Tag Archives: starch content.

1193-1201 V. Eremeev, B. Tein, P. Lääniste, E. Mäeorg and J. Kuht
The effect of pre-planting thermal treatment of seed tubers on the yield and quality of potato
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The effect of pre-planting thermal treatment of seed tubers on the yield and quality of potato

V. Eremeev*, B. Tein, P. Lääniste, E. Mäeorg and J. Kuht

Estonian University of Life Sciences, Kreutzwaldi 1, EE51014 Tartu, Estonia *Correspondence: vyacheslav.eremeev@emu.ee

Abstract:

Field trials with the potato cultivars ‘Ants’ (medium late) and ‘Laura’ (medium early) were carried out on the experimental fields of the Department of Field Crops and Grassland Husbandry located at Eerika (58°22′ N, 26°40′ E), Estonian University of Life Sciences in 2010 and 2011. The yield of tubers and starch, marketable yield of potato, number of tubers per plant and tuber weight were studied. We used the following treatments: untreated control (To): seed tubers were planted directly from storage house (storage temperature 4°C); thermal shock (TS): seed tubers were kept before planting 5 days in a room with temperature of 30°C and 2 days with temperature of 12°C; pre-sprouting (PS): before planting the seed tubers were kept 26 days in a room with temperature of 15°C and 10 days with temperature of 12°C. The results are presented as the averages of studied years. According to the average results of two experimental years, the pre-planting treatment with thermal shock increased the number of tubers per plant of cultivar ‘Ants’ by 30.6%, compared to control treatment. None of the treatments had any effect on the number of tubers of cultivar ‘Laura’. The thermal treatment increased the average weight of tubers of cultivar ‘Laura’ compared to the control treatment (thermal shock by 14.7%, pre-sprouting by 20.7%), but for cultivar ‘Ants’ the weight of tubers was decreased by 16.7% (thermal shock treatment). The thermal shock treatment increased the tuber yield of cultivar ‘Ants’ by 10.7% and the pre-sprouting increased the total tuber yield of cultivar ‘Laura’ by 9.9%. The thermal shock increased significantly the starch content of cultivar ‘Ants’ and decreased that of cultivar ‘Laura’.

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245-250 V. Eremeev, I. Keres, B. Tein, P. Lääniste, A. Selge and A. Luik
Effect of different production systems on yield and quality of potato
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Effect of different production systems on yield and quality of potato

V. Eremeev, I. Keres, B. Tein, P. Lääniste, A. Selge and A. Luik

Institute of Agricultural and Environmental Science, Estonian University of Life Sciences,Kreutzwaldi St. 1, EE51014 Tartu, Estonia; e-mail: Viacheslav.Eremeev@emu.ee

Abstract:

In the experimental field of the Department of Field Crops and Grassland Husbandry the late maturing potato variety „Ants‟ was grown in the following variants: conversion to organic, N0P0K0, N50P25K95, N100P25K95 and N150P25K95. Pesticides were used in mineral fertilizer variants. In N0P0K0 and mineral fertilizers variants insecticide Fastac 50 was used. The total yield of tubers as well as the proportion of marketable tubers increased significantly with the use of mineral fertilizers (N50P25K95, N100P25K95 and N150P25K95). Tubers from conversion to organic and N0P0K0 variants had significantly higher starch content, compared to the variants where mineral fertilizers were used, but the overall yield of starch remained lower. Increasing the amount of nitrogen fertilizer is positively correlated with the nitrate content in the tubers. The number of tubers infected by potato brown rot and potato soft rot did not differ significantly, but there were fewer tubers infected with black scurf in conversion to the organic variant.

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