National Repository of Grey Literature 13 records found  1 - 10next  jump to record: Search took 0.00 seconds. 
Vliv kvality osiva na polní vzcházivost a výnos pěstovaných obilnin.
The Bachelor thesis is focused on seed properties germination capacity, 1,000-grain weight, moisture in spring wheat Epos and Vánek and in spring barley Aktiv and Bojos. Laboratory tests were carried out in the analytical laboratory SEED TEST Planá nad Lužnicí. Samples for analyses were taken in ČSO Pacov and all parameters complied with requirements for certified seed. Each of the grain varieties from the same lot was sown in three fields owned by agricultural cooperatives and private farmers. Some basic yield components a number of plants per m2 and a number of ears per m2 were monitored and evaluated in the fields during the growing season. Yields from each field and 1,000-grain weight were determined after the harvest.
Barley growing in conventional and organic farming system - plant protection methods and greenhouse gases emissions
BÍNA, Martin
The aim of this diploma thesis was an evaluation of the environmental aspects of growing of the chosen feeding varieties of a spring barley in various systems of farming. Further purpose of this diploma thesis was a quantification of an emission load bond with the unit of area, and the unit of yield of spring barley, in the scope of conventional and ecological system of farming. The part of this study was a formation of the literature survey about problems of the conventional and ecological growing of the spring barley, with the focus on the agrotechnical requirements and environmental aspects. The practical part was performed in the area of the Faculty of Agriculture in Czech Budejovice.
Uptake and Distribution of Chlorphenols in Barley
Jíšová, Tereza ; Forczek, Sándor ; Tesařová, E.
Chlorinated phenols represent one of the most common groups of toxic industrial compounds.\nThey are resistant to biodegradation in the environment and persist for a long time. Food crops\nsuch as spring barley, are susceptible to contamination by various pesticides and organic waste,\nand these substances can then get into the plants. Uptake and distribution of 2-chlorophenol were\ninvestigated in axenic spring barley. After absorption of 14C-labelled 2-chlorophenol, the plants\nwere harvested and extracts were analyzed for 2-CP derived radioactivity. The uptake of 2-CP to\nroots and transport to leaves were confirmed. Radioactive balance was calculated for individual\nplants.
Crop yield estimation in the field level using vegetation indicies
Jurečka, František ; Hlavinka, Petr ; Lukas, Vojtěch ; Trnka, Miroslav ; Žalud, Zdeněk
Remote sensing can be very useful tool for agriculture management. In this study, remote sensing methods were applied for yield estimation in the field level. There were compared remote sensing data together with yield data obtained from the field. The study area is located in Polkovice in Olomoucký region and a crop planted there in the year 2016 was spring barley as one of most important crops grown in the region. The study area in Polkovice is located at lower elevations with intensive crop production and is climatologically warmer and drier than other areas of the Czech Republic. Year 2016 was the first year when the harvest device has been used for yield analysis in this study area. The output of this method is the yield map displaying the amount of crop harvested in the particular place in the field. The yield data from the field were then compared with remote sensing data in the form of vegetation indices. Two of them were used for comparison – Normalized Difference Vegetation Index (NDVI) and a two-band Enhanced Vegetation Index (EVI2). These indices have been often used for yield estimation in different studies but mostly in larger scales. This study investigates use of NDVI and EVI2 at more detailed scale while using various remote sensing methods. Comparisons show that remote sensing data can provide accurate estimation and can be used for yield forecasting or supplement traditional ways of yield estimation. Results of the study show that yield-index correlations are stronger for satellite data than for the drone data. NDVI showed slightly stronger correlations than EVI2. Strongest correlations between vegetation indices and yields were found for NDVI from Sentinel 2.
Yield formation and quality of spring naked and hulled barley
On the grounds of the South Bohemian University was founded in 2015 oneyear experiment. In this experiment we compared three classical and one naked variety of spring barley. Each variety were planted in four replications. For each repetition was assessed the number of emerged plants, number of tillers, number of ears, yield, thousand grain weight, the proportion of leading grain, density andcontent of nitrogenous substances. The average yield of the hulled varieties exceeded 6 t/ha, while in the nudevariety was 4,68 t/ha. The nude variety also showed the lowest HTZ, highest densityand the highest content of nitrogenous substances.
