Reaction of varying in the length of a vegetation period to differentiated water-fertilization conditions
Zenobiusz Dmowski
sekretariat.kkios@upwr.edu.plKatedra Rolniczych Podstaw Kształtowania Środowiska, Akademia Rolnicza we Wrocławiu (Poland)
Lech Nowak
Katedra Rolniczych Podstaw Kształtowania Środowiska, Akademia Rolnicza we Wrocławiu (Poland)
Kazimierz Chmura
Katedra Rolniczych Podstaw Kształtowania Środowiska, Akademia Rolnicza we Wrocławiu (Poland)
Abstract
The study was based on the results of investigations performed at the Research and Didactic Crop Irrigation Station in Samotwor near Wrocław, and on meteorological data from the neighbouring station Wrocław-Strachowice from 1974–2001. The soil of the experimental plot was light loam belonging to good rye complex (5). The experiments were performed using the method of random sub-blocks as a related system. The variables were: variety, level of nitrogen fertilisation and sprinkling irrigation. In total, 49 varieties were investigated (15 — early, 12 — medium early, 13 — medium late and 9 — late). Based on regression analysis of yielding as dependent on atmospheric precipitation in the period May-July, it was found that the highest yields of medium-late varieties can be expected in the years with 240–270 mm precipitation. With rainfall above that amount the yield of most of the varieties studied was decisively lower. Moreover, increased precipitation from May to July significantly lowered the content of starch in potato tubers. Irrigation of potatoes caused a significant increase in the yield of all the groups studied as follows: early variety by 14%, medium early by 11%, medium late by 23%, and late by 11%. Irrigation had no significant effect on starch content of the tubers in all the groups. The highest tuber yields of early varieties were obtained when the plants were fertilized with nitrogen at 80–120 kg/ha, and of the remaining varieties at 120–160 kg/ha. When the level of nitrogen fertilization increased, the starch content of tubers diminished in all the varieties.
Keywords:
cultivars, irrigation, nitrogen fertilization, potato, starch, yieldReferences
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Authors
Zenobiusz Dmowskisekretariat.kkios@upwr.edu.pl
Katedra Rolniczych Podstaw Kształtowania Środowiska, Akademia Rolnicza we Wrocławiu Poland
Authors
Lech NowakKatedra Rolniczych Podstaw Kształtowania Środowiska, Akademia Rolnicza we Wrocławiu Poland
Authors
Kazimierz ChmuraKatedra Rolniczych Podstaw Kształtowania Środowiska, Akademia Rolnicza we Wrocławiu Poland
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Copyright (c) 2004 Zenobiusz Dmowski, Lech Nowak, Kazimierz Chmura
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