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Articles by Viacheslav Eremeev
Total Records ( 5 ) for Viacheslav Eremeev
  Viacheslav Eremeev , Juhan Joudu , Peeter Laaniste , Erkki Maeorg , Arvo Makke , Liina Talgre , Enn Lauringson , Henn Raave and Merrit Noormets
  In field trials conducted in 2000-2002, we examined the influence of pre-planting treatments of seed tubers on the formation of leaf area index. The potato varieties used were Agrie Dzeltenie (early), Piret (middle-maturing) and Ants (late). The following treatments were used: untreated control, thermal shock and pre-sprouting. Pre-sprouting treatments of all varieties and thermal shock treatment of the variety Agrie Dzeltenie had a significant effect on the leaf area index. The value and timing of maximum leaf area index were: variety specific, 4.0 units of the early variety Agrie Dzeltenie, 3.7 units of the middle-maturing variety Piret and 3.9 units of the late variety Ants. The weight of the haulms of the plants developed from physiologically older seed tubers formed faster and remained smaller. Pre-planting treatment of seed tubers provided quicker field emergence. The slower the potato plants developed the haulms, the greater the maximum weight achieved. Pre-planting treatments influence the leaf area index. The importance of this influence lies in potato varieties with different maturity times since increases in quality and yield depend on the size of the photosynthetic area.
  Liina Talgre , Enn Lauringson , Hugo Roostalu , Alar Astover , Viacheslav Eremeev and Are Selge
  A field experiment was conducted in 2004-2006 to investigate the effect of green manure treatments on the yield of oats and spring barley. In the experiment, different green manure crops with undersowing and pure sowing were compared for amounts of N, C, and organic matter driven into soil and their effect on cereal yield. The spring barley field had a total of 41.7-62.4 kg N ha-1 and 1.75-2.81 Mg C ha-1 added to the soil with straw, weed, and roots, depending on the level of fertilisation; with red clover, and both common and hybrid lucerne undersowing, with barley straw and roots, the values were 3.45-3.96 Mg C ha-1 and 139.9-184.9 kg N ha-1. Pure sowings of these three leguminous green manure crops had total applications of 3.37-4.14 Mg C ha-1 and 219.7-236.8 kg N ha-1. The mixed and pure sowing of bird′s-foot trefoil provided considerably less nitrogen and carbon to the soil with the biomass than with the other leguminous crops. Application of biomass with a high C/N ratio reduced the yield of the succeeding spring cereals. Of the green manures, the most effective were red clover and both common and hybrid lucerne, either as undersowing or as pure sowing. Undersowings with barley significantly increased the N supply for the succeeding crop without yield loss of the main crop compared with the unfertilised variant. Compared with ploughing-in of green manure in autumn, spring ploughing gave a 0.2-0.57 Mg ha-1 larger grain yield.
  Viacheslav Eremeev , Alfons Lohmus , Peeter Laaniste , Juhan Joudu , Liina Talgre and Enn Lauringson
  For earlier potato yield formation we used pre-sprouting and thermal treatment which both add to the physiological age of potato. At the same time, pre-sprouting is a very time- and energy-consuming procedure. We investigated if thermal treatment could replace pre-sprouting and how it affects the growth and development of potato haulms and tubers. For that purpose an experiment was conducted in 2000-2002 to examine the opportunities for growing potatoes by using different methods of pre-planting treatment of seed tubers.
Early, middle and late maturing potato varieties (two Estonian varieties and one Latvian) were used, each being subdivided into three variant categories: untreated, thermal shock and pre-sprouting.
The experiment indicated that one or the other of thermal shock or pre-sprouting shortened the time to emergence by up to 10 days. With pre-sprouting, the formation of tubers started as soon as 45 days after planting and with thermal shock 50 days after planting, i.e., 5-10 days earlier than in the untreated variant.
Thermal shock of seed tubers had the greatest effect on the number of tubers per plant, while pre-sprouting increased the average weight of tubers.
Both pre-sprouting and thermal shock had a strong effect on the weight of the haulms in varieties with a longer growth period.
  Marje Sarekanno , Juri Kadaja , Katrin Kotkas , Viive Rosenberg , Virge Vasar , Triin Saue and Viacheslav Eremeev
  A technique developed at the Department of Plant Biotechnology EVIKA of the Estonian Research Institute of Agriculture to multiply disease-free potato seed tubers involves growing plantlets in vitro in plastic rolls on peat before transplanting them to the field. The effects of the method of multiplication, variety, and experimental year on tuber yield were investigated. Plants cultured in vitro from micro-plants were compared with plants grown from tip- and stem-cuttings, and truncated plants that had served as a source of the mentioned cuttings. Two late-maturing potato varieties, Ants and Vigri, were used. The multiplication method, variety, and environmental factors significantly affected the number of tubers per plant and average weight of a tuber. Whereas plants cultured in vitro consistently produced substantially greater numbers of tubers and they were the right size to serve as seed tubers, plants from tip- and stem-cuttings produced fewer tubers and the size of full-grown tubers was too large for seed-production. Truncated plants fell between the two. For seed-potato growing perspectives, the plants from in vitro and truncated plants are the most applicable. Growing tip-and stem-cuttings, the shorter growth period to achieve suitable-sized seed tubers should be adapted. Differences between multiplication methods were smaller in the case of Vigri, which tends to produce more shoots. It is concluded that multiplication methods that result in more shoots per plant also lead to more and smaller tubers. Environmental conditions affected both the number and weight: the dry year, when conditions for growth were adverse, reduced the effect of other factors on the number of tubers whereas near-optimal growth conditions intensified the effect of those factors on tuber weight.
  Marje Sarekanno , Juri Kadaja , Katrin Kotkas , Viive Rosenberg , Virge Vasar , Triin Saue and Viacheslav Eremeev
  A plant-multiplication technique developed at the Department of Plant Biotechnology EVIKA of the Estonian Research Institute of Agriculture involves multiplying plantlets in plastic rolls on peat before transplanting them onto the field, where the first generation of seed tubers will be grown. Four possible multiplication methods of potato meristem plants were compared from the aspect of obtaining optimal-sized, disease-free seed tubers. The plants grown from tip- and stem-cuttings and truncated plants were considered in relation to the plants multiplied by the in vitro micro-plant cultivation in plastic rolls. The main objective of this paper is to analyse how the tubers' mass per plant and their size distribution depend on the multiplication method, experimental year, and potato variety. Two local late-maturing potato varieties, Ants and Vigri, were used in the study, carried out in 2005-2007. A significant influence of multiplication method and experimental year on tuber weight and tuber-size distribution throughout the growing period was found. While plants multiplied by in vitro micro-cuttings produced substantially lower tuber mass per plant, also their tuber-size distribution was considerably inclined towards smaller dimensions - more tubers with <30 mm diameter (φ) and fewer tubers with >60 mm diameter were formed. Compared with plants multiplied by the in vitro micro-plants method, significantly fewer tubers within the most proper seed-tuber size range (φ 30-60 mm) were received for plants multiplied from tip- and stem-cuttings, while the plants grown from truncated seedlings provided about the same yield as micro-plants in this size interval. All stated differences were magnified by unfavourable growing years, whereas in favourable conditions the differences were almost non-existent. The influence of potato variety on tuber mass and their size distribution was not proved. All described EVIKA multiplication methods achieve quite similar tuber yields and seed-production potential, comparable to those obtained by in vitro methods.
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