Browsing by Area "Agronomija / Agronomy (A001)"
Now showing 1 - 20 of 44
Results Per Page
Sort Options
Publication Agrarinė reforma ir dabartinė žemės ūkio būklė[Agrarian reform and current agricultural situation]conference paperTarptautinė konferencija Ekonomikos reforma Rytų ir Vidurio Europoje. T. 1 : Klaipėda, 1999 m. lapkričio 4-5 d. Klaipėda : [Klaipėdos universiteto leidykla], 1999., p. 5-7Efficiency of agriculture in Lithuania today should be increased not through the land privatization, but through modernization of existing economic units and structural reorganization in accordance with the current requirements of the market.- research article
;Gipiškienė, R. ;Brencienė, VandaButkuvienė, E.Žemės ūkio mokslai. , 1995, Nr. 4., p. 60-641 - research article
; ;Švedas, AlfonsasAntanaitis, ŠarūnasEuropean journal of agronomy. Amsterdam : Elsevier Science, 2003, vol. 20, iss. 1-2., p. 53-62Since 1994 Lithuania is engaged in BEAROP*/the international study of agriculturally derived runoff of nutrients from the countries round the Baltic Sea, proposed by Swedish scientists. One of the demonstration watersheds chosen for this project, river Graisupis watershed, is located in the agricultural plains region of Middle Lithuania. Crop yield and nutrient balance data obtained for V. Liutkevicˇius Demonstration farm at the scale of farm and field are discussed. It was evident after calculations of the flow and balance of N, P and K to observe a discrepancy between actual and estimated values of crop yield. This is a common problem in Lithuania where an unbalanced fertilisation system still exists on many farms, when farmers choose the fertiliser rates, too little attention is paid to the soil analysis and soil nutrient balance. In order to make the fertilisation system more rational, a balanced fertilisation computer model was created at Lithuanian Institute of Agriculture (LIA) and used for that purpose at the Demonstration farm. A drained system of 7.4 ha divided into separate fields, growing a mixture of ley at the Demonstration farm was chosen for the nutrient balance calculation in 1997 and 1998. Calculations of major nutrient flows at the field level have shown that the N balance in this field was positive and P almost in balance, however, the potassium balance was negative. It may be rational to utilise such a local organic fertiliser as urine in this field. The regression equation was developed that relates N surplus with nitrate loss and could be used more widely provided data were available on drainage discharge, total N content in soil, humus content, fertilisation rate. Soil testing at the Demonstration farm should be extended to the areas examined more than 10 years ago. More attention has to be given to the integrated plant protection and soil cultivation measures in order to obtain the planned yields.1Scopus© Citations 19WOS© IF 0.953WOS© AIF 0.938 Publication Change of soil pH in the territory of Lithuania: spatial and temporal analysis[Dirvožemio pH kaita Lietuvoje: analizė erdvėje ir laike]research article; ;Karčauskienė, Danutė ;Tripolskaja, LiudmilaVolungevičius, JonasŽemės ūkio mokslai. , 2007, t. 14, Nr. 3., p. 1-8The paper offers an analysis of the processes of soil acidity neutralization and soil acidification, their interaction and practical consequences. The study object is acid Lithuanian soils.The study was carried out in Lithuania on national and local levels. Material collected in a fifty-year period of agrochemical studies of agricultural land and long-term investigation of soil liming has been used and summarized. The aim of the work was to verify the competence level of the scientific conception and the practical value of scientific recommendations using GIS statistical methods. Systemic spatial and temporal analysis was the main method used in the study. Geoinformation methods were employed to establish the spatial gradation regularities of acid soil areas. The statistical analysis of the upper horizon pH and soil granulometric composition diversity involved the method of statistical grid (2 × 2 km = 4 km2). It was