EMU DSpace – Eesti Maaülikooli digitaalarhiiv
Digitaalarhiiv EMU DSpace kogub, säilitab ja loob ligipääsu Eesti Maaülikooli liikmeskonna poolt loodud või Eesti Maaülikooli vastutusvaldkondadega seotud teadustöödele toetamaks maaülikooli konkurentsivõimet ja teadmistepõhist ühiskonna arengut. Digitaalarhiivi haldab Eesti Maaülikooli raamatukogu.
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Valige valdkond, et selle kogusid sirvida.
- Institute of Forestry and Engineering (MMI)
- Institute of Agricultural and Environmental Sciences (PKI)
- Institute of Veterinary Medicine and Animal Sciences (VLI)
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Hiljutised sisestused
Ähijärv
(Estonian University of Life Sciences, 2025) Laugaste, Reet (Leg.); Mäemets, Helle (Leg.); Pork, Maia (Leg.); Laugaste, Reet (Det.); Kõvask, Viive (Det.); Pork, Maia (Det.); Eesti Maaülikool. Loodusteaduslikud kogud
Phytoplankton biomass, diversity and abundance in samples collected from Lake Ahijärv during the period 1952-2000.
Evaluation of grain morphometry and gliadin diversity among twenty accessions of the genus Aegilops from the National collection of Bulgaria
(Estonian University of Life Sciences, 2025) Desheva, G.; Petrović, G.; Valchinova, E.; Deshev, M.; Kyosev, B.; Pencheva, A.
The objective of the study was to evaluate the genetic diversity in twenty Aegilops accessions belonging to five plant species with respect to specific grain morphometric parameters and gliadin proteins, employing digital image analysis and A-PAGE electrophoresis. The considerable variation was observed among accessions for grain morphometric traits - area, perimeter, length, width and colour of grain. A total of 96 gliadin polymorphic bands were identified, with the number of bands varying between 13 and 22 per accession. The overall genetic diversity in the samples based on the patterns observed for each of the four gliadin regions showed that the ω, γ and β regions had high genetic variation index (H = 0.950), while α regions (H = 0.938), respectively. The mean genetic diversity estimate was high (H = 0.947). The average genetic similarity between all 20 genotypes ranges from 0.14 to 0.93 with a mean of 0.56, indicating that the studied accessions exhibited considerable genetic variability. The study found that the clustering of Aegilops genotypes was not linked to their geographic origin. Two-dimensional Principal Coordinates Analysis (PCoA) based on the gliadin and morphometric analyses revealed wide genetic dissimilarity between most of the genotypes, explaining 97.16% of the variations, with the model explaining 97.16% of the observed variation. Of this, PCo1 accounted for 93.65% and PCo2 for 3.51%. Genotypes with analogous genomes were grouped in close proximity within the phylogenetic tree, indicating that their evolutionary relationships may have originated from the same parental lineage.
Insight on the impacts of brassinosteroid- and seaweed-based biostimulants on glyphosate-resistant commercial crop growth, yield and soil microorganisms: A scoping review
(Estonian University of Life Sciences, 2025) Tandathu, T.E.; Van Der Watt, E.; Kotzé, E.; Khetsha, Z.P.
Globally, compliance with the chemical regulations on the use of herbicides, particularly glyphosate, remains a challenge. Glyphosate controls various broadleaf, annual, and perennial grasses in the agricultural and non-agricultural sectors. Although glyphosate targets weeds, it can also influence non-target soil microorganisms and high-value plants through earlyseason broadcast, pre-plant application, or indirectly via foliar application by droplets falling to the ground. In plants, glyphosate impacts various physiological and physiochemical processes, inhibits auxin transport, and enhances auxin oxidation in plants. Hence, biostimulants serve as a gateway in alleviating such problems. Biostimulants are agricultural products manufactured from natural materials that contain active compounds, which stimulate growth when applied in minute volumes under different growth conditions. In the past, a major focus was directed toward biostimulants' effects on commercial crops under abiotic stress conditions such as drought, heat, and salinity. However, less emphasis has been placed on the stress caused by herbicide applications. Therefore, this review focuses on future studies to explore brassinosteroid and seaweed-based biostimulants' impact on glyphosate-resistant commercial crop growth and soil microorganisms. Conclusions and recommendations could be reached using the pool of research material, which consists of research articles, reviews, book chapters, theses, research short communications, and industrial short communications from at least the last ten years.
