Tag Archives: tuber yield

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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21-30 V. Eremeev, A. Lõhmus and J. Jõudu
Effects of thermal shock and pre-sprouting on field performance of potato in Estonia
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Effects of thermal shock and pre-sprouting on field performance of potato in Estonia

V. Eremeev, A. Lõhmus and J. Jõudu

Institute of Agricultural and Environmental Sciences, Estonian University of Life Sciences(EMU), Kreutzwaldi 64, EE51014 Tartu, Estonia;e-mail: Viacheslav.Eremeev@emu.ee

Abstract:

Pre-sprouting (PS), and to a lesser degree, pre-planting thermal shock (TS) had positive effects on tuber yield and other performance indicators. The experiment was carried out during the 2000, 2001 and 2002 growing seasons in the Department of Field Crop Husbandry of the Estonian University of Life Sciences. An untreated control (0) was comparedοοwith TS (2 days at 30 C, then 5 days at 12–15 C in a lighted room just prior to planting) and PSο(35–38 days before planting in a humid (85–90%) and lighted room at 12–15 C). All treatments were applied to three varieties: ‘Agrie Dzeltenie’ (early), ‘Piret’ (medium early) and ‘Ants’ (medium late). In the present study, the TS accelerated the emergence of plants by 2–5 days and PS by 7–12 days. Averaged over 3 years and 3 varieties, maximum leaf area index (LAI, 3.9 units) was reached 74 days after planting (DAP) and on the 50th day after emergence. Maximum LAI was 3.7 at 72 DAP for PS, 3.8 at 73 DAP for TS, and 4.1 at 76 DAP for the control. TS accelerated the beginning of tuber formation by about 5 days compared to the control, but the tuber yield of the control equalled TS from 65 days onward. Tuber formation began even slightly earlier in the PS treatment, and tuber yield exceeded PS throughout the season. All treatments reached maximum yield by 120 DAP.

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39–44 S. K. Kim, J. T. Kim, S. W. Jang, S. C. Lee, B. H. Lee and I. J. Lee
Exogenous effect of gibberellins and jasmonate on tuber enlargement of Dioscorea opposita
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Exogenous effect of gibberellins and jasmonate on tuber enlargement of Dioscorea opposita

S. K. Kim¹, J. T. Kim², S. W. Jang³, S. C. Lee², B. H. Lee¹ and I. J. Lee²

¹Institute for Bioresources Research, Gyeongbuk Provincial Agricultural Technology Administration, Andong 760-891, Korea
²Division of Plant Biosciences, Kyungpook National University, Daegu 702-701, Korea; e-mail: ijlee@knu.ac.kr
³Korea Tobacco and Ginseng Central Research Institute, Daejon 305-805, Korea
The authors (S. K. Kim and J. T. Kim) have equally contributed to this study.

Abstract:

We have examined the single and combinational effect of gibberellins (GA3, GA4+7) and jasmonic acid (JA) on enlargement of Chinese yam tubers in field. In a single treatment, gibberellin promoted the tuber enlargement by one time application, whereas the lowest concentration (100ppm) led to the highest tuber yield rather than accumulative application. The effect of GA4+7 enhancing tuber yield was only recognised at the highest concentration by a single treatment. Tuber weight was decreased at the highest JA concentration, otherwise the lowest concentration of JA (5 ppm) significantly promoted the tuber weight by a single treatment (FS1). The combination of GA 50 ppm plus JA 5ppm enhanced remarkably the tuber weight by a single treatment (FS1). It is suggested that the combined treatment of yam plants with both gibberellic acid and jasmonic acid has promoted tuber yield.

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