revealed that localization of acid soil areas as natural bodies in its essence is a regular natural phenomenon predetermined by soil genesis. The change of acid soil plots (decrease and increase) takes place in the same areas. Regular liming of acid soils according to scientific recommendations at recommended intensity and cycles, equally as omitting one cycle of liming, exert the greatest changes in the areas of the same acidity, i. e. in very acid and medium acid soils. Soil acidification in the whole territory of Lithuania, if no liming is applied, confirms the necessity of regular uninterrupted liming. The spatial gradation (decrease and increase) of acid soil areas corroborates the adequacy of the scientific conception and of practical scientific recommendations.2 - research article
; Skuodienė, ReginaPolish journal of environmental studies. Olsztyn : HARD Publishing Company, 2012, vol. 21, no. 3., p. 703-711Perennial vegetation is one of the most valuable ecological components when forming healthy living environments, natural and cultural landscape values, and general ecological stability, especially in protected areas. In various countries, increasing attention is being paid to research into biodiversity of meadow phytocenoses. Research in Western Lithuanian meadows was conducted from 2003 to 2006 with the aim to determine how the regime of management and different ecological conditions over several years influences floristic composition, frequency, and stability of meadow sward. Field sampling plots were set up on two semi-natural floodplain meadows in protected areas: in the meadow of the Minija mid-river banks (used for agricultural activities – grazing and cutting), and in the Veiviržas landscape reserve in the flood-meadow land (with no farming activities for the last ten years). The article discusses the relevance of the dominant species on the stability of phytocenoses. Each habitat was estimated for ecological conditions, i.e. soil moisture and vascular plant species indicating soil acidity.1WOS© IF 0.462WOS© AIF 2.678Scopus© SNIP 0.517 - research article
; ;Šlepetienė, Alvyra ;Šimanskaitė, Danutė ;Svirskienė, AldonaButkutė, BronislavaSoil use and managementTo determine the effects of low-input agriculture on soil properties, we compared several forms of arable and land management in a rotation expwriment lasting 8 years on a cambisol in Lithuania. Conventional arable cropping with applications of inorganic fertilizers increased the potassium (K) status of the soil, but resulted in losses of nitrogen (N) from the soil by mineralization and leaching. With ley-arable integrated cropping, a similar fertilizer regime based on farmyard manure (FYM) augmented with inorganic fertilizers increased the phosphorus (P), K, organic matter and N in the soil, as well as increasing N loss by leaching. These two high-input regimes were compared to three systems with less or no input. A reference treatment with no input, which produced small crop yields, maintained its nutrient status and organic matter. An organic regime receiving FYM and green manure lost only P, but maintained its K and N status, while a second organic regime in which the FYM was replaced by composted sewage maintained its fertility. The microbial activity varied somewhat from treatment to tratment, with the largest numbers of almost all groups of micro-organisms in the refrence treatment. All treatments led to decreasses in fulvic acid, and the soil managed conventionally lost humic acid, too. The content of humic acid increased in the tratments were FYM was applied and in the refrence soil, and the fraction bound to calcium increased in the integrated and the first organic treatments. The soil structures under the integrated cropping and second organic regime were the most stable. Of the low-input systems, the second organic regime seemed the most sustainable.1WOS© IF 0.856WOS© AIF 0.983 - conference paper
