CHANGES IN WEED SPECIES COMPOSITION IN NORTHEASTERN CROATIAN ROW CROPS FROM 1977 TO 2015

2017 ◽  
Vol 2 (2017) ◽  
Author(s):  
Edita Štefanić ◽  
Vesna Kovačević ◽  
Darko Dimić ◽  
Ivan Štefanić ◽  
Slavica Antunović
Keyword(s):  
Species Composition ◽  
Weed Species ◽  
Row Crops

scholarly journals Floristic Biodiversity of Weed Communities in Arable Lands of Istria Peninsula (From 2005 to 2017)

2019 ◽  
Vol 38 (2) ◽  
pp. 166-177 ◽  
Author(s):  
Edita Štefanić ◽  
Vesna Kovačević ◽  
Slavica Antunović ◽  
Božica Japundžić-Palenkić ◽  
Dinko Zima ◽  
...  
Keyword(s):  
Species Composition ◽  
Plant Traits ◽  
Row Spacing ◽  
Weed Species ◽  
Row Crops ◽  
The Past ◽  
Full Development ◽  
Weed Communities ◽  
Olive Groves ◽  
The Difference

AbstractThis paper analyses the floristic biodiversity of weed communities in the arable lands of the Istrian peninsula during a twelve year period (2005–2017). A total of 50 fields were surveyed for each sampling time using the seven-degree Braun-Blanquet cover abundance scale in the following agricultural categories: a) permanent crops (vineyards/olive groves), b) alfalfa fields, c) cereals, d) row crops and e) ruderal areas. The taxonomic identification was performed during the full development of vegetation, for cereals in June and July, and for the rest – in August and September. A total of 175 weed species were determined during both study periods with Asteraceae and Poaceae families as the most abundant. Altogether, therophytes were dominant in both surveys, followed by hemycryptophytes and geophytes. Variations in species composition were visible in both study periods (2005 and 2017) as well as in the selected habitat types. Exclusive species were found in addition to those that were common for both surveys. Changes in species composition between 2005 and 2017 referred to the difference in row spacing in earlier period, and ruderal vs. agricultural habitats in the recent survey. The differences in phenological traits between the past and present surveys were greatest for germination season in permanent crops and row crops, flowering start for permanent crops, flowering period for ruderal area and weed height for permanent crops. Significant differences between the past and present survey for other plant traits did not occur.

Flat-cutting loosening in the system of fallow cultivation of chernozem soil and weediness of crops

2017 ◽  
Vol 1 (92) ◽  
pp. 78-84
Author(s):  
G. Koval ◽  
M. Kaliyevskiy ◽  
V. Yeshchenko ◽  
I. Martyniuk ◽  
N. Martyniuk
Keyword(s):  
Species Composition ◽  
Crop Rotation ◽  
Field Experiments ◽  
Early Spring ◽  
Weed Species ◽  
Wild Mustard ◽  
Spring Crop ◽  
White Campion ◽  
Investigation Methods ◽  
Top Soil

The article presents the results of field experiments, where on the basis of podsolized heavy loamy chernozem the influence of replacement of mouldboard ploughing with nonmouldboard cultivation over top soil weediness, weediness at the beginning and end of spring crop vegetation and weed species composition before harve sting were studied. Investigation methods of main fall ploughing under spring crops of five-course rotation: soybeans–rape–wheat–flax–barley at the depths of 15-17, 20-22, 25-27 cm were conducted after post-harvest field tillage. Analysis of data on contamination of the top soil with weed seeds have shown that with the replacement of fall main mouldboard ploughing gwith nonmouldboard cultivation the figure before sowing of all crops withdifferent tillage depthat crop rotation average increased by 131-132%. It caused the increase of actual weed infestation of all crops and at the beginning and end of spring crop vegetationafter different depths of fall nonmouldboard cultivation compared with ploughing at crop rotation average it was 120–132 and 123-138%respectively. Species composition of weeds afterthe replacement of main fall mouldboard ploughing with nonmouldboard cultivation remained mainlyunchanged; although in rape plantings the proportion of white campion and early spring weed sincreased, in wheat plantings– wild mustard andscentless mayweed, insoybean plantings– late spring weeds, in flax plantings– white campion, and in barley plantings– scarlet pimpernel.

scholarly journals Peculiarities of distribution of unseeded species in crops of perennial grasses, depending on the composition of the grass mixture and the mode of use of the grass

2018 ◽  
pp. 120-127
Author(s):  
V. Olifirovich
Keyword(s):  
Species Composition ◽  
Perennial Grasses ◽  
Weed Species ◽  
Grass Stand ◽  
Weed Infestation

The article investigated the species composition and dynamics of changes in the contamination of agrophytocenoses of perennial grasses, depending on the composition of the grass mixture and the mode of use of the grass stand. In the crops of perennial grasses, 34 weed species belonging to 12 botanical kind were found in the first three years of use of the grass stand. In the structure of weed infestation of perennial grasses, the species of the Astra kind of weeds dominated, which were represented by stanktis annual, dandelion, yarrow, field thistle.

