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Wplyw nawozenia potasowego na jakosc bulw ziemniaka z uprawy ekologicznej

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Danilcenko H., Venskutoniene E., Bartaseviciene B., Pranaitiene R.
Zeszyty Problemowe Postępów Nauk Rolniczych
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2006
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tom 511
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nr 1
209-215
Estimated the influence of various potassium fertilizers for potatoes tubers which where grown organically in 2002-2004. According to the research results the quality of potato tubers depended on the kind of potassium fertilizers. Most positive effects on the contents of dry matter and starch as well as on technological property - darkening, were observed in potato tubers fertlized with potassium sulphate N₀P₀K₉₀ and potassium magnesia N₀P₀K₁₅₀.
2
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The ecological aspects in the potato tuber storage

100%
Jariene E., Pranaitiene R., Viskelis P., Golubowska G.
Zeszyty Problemowe Postępów Nauk Rolniczych
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2006
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tom 511
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nr 2
Over 2003 to 2005 in Lithuanian Agricultural University the laboratory research was carried out concerning the effect of caraway seed and dill seeds essentials oils on the storage of five potato cultivars. Research results showed that after 7 months of storage the smallest natural mass losses occured in potatoes of Goda cultivars, which were treated by plant inhibitors. The smallest mass of sprouts was observed in Nida cultivars treated by plant inhibitors.
3

Effect of mechanical injury on the variations of the quality of five cultivars of potato tubers

100%
Danilcenko H., Jariene E., Pranaitiene R.
Zeszyty Problemowe Postępów Nauk Rolniczych
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2010
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tom 557
The studies were conducted in 2005-2007 in Lithuanian University of Agriculture. The purpose of research was to establish the influence of mechanical injury of potato tubers on their quality. The experiment showed that during storage some chemical-physiological features had been changing constantly. The potatoes for research were grown under usual conditions in Vokė Branch Station (Lithuanian Institute of Agriculture) in Vilnius region in 2005-2007. For seven months (from September to April) potato tubers were stored in KX-Ю freezing chambers: 5-6°C, relative humidity - 90-95%. The studied samples of potatoes were stored in polythene bags of 120 µ thickness. General and natural weight losses were determined in 2 repetitions, two times: before storing and after seven months of storage. The analyses were carried out using standard methods: dry matter, saccharide content (reducing sugar and saccharose) and store losses of the mass. A suitable laboratorial bruising equipment was used (Fig. 1). The studied potato tubers were bruising from: 10 cm, 15 cm, 20 cm and 100 cm high. Research results showed that after 7 months of storage, all mechanically injured tubers demonstrated the lower content of dry matter as compared to the control sample. Tubers bruised from 100 cm height featured the highest losses of dry matter, whereas the lowest losses were characteristic for tubers bruised from 15 cm height. Tubers injured mechanically from 100 cm height and stored for 7 months demonstrated the greatest mass losses, whereas tubers bruised from 15 cm height featured the lowest mass losses.
4

The effect of inhibitors on the amino acid content in the stored potato tubers

100%
Danilchenko H., Pranaitiene R., Taraseviciene Z., Venskutoniene E.
Zeszyty Problemowe Postępów Nauk Rolniczych
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2008
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tom 530
The research was carried out in 2002-2006 at the Crop-Growing Product Storage and Processing Laboratory, Department of Horticulture, Lithuanian University of Agriculture Animal Husbandry Institute of Lithuanian Veterinary Academy. 15 amino acids were determined in the studied samples of potato tubers of 5 cultivars including 9 essential amino acids. Essential amino acids make up 38-45% of all the amino acids. In potato tubers, the dominating amino acids were leucine and valine, the lowest amount was of methionine and histidine. Dominating alterable amino acids were glutamic and aspartic acids. The latter were one of the most mobile during the storage period. During the whole period of storage, the lowest changes were observed in the following: lysine in cv. Goda tubers, histidine in cv. Nida tubers, methionine, histidine and isoleucine in potato tubers of the cv. Vaiva. Alterable amino acids, i.e. glycine, alanine and tyrosine, during the whole period of storage changed the least in the potato tubers of all cultivars. The decrease in the protein content during the storage period causes the increase in the tyrosine content. Tyrosine is not desirable in potato tubers due to the fact that it negatively affects the color of raw potato tubers. Under the increasing amount of tyrosine, potatoes darken faster. According to the data of our research, the amount of tyrosine in potato tubers of all cultivars was not significant. After carrying out the correlation analysis between the darkening of raw potato tubers and the amount of tyrosine, a weak correlation was determined (r = -0.4).
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