulphur concentration in dry matter by 28.1...

The field trial focused on utilization of nitrogen and sulphur and their translocation into the tops and roots of sugar beet during the second phase of vegetation. In plants, sulphur is directly associated with nitrogen metabolism, therefore relationships between these two elements were assessed. In 2011, a significant variability of nitrogen trans...

The aim of this study was to determine effect of purple wheat Konini included in feed ratio for fattening male broilers of hybrid combinations Cobb 500. Konini wheat has a higher content of anthocyanins (14.01 mg / g) in grain. The content of crude protein in the common wheat was increased using wheat gluten to the identical in KONINI. In both feed...

The aim of the study was to assess the possibilities of using grain mill products (flour, semolina and bran) obtained by milling purple grain wheat (variety Konini) in bakery products. The attention was focused on the use of bran with high levels of anthocyanins characterised by high antioxidant capacity. Mixtures were prepared with the mixture of...

Granule-bound starch synthase (GBSS) is a key enzyme in starch biosynthesis pathway. It is responsible for production of amylose, therefore low amylose level has been associated with GBSS deficiency. This enzyme, also known as waxy protein, is encoded by three homologous genes – Wx-A1, Wx-B1 and Wx-D1 and their dysfunction of any origin causes decr...

The influence of feeding of purple wheat KONINI (14.01 mg/g of anthocyanins) on antioxidant activity measured in the liver tissue of rats was determined. 64 male rats of Wistar Albino strain were used in the experiment. Experimental group was fed by ration which content 100% of purple wheat KONINI. Control group was fed by ration with 100% of commo...

The influence of yellow wheat Citrus with high content of lutein in comparison with common wheat on antioxidant activity of the rat liver tissue was measured. In the experiment, 32 male rats of Wistar strain were used. The influence of the feeding of yellow wheat varieties Citrus on antioxidant activity was measured in the blood and liver tissue. T...

Iodine deficiency termed "hidden hunger" in medicine has become a problem in many countries around the world. This article examines the issue of reducing iodine deficiency through fortifying the socially necessary product - wheat bread. The author conducts a study of the amino-acid composition of wheat bread with the use of a functional supplement...

In the years 2011 and 2012, a small plot field experiment was set up monitoring the influence of boron application on yield and technological quality of sugar beet. The yield of leaves was almost twice higher in 2011 (62.6 t ha-1). On the other hand, the yield of roots was higher in 2012 (107.6 t ha-1). Also in 2012, higher average sugar content (1...

Garlic pests have been observed on the following five study plots named Nedakonice (178 m), Olomouc (241 m), Dolní Němčí (256 m), Suchá Loz (306 m) and Vápenky (484 m) in 2010-2012. The occurrence of pests has been found out on winter varieties Dukat and Blanin using various monitoring methods during the vegetation. Most adults Oprohinus suturalis...

The article considers the problem of improving the nutritional value of wheat bread by making functional additives. The content of essential trace elements magnesium is increased in several times and also increases the content of vitamins, essential amino acids and antioxidant activity. The aim of this work is to create a new assortment of bread pr...

The research was conducted to describe distribution of protein fractions in wheat (Triticum aestivum L.) mill products (semolina, flour and bran) and evaluate the possibility of prediction of protein fractions distribution from values of bread-making quality (protein and gluten content, Zeleny sedimentation volume) evaluated on wholemeal and specif...

Within monitoring of sugar beet growing in Central Moravia region we focused on evaluation of dependence among selected quality parameters during vegetation period. A medium-strength negative relation between the weight of leaf area and sugar content was determined; this relatin was most distinct during the last sampling (r = -0.576**). The root we...

The work was conducted to determine the practical applicability of size-exclusion high performance liquid chromatography in testing wheat bread-making quality and specify which of the peak characteristics, is the best indicator of wheat quality. The research was realized on 29 cultivars of different quality. The wheat quality was evaluated by prote...

The effect of extra-root nutrition on sugar beet growth and development during vegetation period was examined in field trials. Simultaneously, yield and technological quality of tubers were evaluated. Sugar beet leaf area was increasing until August when it reached 715 grams per plant. Conclusively highest weight gains were noticed between 28th Jul...

The intensity of garlic infestation by dry bulb mite Aceria tulipae (Keifer, 1938) was observed on different garlic varieties in central Moravia. The aim of this study was to determine infestation of different garlic varieties during storage in the winter period 2011-2012. Current studies on 11 garlic varieties from the Centre of the Region Haná at...

