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Articles by Triin Saue
Total Records ( 3 ) for Triin Saue
  Juri Kadaja , Tiit Plakk , Triin Saue , Edvin Nugis , Peeter Viil and Marje Srekanno
  An instrument for measurement of soil dielectric constant ε r , electrical conductivity EC a, and soil temperature was tested on soils under potato crop to investigate contents of soil volumetric water θ and nutrients for eventual use in a field crop model.

To approximate the dependence of θ on ε r , a logarithmic equation was chosen. Satisfactory results were obtained on stone-free areas, with the mean relative variance between θ-values determined by dielectric constant and converted from a gravimetric method remaining within the limits of measuring error. However, variances were higher for stony soils, with ε r -values at the same θ being considerably higher. To reconcile data from stony and stone-free soils, a formula was composed.

Salinity, calculated by a semi-empirical model based on Hilhorst's theory using measured values of EC a, ε r , and soil temperature, correlated well with contents of K and Mg in the soil. A lower correlation resulted for P, and was practically absent for Ca. Inequality of these regression equations at different measuring sites demonstrates the necessity of considering soil pH when assessing plant nutrients in the soil.
  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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