National Repository of Grey Literature 22 records found  1 - 10nextend  jump to record: Search took 0.01 seconds. 
New knowledge in the field of mechanism of action and use of auxin herbicides
Skůpa, Petr ; Petrášek, Jan ; Bárnet, M.
The methodology summarizes all the latest findings in the field of mechanism of auxin effects in the plant, which give users a new perspective on their use in agricultural practice.
Regulation of Weeds in Grown Hybrids of Maize
NAHODIL, Antonín
The degree work describes the biology and morphology of the weed plants, which are found in maize vegetation most frequently, as well as their spreading and possible regulation. Based on the findings acquired, the methods of chemical and mechanical regulation are described. The degree work describes briefly both the plant of maize itself and the process of its growing. The attempt took place on the school farm of the Agricultural School in Tábor; a small plot attempt was carried out at the same place. The frequency of the occurrence of weed species on the selected small plots was evaluated in the hybrids of maize (Zea mays). The degree work contains data on the extent of the occurrence of weeds on individual plots, on which the individual hybrids of maize were compared with one another. It also includes an economic evaluation and possible measures to eliminate the spreading of weeds.
Biology, presence and methods of weeds regulation on a land planted with permanent grasses.
This thesis is aimed at biology, presence and methods of weeds regulation on a land planted with permanent grasses. Lately, ruderal weed species have been spreading uncontrollably throughout the lawns. It is very difficult to control their occurrence and also very economically challenging. Therefore, the farms should focus more on the possibilities of preventing excessive weed infestation and they should also define and apply the cheapest and the most favorable precautions. On the grassland, which belongs to the ZD Třebelovice, were observed the most abundant weed species. The weeds which occurred the most were: Taraxacum Officinale, Rumex Obtusifolius L, Ranunculus Repens L., Geranium Pratense L., and Urtica dioica L. The influence of the individual hay cuts on the occurrence of the chosen weed species was monitored. The influence of various herbicides was also the matter of observance. The componential task was to appraise the achieved effect after applying chosen herbicides on the weed species.
Control of weeds in cultivated root crops
Damages, which weeds caused annually are difficult to quantify and its negative influence manifests annually in all crops and all fields.Chemical weed control is presently considered an important method for controlling weeds. The essence of chemical pest weeds consists in the use of herbicides to reduce weed species population under the economic threshold of harmfulness. In an effort to control weed populations using three methods: mechanical, chemical and biological. In the thesis was mapped weeds in potatoes on private land in Plasná, district of Jindřichův Hradec in region of South Bohemia. In the practical part of this thesis, I conducted an experiment that was aimed at monitoring the effects of selected herbicides in crops of potatoes. The aim of the experiment was to verify the effects of herbicides on the population most frequently occurring weeds in the root crops. The results showed that the herbicide is more effective for preemergence weed monitored. Assessment of weed infestation was carried out numerical method (ANOVA, Tukey = 0,05) in the ARM 8 (GyllingDataManage ment, Inc.) Spring 2013 - Fall 2013.
Biology, occurence and regulation possibilities of Viola arvensis Murray in grown plants
This thesis concerns on biology, occurrence and especially, herbicide regulation of Viola arvensis Murray on arable land. On the land of the farm DZV NOVA Bystřice a small-plot experiment focused on monitoring and regulation of Viola arvensis was carried out. This experiment was carried out from September 2012 to January 2014 on three crops (winter wheat, winter barley and winter rape) in three locations. In the theoretical part we describe the biology and occurrence of this frequent weed. The aim of the thesis was to evaluate the abundance of Viola arvensis and other weed species and verify the effect of different herbicides on Viola arvensis and other weeds. The effectiveness of the tested herbicide combinations was statistically significant for Viola arvensis and also for the other weeds (P 0, 05). The exceptions were Veronica persica, Geranium pussilum and Hordeum vulgare, where the effectiveness of these agents was not proved (P > 0, 05). The results summarize the numbers of weed species and effectiveness of applied herbicides. Viola arvensis was the most frequent weed species found on the examined sites. The effectiveness of herbicide agents used against this weed was very high. The highest was by preparations Maraton + Glean 75 WG, Maraton + Logran 20 WG, Cougar Forte + Logran 20 WG a Sumimax + Glean 75 WG (100 %). Lower was by preparations Butisan 400 SC + Command 36 SC (80 %) a Butisan Star + Garland Forte (75 %). In the winter barley and winter wheat, the applied herbicides were 100% effective, only in the winter rape the effectiveness was lower (75 - 80%). I can confirm the initial hypothesis about the effectiveness of the different herbicides on field pansy because their effectiveness differed.