Prace byla zaměřena na hodnoceni průběhu posklizňoveho dozravani u osmi odrůd sladovnickeho jecmene jarniho registrovaných v Ceske republice. Byly sledovany parametry kliceni (energie, rychlost, index, průměrný cas a homogenity kliceni) v průběhu 3., 6., 9. a 12. týdne. Ziskane udaje byly vloženy do vztahu k fenologickým fazim a průběhu pocasi za r...

V ramci maloparcelnich polnich pokusů byl v letech 2005-2009 sledovan vliv aplikace siry a dusiku (N1 = 30 kg N.ha-1, N2 = 50 kg N.ha-1) během vegetace na obsah skrobu a bilkovin v zrnu jecmene odrůdy Jersey. Dale byl stanoven obsah sirných aminokyselin v zrnu jecmene i sladu a obsah prekursorů dimethylsulfidu ve sladu. V průměru nejvyssi obsah skr...

K ziskani rychle informace o extraktu zrna jecmene je použivan vztah podle Bishopa, který byl ziskan experimentalně a pro potřeby moderniho sladovnictvi byl několikrat modifikovan. Stanoveni přesneho obsahu extraktivnich latek zrna je casově narocne a provadi se po sladovani zrna v kongresni sladině dle metodiky EBC 4.5.1. Cilem teto prace bylo sta...

Bioethanol can be used as motor fuel and/or as a gasoline enhancer. A high yield feedstock for bioethanol production is cereal grain. Cereal grains containing less gluten proteins (glutenin and gliadin), but high starch, are favoured by distillers because they increase the bioethanol conversion. The direct effect of wheat gluten proteins on bioetha...

The study observed the occurrence of di- n -butyl phthalate (DBP) and di-(2-ethylhexyl) phthalate (DEHP) in the soil and agricultural crops ( Triticum aestivum, Brassica napus, Zea mays ) and their distribution to the individual parts. For the experiment were selected 4 locations in central Moravia. At two locations (L1, L2) winter wheat ( Triticum...

In 2005–2008, the effect of zinc foliar application (0.5 kg/ha in DC 31 and 55 growth stage in the form of the Zinran fertilizer containing sulphate and zinc oxide – 19.8 and 52.3 %) on the size of the plants root system (its electric capacity in DC 23 and 57 was measured), the yield and quality of grain, and the course of the sweet wort fermentati...

V letech 2005-2008 byl sledovan vliv listove aplikace zinku (0,5 kg.ha-1 v DC 31 a 55 ve formě hnojiva Zinran s obsahem siranu a oxidu zinecnateho - 19,8 a 52,3 %) na velikost kořenoveho systemu rostlin (měřena jeho elektricka kapacita v DC 23 a 57), výnos a kvalitu zrna a průběh kvaseni sladiny u sesti odrůd jecmene jarniho (Bojos, Jersey, Kompakt...

V ramci ctyřletých maloparcelnich polnich pokusů byl ověřovan vliv aplikace dusikatých hnojiv se sirou na vybrane parametry kvality zrna jecmene a sladu se zaměřenim na tvorbu prekurzorů dimethylsulfidu (PDMS). Kombinace nižsi davky dusiku (30 kg.ha-1) se sirou zvysovala výnos zrna průměrně o 0,2-0,34 t.ha-1; u vyssi davky dusiku (50 kg.ha-1) aplik...

The objective of the three-year small-plot trial was to assess the effect of the weather of the year, forecrop, variety, form of sulphur (elementary and sulphate) and additional nitrogen fertilising on the yields and the content of N-substances of the malt barley varieties Jersey and Sebastian. The trial was carried out in 2006-2008 at the experime...

In the course of 2003-2004, experiments were conducted in which the effect of selected fertilizers designed for non-root nutrition of sugar beet was monitored. The results showed that the effect of the leaf nutrition is variable depending upon weather conditions. The time of application was the key factor that had direct influence on the yield in 2...

In small-plot experiments established in 2001-2004 we studied the effect of the chemical composition of the plant dry matter of spring barley, varieties Kompakt and Jersey, on grain yields. A relatively strong correlation was confirmed between the chemical composition of the plant dry matter and yields. The correlation was most intensive in the cas...

Activity of alpha-amylase enzyme (EC 3.2.1.1) is considered to be primarily essential for barley’s (Hordeum vulgare L.) seed germination and crucial for malting and beer processing. The aim of this study was to evaluate: (i) the activity of alpha-amylase enzyme in spring barley varieties recommended for Czech Beer production (Bojos, Malz and Tolar)...