; ;Tulabienė, G.Repšienė, ReginaSustainable grassland productivity : book of abstracts : 21st general meeting of the European Grassland Federation : Badajoz, Spain, 3-6 April, 2006. Madrid : Sociedad española para el Estudio de los Pastos, 2006. ISBN 8468967149., p. 56The aim of this research was to estimate the structure of agrocenosis and state of perennial grasses in soils with different agrochemical characteristics. Experiments were carried out in the Veziciai Branch of the Lithuanian Institute of Agriculture.1 - conference paper
;Nekrošienė, Rita ;Tulabienė, G.Repšienė, ReginaSustainable grassland productivity : proceedings of the 21st general meeting of the European Grassland Federation : Badajoz, Spain, 3-6 April, 2006Experiments were carried out in the Vezaiciai Branch of the Lithuanian Institute of Agriculture. The aim of this research was to estimate the structure of a grocenosis and state of perennial grasses in soils with different agrochemical characteristics. The soil acidity varied from 3.9 till 6.7, available P2O 5 from 47 till 317 mg kg 31, available K2O from 100 till 360 mg kg 31, and the amount of humus from 17.1 till 23.6 mg kg 31. Such range of soil ecological conditions was crea ted through the application of different amounts of lime, mineral and organic fertilizers. Dry matter (DM) yield of perennial grasses and their density significantly increased as soil nutrient co ntent increased. Damage by diseases to red clover w as 1.4 times larger in more productive, neutral soils than in poor soils, but in these soils red clover w as 1.7 times less damaged by pests.6 - research article
;Tolpežnikaitė, Ernesta ;Bartkevics, Vadims ;Ružauskas, Modestas; ;Viškelis, Pranas ;Urbonavičienė, Dalia ;Zavistanavičiūtė, Paulina ;Zokaitytė, Eglė ;Ruibys, RomasBartkienė, ElenaFoods. Basel : MDPI, 2021, vol. 10, iss. 9, art. no. 2226., p. 1-22The aim of this study was to evaluate the characteristics of macroalgae (Cladophora rupestris, Furcellaria lumbricalis, Ulva intestinalis) and microalgae (Arthrospira platensis (Sp1, Sp2), Chlorella vulgaris) extracts, including micro- and macroelement transition to extract, antioxidant, antimicrobial properties, the concentrations of chlorophyll (-a, -b), and the total carotenoid concentration (TCC). In macroalgae, the highest TCC and chlorophyll content were found in C. rupestris. In microalgae, the TCC was 10.1-times higher in C. vulgaris than in Sp1, Sp2; however, the chlorophyll contents in C. vulgaris samples were lower. A moderate negative correlation was found between the chlorophyll-a and TCC contents (r = −0.4644). In macroalgae extract samples, C. rupestris and F. lumbricalis showed the highest total phenolic compound content (TPCC). DPPH antioxidant activity and TPCC in microalgae was related to the TCC (r = 0.6191, r = 0.6439, respectively). Sp2 extracts inhibited Staphylococcus haemolyticus; C. rupestris, F. lumbricalis, U. intestinalis, and Sp2 extracts inhibited Bacillus subtilis; and U. intestinalis extracts inhibited Streptococcus mutans strains. This study showed that extraction is a suitable technology for toxic metal decontamination in algae; however, some of the desirable microelements are reduced during the extraction, and only the final products, could be applied in food, feed, and others.1 1Scopus© Citations 16WOS© IF 5.561WOS© AIF 5.236Scopus© SNIP 1.428 - research article
;Barčauskaitė, Karolina; ;Mockevičienė, Ieva ;Regina Repšienė ;Gintaras ŠiaudinisSustainabilityBiochar is a promising tool to immobilize heavy metals (HMs) in the soil. Biochar’s effect on HMs immobilization into acidic soil (pH < 5) and the interaction of plants have been investigated. Three types of feedstocks were used for biochar development via pyrolysis at two temperatures and then applied as soil amendments. A vegetative experiment has been carried out with buckwheat and white mustard to determine the effect of biochar as an HMs immobilizing agent in the presence of sewage sludge. The results show promising biochar properties to immobilize heavy metals and reduce their availability for plants. Biochar incorporation increased soil pH and reduced heavy metal forms available to plants. A sequential extraction procedure was applied to investigate five different forms of six