The influence of reduced precipitation supply on spring barley yields and the ability of crop growth models to simulate drought stress
Pohanková, Eva ; Orság, Matěj ; Hlavinka, Petr
This paper evaluates the first year (2014) of results from a field experiment with spring barley (cultivar Bojos) under reduced precipitation supply. The field experiment was carried out at an experimental station in the Czech Republic and consisted of small plots in two variants and three repetitions. The first variant was uncovered, and the second was partly covered to exclude rain throughout the entire vegetation season. For plots’ partial covering, a material was used to divert rainwater away from 70% of the plots. The main aim was to determine whether there are any differences in soil water content or in grain yield size between uncovered and partly covered plots and to compare the results obtained. Data measured in this field experiment were used to compare simulations of this field experiment in the DAISY crop growth model. Subsequently, the crop growth model’s ability to simulate grain yield, which was affected by drought stress, was explored. In reality, differences in phenological development and grain yield size were not evident. Reducing precipitation supply in DAISY by about 70% led to simulations of covered plots with reduced grain yield in accordance with the initial hypothesis. Agreement between observed and simulated grain yield was evaluated using selected statistical indicators: root mean square error (RMSE) as a parameter of average magnitude of error and mean bias error (MBE) as an indicator of systematic error. RMSE of grain yield was 2.6 t ha−1. MBE revealed grain yield undervalued by 2.6 t ha−1.
Use measuring of spectral reflectance and derived specialized vegetation indices in the crop management practices of spring barley
Klem, Karel ; Míša, P. ; Míša, M. ; Křen, J.
The methodology gives users the possibilities of practical use of spectral characteristics of vegetation, specialized vegetation indices NDVI and NRERI, in the process control in crop management practices of spring barley. It contains instructions for measuring indices NDVI and NRERI as well as principles of agronomic interpretation. Practical applications of measurement results are oriented in spring barley crop management practices (nitrogen nutrition regulation, treatment stands to lodging, yield estimation, prediction of the content of N-substances in the grain).
Analysis of Spring Barley Actual Evapotranspiration
Pozníková, Gabriela ; Fischer, Milan ; Pohanková, Eva ; Žalud, Zdeněk ; Trnka, Miroslav
Evapotranspiration (ET) represents the main water-loss part of the water balance in agricultural landscape. The reliable quantification of the agricultural field ET is, however, still a challenge. To calculate ET, the Bowen ratio/energy balance (BREB) method was used in this study. It is based on measurements of the temperature and humidity gradients and radiation balance with the soil heat flux. Calculated ET was further used to quantify crop coefficient (Kc). Subsequently, we analysed the crop coefficient of spring barley during one growing season since 7th May 2013 to 30th July 2013. We used the data obtained above 1-ha spring barley field in Bystřice nad Pernštejnem, Czech Republic. In particular, we investigated how Kc correlates to climatic conditions as rainfall and soil humidity and how it reflects Plant Area Index (PAI) during the year during different parts of growing season. The cumulative ET of spring barley was 228.6 mm per investigated period. For reference evapotranspiration (ETo) two different approaches were used. Typically, a reference grass cover 0.12 m high standard for Europe. On the other hand, in the USA it is common to use also alfalfa (0.50 m high). ETo of grass was 296.3 mm and ETo of alfalfa was 351.4 mm. Maximum Plant Area Index occurred in June and its value was 4.1. Mean Kc in May was 1.17 for reference grass and 1.03 for alfalfa. Similarly in June, Kc was equal to 1.16 (grass) and 1.03 (alfalfa). Finally in July, for reference grass Kc was 0.55 and 0.48 for alfalfa. The decline at the end of the growing season was caused by dry weather and ripe stage of spring barley.
The quality of barley for food and feeding
By the purchasing of malting barley and fodder barley from collective farms, companies, smaller enterprises and also independently farming farmers the quality is evaluated by indicators which are determined by valid standards. A range of factors participating in resulting grain quality. The quality criterions and laboratory methods were created in order to specify the quality of barley in the company laboratory ZZN Pelhřimov. Average values of the results of analysis of malting barley in years 2008 - 2012 were compared wiht the national average which its yearly evaluated by ČÚPS in Brno. In addition to the genetical base the malting quality is mostly influenced by the sequence weather in individual years.

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