Root system size (RSS) was measured in 6 barley varieties using electrical capacitance. Estimates of RSS were taken twice during plant development: 3 tillers detectable (RSSI) and middle of heading (RSS2). The barley varieties were assessed during three years on the Zabcice (N49 degrees 01 E16 degrees 36') site (CZ). Grain yield (t.ha(-1)), nutrien...

In 2001–2004 an influence of gradually increased portions of nitrogen (100–130–160 kg/N.ha –1 ) applied on the wheat variety Ebi in combination with the modified fungicidal protection in the yield and the selected quality grain parameters were observed within the small-plot field trials. Nitrogenous fertilizers according to the amount of nitrogen c...

Small-plot trials for determination of the losses on production and quality of sugar beet bulbs after simulated defoliation of plants were made in 2004 and 2005. The study was conducted at the experimental station of plant production of School Agricultural Company of the Mendel University of Agriculture and Forestry in Žabčice (corn production regi...

Within the project of small-plot field trials we cultivated 10 varieties of winter wheat in 5 different trial stations of the Central Institute for Supervising and Testing in Agriculture in years 2001–2002. The yields achieved were assessed and the miller’s quality of the grain was defined. Wheat variety Contra reached the highest yields (10.226 t....

The impact of fertilizing containing combination of nitrogen and sulphur on the N-substances contain in grain and the share of particular proteinous fractions of wheat of Samanta species was researched within the small-allotment trials in years 2000–2001. It has been proved that application of nitrogen together with sulphur positively influenced th...

Sugar beet belongs to the crops with medium uptake of sulphur. The sulphur is mainly concentrated in leaves, some 75 % of the total content in the plant. The sulphur uptake is the highest in time of maximum leaves development during July. The dynamism of the sulphur uptake corresponds with the uptake and utilization of nitrogen. According to the ra...

In small-plot field trials conducted in 2000–2002 we studied the effect of fungicides on the yield and selected techno-logical parameters of grain of malt barley and on malt. For the treatment we used Cerelux (active ingredients: fenpropi-morph, flusilazole), Amistar (azoxystrobin) and Caramba (metconazole) applied in two stages of stand developmen...

In 1999, the effect of increasing levels of nitrogen at the initial (13.9 mg.kg –1) and increased (40 mg.kg –1) level of water-soluble sulphur (S wat) was studied in winter rape (cv. Lirajet) grown in pots. A synergetic effect of nitrogen on concentra-tions of Ca and Mg was demonstrated in the growth stages DC 20–29 and 31–39. Levels of P and K wer...

In a polyfactorial field experiment conducted in 1998-2000 we studied the effect of three systems of sugar beet top management, two sowing rates and two levels of nitrogen fertilisation, and their interaction, on production parameters of the spring barley variety Kompakt. Based on statistical evaluations using the variance analysis, it was found th...

In pot experiments conducted in 1997-1999 we studied the effect of increasing doses of N (0.3, 0.6, 0.9 and 1.2 g per pot) under the increasing content of water-soluble S in the soil (13, 20, 30, 40, 50, 60 and 90 mg,kg-1 of soil) and constant nutrition with other nutrients on the concentration of N and S in winter rap (variety Lirajet) in the DC 3...

Mendelova univerzita v Brně Úvod Hnojení sírou může do jisté míry ovlivnit výnos i kvalitu zrna ječmene (HŘIVNA ET AL., 2007). MCGRATH ET AL. (2002) prokázali zvýšení výnosu zrna ječmene po aplikaci síry o 1,1t.ha -1 (o 34,9%). Aplika-ce síry přispěla také ke snížení obsahu dusíku v zrně z 1,95% na 1,8%, což bylo pravděpodobně v důsledku zřeďovacíh...

Mendelova univerzita v Brně Úvod Řada autorů prokázala interakci v příjmu mezi dusí-kem a sírou. MCGRATH ET ZHAO (1996), HŘIVNA ET AL. (2001) zjistili, že nedostatek síry může efekt hnojení dusíkem snížit. Na druhou stranu při nadměrném hnojení dusíkem v kombinaci se sírou můžeme kvalitu ječmene ovlivnit nega-tivně. Luxusní příjem dusíku vede k jeh...

Mendelova univerzita v Brně Zásady pěstitelské technologie u sladovnického ječmene jsou všeobecně známy a podrobně zpracovány v monografii Ječmen (Zimolka a kol 2006). Pro tuto nosnou komoditu a její dobrou realizaci na trhu rozho-duje vedle výše výnosu hlavně obsah N-látek. S ohledem na časté změny v průběhu počasí v posledních letech se dostává d...

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