Biology, occurrence and regulation Apera spica-venti tufted crops grown.
ORNA, Vítězslav
Over the last decades the amount of weeds in our fields have noticeably decreased. The easily annihilated and susceptible species were almost eradicated by means of herbicides and agrotechnical operations. Their place was taken by more resistant species, which are a huge problem for the farmers. For this purpose I decided to make an experiment under the working circumstances. I observed the occurrence of the weeds in certain localities. Especially I concentrated on the silky bent grass (Apera spica-venti), on its occurrence, regulation, extension and susceptibility or resistance to certain herbicides. The effect of the tested herbicide combinations was statistically significant for silky bent grass as well as for the other weeds (P 0.05). The coach grass was the only exception, where the effect of these preparations was not proved, as well as Vicia cracca, Lamium purpurem, Galium aparine, Geranium pusillum (P > 0.05). However the coach grass appeared among these inconclusively responsive weeds more frequently. (P >0.05). As the results of experiment showed, the most effective combinations for elimination of the silky bent grass (Apera spica-venti) were Sumimax + Glean, Cugar Forte + Glean + Dural a Cugar Forte + Logran. All these combinations were proved to be 100% effective against the silky bent grass (Apera spica-venti). The other combinations were not 100% effective. These comprised Rapsan + Command+ Grounded with 89 % effectivity, Sumimax + Logran 91 % effectivity a Butisan+ Clomate+ Grounded 67 % effectivity. The results show that the silky bent grass (Apera spica-venti) is more susceptible to some herbicide combinations and in the fields it can be successfully reduced. On the contrary the silky bent grass (Apera spica-venti) is resilient to some other agents. From this point of view the right choice of the herbicides is crucial in next year.
The control of weeds in maize stand (\kur{Zea mays L.})
VANĚK, Robert
Some of weeds have disappeared owing to the plant production specialization; some of them have become more resistive. Those weeds have taken significant role due to its danger and frequency of presence. The thesis is mainly focused on description of biology and morphology of weeds, possibilities of weeds spread and weed control. Methods of mechanical and chemical regulation are described based on these facts. The experiments, which were carried on maize, determined the effect of selected herbicide and its active substance on weed control. Following precautions, which were suggested, have led to successful suppression of specific significant weeds.
Ways to control Silky bent grass in cereals stands
ORNA, Vítězslav
Currently, weeds are the most problematic group of harmful agents in the plant protection. A major problem are the weed species resistant to herbicides, minimize soil preparation and increasing the proportion of winter cereals in the crop rotation. Among the species represented with large increase in our fields belongs silki-bent grass (Apera spica-venti L.). For this reason, was found an herbicidic attepmt in cereals and research the number of weeds and effectiveness of herbicides against the weeds on the individual checkpoints .
Biology, occurrence and control Cockspur Grass(\kur{Echinochloa crus-galli} (L.) Beauv.)on arable land
This work is focused on the occurrence of Cockspur Grass (lat. Echinochloa crus-galli) on arable land and ways and means of its regulation. Damages which are annually caused by weeds are very difficult to quantify and their negative impact is reflected every year in all crops and all fields. Cocksour Grass belongs among the most dangerous weeds, especially in wide-row stands. Furthermore, I focused on the issue of late weed, seed dormancy and resistance of populations. A related question is possible solution to the protection of stands against weeds using both preventive and direct methods of control plants. An experiment was made to check influence of herbicides on the population of Cockspur and other weed species which occur in this root-crops. The result showed which kind of herbicide is more effective with pre-emergence application to Cockspur Grass and other monitored weeds.
Biology and control of Redroot pigweed (Amaranthus retroflexus L.) on arable land
This work is focused on pigweed species-related issues, particularly those of redroot pigweed (Amaranthus retroflexus L.), including biology, occurrence, harmfulness, spreading and possibilities to regulate the plant, which, nowadays, ranks among very dangerous and constantly spreading weed species. I therefore monitored the frequency of occurrence of redroot pigweed and other weed species grown on experimental plots during the maize vegetation season, and the effectiveness of weed regulation efforts through three registered herbicides, namely Adengo, Milagro and Callisto 480 SC. All three herbicides were appreciably very effective on redroot pigweed and delivered results proved the necessity of applying herbicides to control weed populations in today?s agricultural practices. In this respect, it can indeed be noted that a long-term regulation must be based on principles of good agro-technology practices and combine effectively sowing procedures, chemical protection and other both direct and preventive procedures.

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