heavy metals (Cd, Cr, Cu, Ni, Pb, Zn) and evaluate their distribution after plants’ cultivation. The proportion of the residual fraction (RES) of HMs varied widely and differed from metal to metal and from plant species. RES in the soil after treatment with biochar and buckwheat harvest varied between 68.14 and 96.40% for Zn, 42.39 and 59.48% (Cu), 75.89 and 93.11% (Cr), 81.85 and 92.83% (Ni), and 98.94 and 99.20% (Pb). In comparison, a slightly opposite trend was found in the soil after white mustard cultivation. The proportion of RES was: 0.82–53.44% for Zn, 0.99–52.93% (Cu), 48.87–76.41% (Cr), 10.22–72.63% (Ni), and 98.31–99.32% (Pb). HMs immobilization efficiency in the soil after biochar treatment followed the order Ni > Cr > Pb > Cu > Zn and Ni > Pb > Zn > Cr > Cu after buckwheat and white mustard cultivation, respectively.19WOS© IF 3.9WOS© AIF 5.75Scopus© SNIP 1.198 1 1 - research article
;Čiuberkienė, Dalija ;Knašys, VytautasŽemdirbystė. Akademija, 1995, t. 44., p. 3-161 - research article
; ;Čiuberkienė, DalijaČiuberkis, SteponasEkologija. Vilnius, 1999, Nr. 1., p. 11-171 - research article
;Skuodienė, ReginaAgronomy research. Fostering healthy food systems through organic agriculture - focus on Nordic-Baltic region. Tartu : Estonian agricultural university, 2009, vol. 7, sp. iss. 1., p. 492-497Experiments were carried out in the Vėžaičiai Branch of the Lithuanian Institute of Agriculture (West Lithuania) in 2005–2007. The aim of this research was to assess the impact of using perennial legumes (red and white clover, lucerne) and timothy as green manure in crop rotation on the occurence of net blotch disease (causal agent Drechslera teres (Sacc.) Shoem.) in spring barley. Preceding crops of spring barley were winter triticale and winter rye (perennial grasses were preceding crops of these winter cereals). The yearly occurence of net blotch disease was high: incidence was about 70.00–100.00% severity; at the spring barley booting stage (BBCH 37-39) – from 4.45 to 12.25%, at milk maturity stage (BBCH 73-75) – 43.75–70.95%. The variously-managed perennial grasses in the crop rotation had a significant effect on the occurence of net blotch: the spring barley grown after timothy was 1.1–1.5 times less affected in 2005 and 2007, compared to the spring barley grown after red and white clovers, and about 1.2 times less affected grown after lucerne, compared with spring barley grown after other grasses in 2006.1 Publication The effect of perennials as green manure on cereal productivity and disease incidence[Efecto de las plantas perennes como abono verde en la productividad y en la incidencia de enfermedades de los cereales]research article ;Skuodienė, ReginaSpanish journal of agricultural research. Madrid : Spanish National Institute for Agricultural and Food Research and Technology, 2012, vol. 10, no. 1., p. 44-54Field experiments were conducted at the Vezaiciai Branch of the Lithuanian Research Centre for Agriculture and Forestry during the period 2002-2007. They were designed to ascertain the effects of phytomass of different perennial pre-crops used for green manure on the productivity and on the occurrence of foliar fungal diseases of cereal agrocenoses. Plant residues and phytomass ploughed down as green manures positively affected cereal indices of crop productivity not only for the first but for the second year as well. It influenced the productivity of cereal segments. The largest amount of metabolizable energy was in the yield of cereal sequence under white clover (Trifolium repens L.) —83.23-84.76% GJ ha–1. The potential accumulated by perennials of the second year of development was more efficiently utilised by winter triticale (Triticosecale Wittm.) cv. ‘Tevo’, and that of perennials of the third year of development was more efficiently utilised by spring barley (Hordeum vulgare L.) cv. ‘Ula’. Perennials had a significant effect on the spread of foliar diseases in winter triticale (Triticosecale Wittm.) and spring barley (Hordeum vulgare L.) agrocenoses. The severity of the disease was 1.1-1.3 times higher in the winter triticale (Triticosecale Wittm.) treatments with white clover (Trifolium repens L.) pre-crops. Foliar disease incidence and severity was 1.1-1.2 times higher in the agrocenoses of spring barley (Hordeum vulgare L.) after legumes of the third year of development, especially after lucerne (Medicago sativa L.).1Scopus© Citations 10WOS© IF 0.659WOS© AIF 1.468Scopus© SNIP 0.686 Publication Effect of preceding crops on the winter cereal productivity and diseases incidence[Vpliv predhodnih posevkov na pridelek ter pojavnost bolezni pri ozimnih žitih]research article ;Skuodienė, ReginaActa agriculturae Slovenica. Ljubljana : Biotechnical faculty university if Ljubljana, 2009, vol. 93, no. 2, p. 169-179Experiments were carried out in the Vėžaičiai Branch of the Lithuanian Institute of Agriculture (West Lithuania region) in 2002–2005. The aim of this research was to estimate the ecological significance of perennial legumes used as green manure for the biological properties of triticale and rye and for diseases resistance. Residues of the perennial grasses tested and ploughed-in aftermath contributed different contents of nitrogen to the soil. The highest content of nitrogen was contributed to the soil with red clover residues and aftermath. Residues of white clover and aftermath ploughed in as green manure determined more favourable soil properties. This had a positive effect on the formation of biological parameters of cereals grown after white clover, which made it possible without mineral and organic fertilisers to produce on average 3.88 t ha–1 of triticale grain and 3.82 t ha–1 of rye grain, or by 1.09 and 0.28 t ha–1 more compared with their growing after red clover managed in the same way as white clover. Different growing conditions of winter cereals, i.e. different preceding crops, had a significant effect on the occurrence of scald and septoriosis.3Scopus© Citations 9 - research article
;Tolpežnikaitė, Ernesta ;Starkutė, Vytautė ;Zokaitytė, Eglė ;Ružauskas, Modestas; ;Viškelis, Pranas ;Urbonavičienė, Dalia ;Ruibys, Romas ;Rocha, João M.Bartkienė, ElenaFrontiers in nutrition. Lausanne : Frontiers Media SA, 2022, vol. 9, art. no. 990274., p. 1-19Algal biomass (AB) is prospective source of valuable compounds, however, Baltic Sea macroalgae have some challenges, because of their high microbial and chemical contamination. These problems can be solved, by using appropriate technologies for AG pre-treatment. The aim of this study was to evaluate the influence of two pre-treatments, solid-state fermentation with the Lactiplantibacillus plantarum LUHS135 and ultrasonication, on the antioxidant and antimicrobial characteristics of macro- ( Cladophora rupestris, Cladophora glomerata, Furcellaria lumbricalis, Ulva intestinalis ) and Spirulina ( Arthrospira platensis ) extracts. Also, combinations of extracts and LUHS135 were developed and their characteristics were evaluated. The total phenolic compound content was determined from the calibration curve and expressed in mg of gallic acid equivalents; antioxidant activity was measured by a Trolox equivalent antioxidant capacity assay using the DPPH • (1,1-diphenyl-2-picrylhydrazyl), ABTS •+ 2,2′-azinobis-(3-ethylbenzothiazoline-6-sulfonic acid), FRAP (Ferric Reducing Ability of Plasma) discoloration methods. Antimicrobial activity was measured by using agar well diffusion assay and in a liquid medium. The highest DPPH • and ABTS •+ was shown by C.rupestris and F.lumbricalis extract × LUHS135 combinations, the highest FRAP - by non-pretreated C.rupestris and F.lumbricalis extract × LUHS135 combinations. Ultrasonicated samples inhibited four out of seven tested pathogens. Finally, the tested pre-treatments showed good perspectives and can be recommended for AB valorization.3Scopus© Citations 6WOS© IF 5WOS© AIF 5.5Scopus© SNIP 1.143 Publication Fosforo ir kalio trąšų reikšmė rhizobium galegae ir rytinių ožiarūčių simbiozės efektyvumuiconference paper ;Lapinskas, Edmundas AntanasNaujausi agronomijos tyrimų rezultatai : konferencijos pranešimai. Kaunas : Akademija, 2005, Nr. 37., p. 17-181
- «
- 1 (current)
- 2
- 3
- »