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Influence of term of winter rapeseed (Brassica napus) desiccation on yield and seed quality
Rajtmajer, Stanislav ; Bečka, David (advisor) ; Petr, Petr (referee)
Rapeseed is the world's third most important oil plant (the second seminal). It is the most cultivation and most important oil plant in Czech Republic. Winter rapeseed reaches about 85% of the harvest area of oilseeds in the country. The desiccation of oilseed crop is sphere of agricultural engineering, which is still worth discussing. The main problems are how to use the product, what dose and which dates to choose to desiccate. The results of this thesis could help to partially clarify this complex issue.
The aim of the thesis is to observe the effect of different terms oilseed rape desiccation by glyphosate on yield and seed quality.
Small-plot experiments to investigate the influence of the term desiccation of winter rapeseed were established in the years 2013/2014 and 2014/2015 on the lands of the experimental station of the Czech Agricultural University, Faculty of Agronomy Food and Natural Resources at the Červený Újezd.
In the first experimental year 2013/2014 was founded five variants in three replications (including undesiccated control). In the year 2014/2015 was founded seven variants in four replicates (including undesiccated controls). In the first experimental year was the first term desiccation 16. 6. 2014, the second year 8. 6. 2015. Subsequent periods of desiccation were a week apart.
The variety of winter rapeseed used for the experiments was a hybrid variety Rohan. The desiccating agent was used Dominator active substance glyphosate. The dose of
4 l / ha + 200 l H2O.
For all samples, both experimental, years yield was determined, the weight of a thousand seeds and oiliness. For desiccated variants were carried out pre-harvest analysis for the determination of solids in pods. Further, all harvested samples taken for laboratory germination test (Determination of germination) ISTA according to the methodology. The results of the experiment sprouting were statistically analyzed using ANOVA analysis of variance. Differences between mean values were evaluated by Tukey test, the computer program SAS at a significance level of p = 0.05.
Effect of desiccation term influences of winter oilseed rape seed quality in terms of weight and thousands of seeds in terms of oil content. Too early desiccation (46 to 39 days before harvest) HTS reduced by 7-17% and the oil content of 2-4% of the overall average. Oiliness of the observed characters minimum interference term desiccation. Desiccation in the optimum date (17 days before harvest) increased oiliness of 1-6%.
Influence term desiccation oilseed rape also greatly influences seed yield.
Too early desiccation (46 to 39 days before harvest) reduced the yield by 11-14%. Undesiccated control in both years achieved the highest yields, increase yield by 5-12%. Desiccation in the optimum date (17 days before harvest) increased the yield of attempts by 5-6%.
The term desiccation of winter rapeseed, also significantly affects the vitality of seeds, where very reduces energy germinating seedlings in the first days. The term desiccation, however, does not affect overall seed germination. Too early desiccation (46 to 39 days before harvest) EK2 decreased by 12-40%, EK3 decreased by 4-24%, 3-4% EK4 and extended MGT of 7-15%. In the first experimental year was the most vital option undesiccated control (EK2 = 50.4% = 91.3% EK3, EK4 = 97.9%). In the second experimental year was the most vital seeds of the optimal term desiccation, (Sixth term, 17 days before harvest) = 68.9% EK2, EK3 = 98.2%, EK4 = 100%. Seed samples of 2014/15 had a higher overall vitality of seeds, than samples from 2013/14, the overall vitality is probably worse given year old and transsilaged seed.
The results of the two-year experiment that term desiccation affects the quality of seeds, the yield of seeds and vitality of seeds. Pre-analysis was determined optimum solids content in siliques desiccated samples to values of 40-50%. Like most technology seems to desiccation in the optimum date (17 days before harvest) and agro technology without desiccated vegetation. As the least appropriate technology seems very early desiccation (46 to 30 days before harvest).
The first scientific hypothesis: Premature desiccation reduces seed yield, oil content and HTS. Yes, the hypothesis was confirmed.
The second scientific hypothesis: Desiccation made in the correct term do not affect the quality of the seeds (oiliness and HTS). Yes, the hypothesis was confirmed.
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Oilseed rape root system development with regard to various ways of soil preparation
Němcová, Michaela ; Bečka, David (advisor) ; Krček, Vítězslav (referee)
This thesis deals with the root system of winter rape with regard to various tillage methods. Resolves, whether for winter rape and its root systém is better standart tillage or minimization. This problem was solved by a one-year research. Sectional characters of each soil treatment such as a root length, diameter of root crown, the length of the longest leaf, number of leaves, the weight of fresh and dried roots were compared in two periods. The results were very good for both technologies, but standart tillage was better in more partial characters. The conclusion of this work is that the standart tillage has a better effect on the development of the root system of winter rape and this experiment should be repeated for longer-term comparisons.
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Comparison of the performance of selected varieties of winter oilseed rape (Brassica napus)
Krouželová, Jana ; Bečka, David (advisor) ; Roman, Roman (referee)
Winter oilseed rape is the most important oilseed plant grown in the Czech Republic. During
recent years, rapeseed sown areas rapidly increased due to its complex usage in industry.
Similarly, the rapeseed oil gains importance which is used in food industry.
