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Articles by Juhan Joudu
Total Records ( 3 ) for Juhan Joudu
  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.
  Peeter Laaniste , Juhan Joudu , Viacheslav Eremeev and Erkki Maeorg
  A five-year investigation on overwintering of winter oilseed rape (Brassica napus L.) cv. Wotan has been carried out in Estonia. Sowing in August was conducted four times at weekly intervals. Seeding rates of 100, 150, and 200 plants m-2, at which respectively 47, 71, and 98 plants overwintered, gave different densities at harvest. A lower plant density (47 plants m-2) produced yields just as high as those with higher density (98 plants m-2). The optimal sowing date was mid August, which gave on average 98 plants m-2 with various plant densities. Those plants also gave higher yield (1748 kg ha-1), compared with the plots sown early or later in August.
  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.
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