scholarly journals Species composition and biodiversity indexes of weeds in paddy rice on two sides of dike system during three crops in an Giang Province, Vietnam

2021 ◽  
Vol 42 (3(SI)) ◽  
pp. 895-902
Author(s):  
M.D. Quan ◽  
◽  
T.T. Hang ◽  
S.T. Nam ◽  
◽  
...  
Keyword(s):  
Species Composition ◽  
Similarity Index ◽  
Paddy Rice ◽  
Occurrence Frequency ◽  
Outer Side ◽  
Weed Species ◽  
Biodiversity Indices ◽  
And Control ◽  
Two Sides ◽  
Scientific Name

Aim: This study was conducted to provide data on weed species composition and biodiversity indexes at different rice crops inside and outside of the dike system in An Giang province, Vietnam. Methodology: Weeds were collected from paddy rice of inner and outer side of dike system from six districts of An Giang province, Vietnam. From each sampling sites, two quadrats with 100 m2 (10 m × 10 m) per quadrat were selected to collect weed after 75-80 days of rice planting. Weeds were collected and identified for their scientific name, and the number of each species was defined, followed by calculation of the occurrence frequency and density of samples. Biodiversity indices viz. Shannon-Weaver (H’), Simpson (1- λ), Margalef (d), and similarity index were also studied among three crops and two sides of dike system. Results: The weed composition in the paddy rice in An Giang was diversity with 137 species. Among them, the most species belonged to families Poaceae, Cyperaceae, and Compositae. The species composition of Crop 3 was the highest one. Species occurrence frequency and weed density of groups C, D, E reached the highest value in Crop 1, followed by Crop 2 and 3. The biodiversity indices of weed species composition in the studied sites were high, reaching the highest value in Crop 3. Interpretation: The results of this study enhance the knowledge of weed species composition and biodiversity indexes to effectively manage and control weeds in rice cultivation.

scholarly journals When herbicides don't really matter: Weed species composition of oil pumpkin (Cucurbita pepo L.) fields in Hungary

2018 ◽  
Vol 110 ◽  
pp. 236-244 ◽  
Author(s):  
Gyula Pinke ◽  
Péter Karácsony ◽  
Bálint Czúcz ◽  
Zoltán Botta-Dukát
Keyword(s):  
Species Composition ◽  
Cucurbita Pepo ◽  
Weed Species

scholarly journals A database of weed plants in the European part of Russia

2020 ◽  
Vol 8 ◽  
Author(s):  
Alyona Tretyakova ◽  
Nickolay Grudanov ◽  
Pavel Kondratkov ◽  
Olga Baranova ◽  
Natalya Luneva ◽  
...  
Keyword(s):  
Species Diversity ◽  
Crop Protection ◽  
European Part ◽  
Perennial Grasses ◽  
Weed Species ◽  
Row Crops ◽  
Factors Affecting ◽  
Weed Plants ◽  
European Part Of Russia ◽  
Winter Crops

Weeds are plants that, although not specially cultivated, grow and often adapt to growing in arable lands. They form an ecological variant of flora, as a historically-formed set of species growing on cultivated soils. For the rational use of the chemical and biological crop protection products and to produce safe and high-quality food, up-to-date data on the floristic diversity of weeds and the patterns of its geographical change are required. The need for a weeds' database arises that allows many specialists to work together independently. However, the great value of any database lies not in its existence, but in the accumulation of data that can be used to analyse the factors affecting the species diversity of weeds. A dataset of weed species diversity and their distribution in the European part of Russia, based on the results of the authors' own research from 1999 to 2019, has been created. The dataset includes 24,284 observations of occurrences of weed plants, which were obtained on the basis of 2,049 relevés of segetal plant communities in seven regions of the European part of Russia. In total, the dataset includes information about 329 species of vascular plants growing in 65 farmlands: cereals, spring and winter crops, industrial crops, row crops and perennial grasses (Tretyakova et al. 2020).

scholarly journals Weed infestation of cereal stubble-fields in the Lublin region

2013 ◽  
Vol 39 (1) ◽  
pp. 143-164
Author(s):  
Franciszek Pawłowski ◽  
Maria Jędruszczak
Keyword(s):  
Species Composition ◽  
Loess Soil ◽  
Weed Species ◽  
Weed Infestation ◽  
Specific Species

Results presented concern the species composition, constancy (S) and indices of coverage (D) of weeds on the cereal stubble-fields on various soils in the Lublin region. The report was based upon 456 phytosociological records collected in 130 stands after harvest in the years 1975-1980. In total 245 weed species were found. They were the scarcest on loose sands - 65 species, and the most abundant on loess soil - 158 species. Each kind of soil was characterized by a specific species composition, various degrees of constancy and indices of coverage of weeds.

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