Productive and biochemical responses of Marandu grass under fertilization protocols
(Estonian University of Life Sciences, 2025) Dutra, I.C.; Pires, A.J.V.; Jardim, R.R.; Silva, H.S.; Santos, B.E.F.; Silva, N.V.; Ribeiro, A.S.; Dutra, G.C.; Filho, C.A.A.O.; Publio, P.P.P.; Silva, A.P.G.; Nogueira, M.S.
The aim of this study was to evaluate the effects of liming and chemical fertilization protocols, containing different combinations of nitrogen (N), phosphorus (P) and potassium (K), on the photosynthetic pigments, productive characteristics and carbohydrate concentration of Urochloa brizantha cv. Marandu. Five fertilization protocols were evaluated (PK fertilizer combination; NP fertilizer combination; NK fertilizer combination; NPK fertilizer combination; and without fertilizer - control), associated or not with soil correction via liming, in a completely randomized design, with four replicates. The experimental units consisted of plastic pots with a capacity of 12 liters, which were filled with 10 dm³ of sandy clay loam soil. Seeds of Urochloa brizantha cv. Marandu, with 80% cultural value were used. With the corrected soil, the NP protocol provided greater production of dry mass of residue (PMSRE), root volume, leaf area, leaf area index, total sugar content (AST) and starch in the root, compared to the other protocols. Without liming, the NP protocol provided greater production of aerial part dry mass (PMSPA), root volume, leaf aerial volume, leaf aerial index and AST content in leaves, roots and residue. The NPK protocol, with liming, was 73% higher in chlorophyll a content, 50% in carotenoid content, 90% in PMSPA, 78% in leaf area and 76.2% in leaf area index, compared to the soil without correction. The use of NP fertilization with liming is recommended as it provides positive responses on the photosynthetic pigments, productive characteristics and total sugar content of Marandu grass.
Eesti aasta muld 2025 on Klibumuld
(Eesti Maaülikool, 2025) Kõlli, Raimo; Kauer, Karin
For the Year 2025 Soil of Estonia by the Estonian Soil Science Society (ESSS) was elected Skeletic Regosol (as named by World Reference Base for Soil Resources (WRB)), which is one of subspecies of Coarse Rich Ryhky Soils (by Estonian Soil Classification (ESC)). Although these soils form less than 0,2% from the whole soil cover of Estonia, they merit an attention from the aspect of peculiarities of their forming, which have been taken place on narrow coastal area on the border between sea and mainland. Skeletic Regosols have been formed only on these littoral areas, which is rich mainly in coarse calcareous earth materials as limestone or dolomite containing also small stones (ryhk, pebble, shingle) and large stones. Besides that, these soils are as well rich in different kind of eruptive rocks of the size of small and large stones. The most part of Skeletal Regosols’ coarse fraction was formed under the influence of breaking waves, which were induced by strong sea winds.
The main criteria of Ryhky Soils’ identification after ESC are the content and shape of small stones (Ø 1‒10 cm), water regime of soil cover, and fabric of soil profiles. Ryhky soils are divided into subspecies by the by the shape of small stones. In ryhky soils among others the ryhk fraction is dominated, but in Pebble soils the pebble and in Shingly soils the shingle fractions are dominating.
In the development of Skeletic Regosols or of Shingle soils two development stages is separated. During the first Skeletic Regosols’ abnormal development stage only the primitive shingle rich parent material for these soils have been formed on the border area between mainland and sea. But during this period the soil forming processes are practically absent. During the second development stage of Skeletic Regosols development ie. after with draw of sea water the normal soil forming processes are taken place. As a result of this are formed humus horizons and activated biological cycling on chemical elements and others. In the article the soil forming conditions, coarse earth’s fractions shape and size, development stages of soil profiles, as well soils productivity, humus status, distribution, and agrochemical properties are treated.