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Rymuza K.,Siedlce University Of Natural Sciences And Humanities | Radzka E.,Siedlce University Of Natural Sciences And Humanities | Lenartowicz T.,The Research Center for Cultivar Testing in Slupia Wielka
Journal of Ecological Engineering | Year: 2015

The basis of this elaboration constituted data concerning mean starch content in nine medium-early cultivars of potato grown in six experimental stations belonging to COBORU (Research Centre for Cultivar Testing) in years 2010-2013. Using stepwise regression analysis the influence of thermal and precipitation conditions on starch content in potato cultivars was examined. Such analysis was performed for locations, years and particular cultivars. The analysis showed that starch content in tubers of medium-early potato cultivars depends more on precipitation than on thermal conditions. The relationship between starch content in tubers and precipitation and thermal conditions varied in different stations. In four stations (Karzniczka, Sulejów, Uhnin, Wegrzce) it depended on precipitation noted in August, in two (Uhnin and Slupia) - in July and in other two (Naroczyce and Slupia) - in June. Positive influence of temperature on starch content was noted only in August in Karzniczka. Starch content in tubers of Ametyst and Gawin cultivars depended on precipitation sum in August, Satina cultivar - in July, Oberon cultivar - in June and July, and Cekin, Finezja, Jurek, Stasia and Tajfun cultivars - on precipitation in July and August. Source


Rymuza K.,Siedlce University Of Natural Sciences And Humanities | Radzka E.,Siedlce University Of Natural Sciences And Humanities | Lenartowicz T.,The Research Center for Cultivar Testing in Slupia Wielka
Journal of Ecological Engineering | Year: 2015

This elaboration was based on yields of nine medium-early cultivars of potato grown in Karzniczka station belonging to COBORU(Research Centre for Cultivar Testing) and on monthly precipitation sums during the growing season (April - August). For each of the cultivars separately in subsequent years and for precipitation sums in particular months of the growing season (IV-VII) polynomial regression models of precipitation - cultivar's yield - were calculated. At the beginning of the growing season the yield of medium-early cultivars of potato was negatively correlated with monthly precipitation sums, while in the final stage of vegetation - this correlation was positive. The lowest yield of Stasia cultivar was noted with monthly precipitation sum of 34-38 mm in April, Tajfun cultivar with May precipitation from 100 to 120 mm, Finezja and Jurek cultivars with monthly June precipitation of 120 mm. Whereas maximum yield of Cekin and Jurek cultivars was noted with August precipitation of about 100 mm. Source


Sosnowski J.,Siedlce University Of Natural Sciences And Humanities | Jankowski K.,Siedlce University Of Natural Sciences And Humanities | Domanski P.,The Research Center for Cultivar Testing in Slupia Wielka | Herda D.,Siedlce University Of Natural Sciences And Humanities
Journal of Ecological Engineering | Year: 2015

The aim of this paper is to analyze yield variation of Dactylis glomerata and Festuca pratensis varieties grown on organic and mineral soil. This paper has drawn on two field experiments set up and carried out between 2010 and 2013. The experiment was conducted in two experimental stations: one in the Research Centre for Cultivar Testing in Krzyzewo and the other in the Experimental Stations for Variety Testing in Uhinin. The experiment in Krzyzewo was set up on ploughed soil, with spring barley as a forecrop. In Uhnin the experimental plots were located on peat meadow. The experimental plots were sown with varieties of Dactylis glomerata: Niva, Tukan, Amila, Crown Royale and with varieties of Festuca pratensis: Limosa, Pasja, Anturka, Amelka. The full exploitation of Dactylis glomerata varieties was due between 2012 and 2013, whereas for Festuca pratensis it was due between 2011 and 2012. In the experimental plots with the varieties of Dactylis glomerata the grass was harvested six times a year and chemical analysis of the biomass was done taking dry matter only from five cuts. The varieties of Festuca pratensis were harvested four times. Each year in the course of the experiment fresh and dry matter of each cut were weighed. The grass species and their varieties as well as the particular mowing and kind of soil where the grass was grown have an impact on the yield. On mineral soil the yield of Dactylis glomerata was higher than Festuca pratensis. On organic soil the yield of both species was similar. During the two years of experiment the highest yield among Festuca pratensis varieties was noted for Amelka whereas among varieties of Dactylis glomerata the yield was similar and differences were not statistically significant. Source


Rymuza K.,Siedlce University Of Natural Sciences And Humanities | Radzka E.,Siedlce University Of Natural Sciences And Humanities | Lenartowicz T.,The Research Center for Cultivar Testing in Slupia Wielka
Communications in Biometry and Crop Science | Year: 2015

This work is based on data on monthly air temperature and precipitation and early potato yields in 2000-2013 obtained from seven COBORU (Research Centre for Cultivar Testing) stations in east-central Poland. The relationships between potato yields and average monthly air temperatures and monthly precipitation of the growing season were studied with step-wise multiple regression followed by polynomial regression. Precipitation affected early potato yields more than temperature, particularly in June and July. © CBCS 2015. Source


Rymuza K.,Siedlce University Of Natural Sciences And Humanities | Lenartowicz T.,The Research Center for Cultivar Testing in Slupia Wielka | Radzka E.,Siedlce University Of Natural Sciences And Humanities | Bombik A.,Siedlce University Of Natural Sciences And Humanities
Communications in Biometry and Crop Science | Year: 2015

Analyses were performed on a tuber yield dataset consisting of yield data for 14 second early edible potato cultivars, obtained from a series of multi-year (2010-2013), multi-location PDO (post-registration variety testing) experiments. The trials were conducted at 6 experimental stations at the Research Centre for Cultivar Testing (COBORU) in Słupia Wielka (Poland). The objective of this work was to evaluate the response of potato cultivars to diverse environmental conditions in Poland, taking into account total precipitation and mean air temperature during the growing season. The analyses demonstrated that there was a significant interaction between cultivars and years as well as between cultivars, years, and locations. On the contrary, the ‘cultivar x location’ interaction was not significant. The structures of both the significant interactions were analysed using mixed multidimensional and joint regression models. The cultivars Ametyst and Bogatka did not interact with the environment, but only the first cultivar was considered stable. All the remaining cultivars significantly interacted with the environment, in particular Finezja and Oberon, which responded significantly to environmental conditions during the growing season. © CBCS 2015 Source

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