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Biology, occurence and regulation possibilities of Viola arvensis Murray in grown plants
MACHÁČEK, Václav
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.
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Methods of regulation the occurrence thaliana violet (Viola arvensis Murray) on arable land
MACHÁČEK, Václav
Due to repetitive planting of certain crops in the crop rotation process, there came to be a loss of certain weed species on the cultivated land, but because of this, a small selected number of species, because of there frequency and abundance, played an import role in the cultivated soil, (or harvest). Currently one of these weed species is the violet thaliana, which occurs in all cultivated crops, especially cereals and oilseeds. The significance of this harmful average weed is increasing significantly. Therefore an attempt was established on the farm, DZV Nova Bystrice. The aim of this experiment is to regulate thaliana violet (Viola arvensis Murray) on arable land.
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The occurrence of weed control methods in stands of grasses spring cereals
SLABÁ, Jiřina
This work focused on the problems of weed plants in spring cereals on plots of agricultural cooperative Čížová. The company is located in South Bohemia, 5 km from Písek. The evaluation of weed infestation was made by numerical method in period from spring 2011 to summer 2011. The issue of weed plants is one of the main negative factors affecting yield and grain quality. Number of weed plants, which at a given location occurred, was regularly observed and evaluated. The most commonly occurring weeds were Viola arvensis, which made up approximately 50 % of all the range of weeds which occurred in the explored land. Other significant weeds were Thlaspi arvense L. and Capsella bursa-pastoris L. We can suppose that Viola arvensis will be a problematic weed. The conclusions can be stated that long-term regulation against the occurrence of perennial weeds must be done carefully and must be based on complete protection which consists of direct and indirect methods of weed control products. Underestimating the occurrence of weeds in crops can cause serious problems.
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