The successful cultivation of rapeseed includes the right cultivation technology as well as the
choice of suitable variety which will be the adapted to climatic conditions of location. There
are over 600 varieties to choose from based on Common Catalogue of Varieties of
Agricultural Plant Species from which is about 80 varieties commonly used in practice in
climatic conditions of the Czech Republic. Suitability of these varieties and their yield are
tested based on variety testing conducted by ÚKZUZ. The varieties which proved to be
suitable based on previous testing are recommended for cultivation and placed in
Recommended List of Varieties which helps farmers to orientate in new varieties in the Czech
Republic.The aim of this diploma thesis is a comparison of the performance of selected varieties of
rapeseed which were cultivated in semi-operational conditions in Humburky,
Kralovehradecky region. In this theses yield, oil content, 1000 seed weight were compared.
Two hypotheses were set:
1) Hybrid varieties reach higher height and yield
2) Oil content of liner and hybrids cultivars is equivalent
Further these features were observed: plant height, pod number on the terminal raceme, stalk
number on the terminal raceme, number of primary and secondary branches, height and length
of yield floor and their correlation with yield.
Cultivar Faktor KWS (hybrid) reached the best yield from selected varieties, yielding 5,02 t/
ha (119,2 % average yield). The average yields of liner and hybrids cultivars were almost
equivalent (4,16 t/ha hybrids and 4,10 t/ha liner). The greatest difference between liner and
hybrid varieties was observed in plant height. The hybrids reached 10 cm higher on the
average than liner varieties.
The second hypothesis about the similar oil content of hybrid and liner varietes was
confirmed. Observed varieties reached both 43,3 % of oil content .
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Hereditary and non-hereditary factors affecting the quality of rapeseed oil
Zemanová, Kateřina ; Sedláková, Vladimíra (advisor) ; Bečka, David (referee)
This literature review study quality of rapeseed oil in details, depending on heritable and non-heritable factors. Consumption of rapeseed oil is growing every year and in addition to use in human nutrition is also used in animal feed industry or as fuel for motor vehicles. The rapeseed oil has especially a large representation of oleic acid. Furthermore, it is linoleic acid and linolenic acid and undesirable erucic acid, whose quantity is considerably reduced. It is important to mention glucosinolate content, as antinutritional substances, which is reduced together with erucid acid which is known as "00" rapeseed oil. All these components are described in details in this review. The content of fatty acids in rapeseed oil may be influenced both genetic factors and environmental factors. Selection plays a significant role in breeding. Suitably selecting the correct genotypes along with environmental influences can reach the desired target. An important role is played by the synthesis of fatty acids, where in using a desaturation enzymes of fad series, there is desaturation of stearic acid to oleic acid, linoleic acid and linolenic acid. With QTL method, it can be detected genetic background of quantitative traits. Major genes responsible for the quality of rapeseed oil are located on the chromosome A, namely A1, A3, A5 and A8, which are mentioned in the work.
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Reaction of selected varieties of winter oilseed rape (Brassica napus) on the application of fungicides
Vojík, Jan ; Bečka, David (advisor) ; Michal, Michal (referee)
Oilseed rape i sone of the most important crops in the world. I tis the most important oil crop in Czech Republic. I the last 50 years it had undergone large change in breedeng. Ratio of grown hybrids at present tops the open pollinated lines ( planning for harvest in 2016 saw 88% hybrids and only 12% of lines). There are quite important differences between varieties in tolerance to fungal diseases and not only to them. There are first varieties marketed with gene of pot shatter tolerance and others. The pressure of fungal diseases grows due to growing planting area of the rape.
Trials with oil seed rape were established in the growing season 2014/15 on four varieties and two locations. We tested following hybrids: Arsenal (Limagrain), DK Exstorm (Monsanto), Jumper (Bayer), SY Cassidy (Syngenta). The locations were in the district Jičín farm AGRO Slatiny a.s., and in the district Kolín farm ZD Křečhoř a.s.. On each location were planted two trial variants 1) without fungicide application 2) with the application of fungicides. On the location Slatiny were applied three fungicides (Toprex, Paroli, Propulse), on the location Křečhoř also three fungicides (Toprex, Magnello, Amistar XTRA).
The aim of the bachelor study was to test growth yield and qualitative parameters of the varieties together with observation of fungal diseases and their influence on yield and oil content. We were testing the infestation of following diseases Phoma lingam, Sclerotinia sclerotiorum, Verticilium dahlie Botrytis cinerea.
Hybrid DK Exstorm (195cm) was the tallest variety on both locations followed by hybrid Arsenal (193,5 cm). By number of branches was the best ranked variety hybrid Arsenal, the lowest was SY Cassidy. On fungicide treated variants grew number of pods per m2 by average 6% on both locations. Average yield vas slightly higher in location Křečhoř in both variants, treated (70kg) and untreated (50 kg). On both locations was visible difference between treated and untreated variants. Yield increase was in average 5,4% (200kg/ha). Varieties with best reaction to fungicide treatment were DK Exstorm (Monsanto) and Jumper (Bayer). Fungicide application influenced also crop height, number of branches and pods per m2.
Following conclusions are made in the bachelor study:
- Fungicide application increased yield in average by 5,4% (i.e.200 t/ha) and improwed the health of the crop.
- DK Exstorm and Jumper were varieties with the best reaction on the fungicide treatmentArsenal (4,37 t/ha) was the best yileding variety on both locations followed by hybrid Jumper (4,27 t/ha).
- Arsenal is the recomended variety for both locations Křečhoř and Slatiny
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