LEAVES AREA AND PHOTOSYNTHETIC PIGMENTS OF DOMINANT PLANTS OF RURAL PASTURES IN THE STEPPE BELT OF MOUNT ARAGATS IN ARMENIA

В статье обобщены результаты исследований ассимиляционной поверхности и содержания фотосинтетических пигментов в листьях растений основных луговых групп юго-западного склона горы Арагац (1300-1900 м н.у.м.). Данные территории находятся под сильным воздействием экологических и антропогенных факторов, отличаются низкой продуктивностью, следовательно, нуждаются в коренном улучшении. В рамках настоящей работы была поставлена задача создать базу экспериментальных данных по биологическим параметрам, ответственным за формирование урожая. Объектами исследований были следующие виды злаковых – Коленница (Aegilops cylindrica), Костер (Bromus tectorium), Мятлик (Poa bulbosa), Пырей (Agropyron repens), Ячмень (Hordeum bulbosum), бобовых – Эспарцет (Onobrychis radiata), Клевер (Trifolium pratense), Вика (Vicia variabilis), Люцерна (Medicago sativa) и разнотравных растений – Молочай (Euphorbia virgata), Пижма (Tanacetum vulgare), Скабиоза (Scabiosa bipinnata), Котовник (Nepeta Мussini), Тысячелистник (Achillea millefolium), Полынь (Artemisia absinthium). Площадь листьев определялась весовым методом, экстракция пигментов проводилась с помощью диметилсульфоксида, а измерение их содержания – на спектрофотометре СФ-16. Выявлен широкий диапазон колебаний площади листьев у индивидуальных видов (0,9-11,5), тогда как разница между луговыми группами была незначительной (4,0-5,9 дм2/растение). Сумма пигментов в листьях разнотравных растений на 22 % была меньше, чем у злаковых и бобовых, а соотношение хлорофиллов А и Б колебалось в пределах 1,8-3,5. Таким образом, на исследуемых кормовых угодьях максимальные размеры площади листьев обнаружены у многолетних злаковых, сумма пигментов и хлорофилл А – бобовых, а хлорофилл Б – разнотравных растений. The article summarizes the scientific results on the assimilation surface and the content of photosynthetic pigments in the leaves of plants in the main meadow groups of the southwestern slope of Mount Aragats (1300-1900 m above sea level). Under the strong influence of environmental and anthropogenic factors these territories are characterized by low productivity, therefore, they need efficient improvement. Within the framework of this scientific article, the task was set to create a database of experimental data on biological parameters responsible for the yield farming. The objects of the current research were the following types of cereals – Goatgrass (Aegilops cylindrica), Cheat grass (Bromus tectorium), Bluegrass (Poa bulbosa), Wheatgrass (Agropyron repens), Barley (Hordeum bulbosum), legumes – Sainfoins (Onobrychis radiata), Clover (Trifolium pratenium), Cow vetch (Vicia variabilis), Alfalfa (Medicago sativa), and herbs – Leafy spurge (Euphorbia virgata), Tansy (Tanacetum vulgare), Scabiosa (Scabiosa bipinnata), Catnip (Nepeta Mussini), Yarrow (Achillea milleteminium), Wormwood (Artemisia absinthium). The leaf area was determined by the gravimetric method, pigment extraction was carried out using dimethyl sulfoxide, and their content was measured on an SF-16 spectrophotometer. A wide range of fluctuations in the leaf area in individual species was revealed (0.9-11.5), while the difference between meadow groups was insignificant (4.0-5.9 dm2/plant). The amount of pigments in the leaves of herbs was 22% less than that in cereals and legumes, and the ratio of chlorophylls A and B varied within 1.8-3.5. Thus, on the studied foraging grounds, the maximum leaf area was found in perennial cereals, the sum of pigments and chlorophyll A – in legumes, and chlorophyll B – in herbs. leaves area, photosynthetic pigments, wild plants, natural pastures, steppe belt

The herbicide effect for controlling the weeds in wheat field

Of all reported distributions of weeds of 19 species belonging to 15 genera of 10 families in the wheat planted fields Tsagaannuur soum of Selenge aimag, annuals account for 57.9%, biennials for 10.5% and perennials for 31.5%. The use of herbicide Trimexa, Cliomex 300, Cliodmex plus and Trimexa + Cliodimex plus express for controlling both grassy and dicotyledonous weeds has Agropyron repens L, Panicium miliaceum L, Eragrostis minor Host, Amaranthus retroflexus L, Artemisia sieversiana Willd, Cannabis ruderalis Janisch, Chenopodium album L, Chenopodium aristatum L, Chenopodium acuminatum Willd, Convolvulus arvensis L, Convolvulus gortschakovii Schrenk, Erodium stephanianum Willd, Polygonum convolvulus L, Geranium siviricum L, Salsola collina (Pall), Salsola australis R.Br, Noneo pulla L, Malva mohileviensis Downer, Vicia cracca L. 84.4-90.9% technical effectiveness.

Heavy Metals (Cr, Cd, Cu, Pb and Zn) Uptake by Cirsium arvense and Agropyron repens

The purpose of this study was to monitor the heavy metal soil contamination and also to accomplish a comparative study on Cirsium arvense and Agropyron repens heavy metals uptake. The samples were collected from seven different sites situated at various distances from the polluted area Tarnaveni, Romania. Near the chemical wastes spontaneous vegetation is predominant. In this vegetation formed on fallow land, Agropyron repens (monocotyledonate perennial weed) and Cirsium arvense (dicotyledonate perennial weed) are dominant species. The metal (Cr, Cd, Cu, Pb and Zn) concentrations were determined by flame atomic absorption spectrophotometry. The data were statistically analyzed using Main Component Analysis and Generalized Linear Model. Based on our research, we can conclude that Cirsium arvense is accumulating more chromium compared to Agropyron repens and is recommended to be used as an indicator for chromium contamination. The present study highlights that animals consuming spontaneous vegetation grown in this area ingest significant amounts of chromium and zinc.

Badania możliwości stosowania norflurazonu do zwalczania Agropyron repens L. Część I. Wpływ norflurazonu na zawartość chlorofilu i karotenu w perzu rozgłogowym [Effect of Norflurazon in weed control. P. I. Influence of Narflurazon on pigment's content in Agropyrcn repens L.]

The influence of Narflurazon on chlorophyll content, development of <i>Agropron repens</i> L. plants grown under high and low light intensites was studied. Under high light intensity (10 000 lx) both chlorophyll and carotenoides production was markedly reduced, 0.5 ppm and more of Norflurazon bleac ed the platns almost competely. Higher doses of Norflurazon (0.025 ppm and more) significantly inhibited growth and respiration of <i>Agropyron repens</i>.

Rare and new for Poland species of Uredinales and Ustilaginales collected in the area of the Pieniny Mountains (Western Carpathians)

The author has found <i>Puccinia asteris-olpini</i> on <i>Aster alpinus</i> - a species new to Poland, and five species of fungi on host new to Poland: <i>Anthracoidea caricis</i> on <i>Carer pallescens, Entyloma doctylidis</i> on <i>Dactylis glomerata, Schizonella melanogramma</i> on <i>Carex ornithopoda, Urocystis poae</i> on <i>Poa trivialis, Ustilago striiformis</i> on <i>Agropyron repens</i> and <i>Sesleria coerulea</i>. Other species are rare in Polish mycoflora and known only from isolated stands.