Browsing by Author "Przystalski, Marcin"

Now showing 1 - 3 of 3
  • Thumbnail Image
    Item
    Assessment of Resistance of Barley Varieties to Diseases in Polish Organic Field Trials
    (MDPI, 2024) Lenartowicz, Tomasz ; Bujak, Henryk; Przystalski, Marcin; Mashevska, Inna; Nowosad, Kamila; Jończyk, Krzysztof; Feledyn-Szewczyk, Beata
    Leaf rust and net blotch are two important fungal diseases of barley. Leaf rust is the most important rust disease of barley, whereas net blotch can result in significant yield losses and cause the deterioration of crop quality. The best and the most environmentally friendly method to control diseases is to cultivate resistant varieties. The aim of the current study was to identify barley varieties with an improved resistance to leaf rust and net blotch in Polish organic postregistration trials conducted in the years 2020–2022. For this purpose, the cumulative link mixed model with several variance components was applied to model resistance to leaf rust and net blotch. It was found that the reference variety Radek was the most resistant to leaf rust, whereas variety Avatar outperformed the reference variety in terms of resistance to net blotch, although the difference between the two varieties was non-significant. In the present study, the use of the cumulative link mixed model framework made it possible to calculate cumulative probabilities or the probability of a given score for each variety and disease, which might be useful for plant breeders and crop experts. Both, the method of analysis and resistant varieties may be used in the breeding process to derive new resistant varieties suitable for the organic farming system.
  • Thumbnail Image
    Item
    Comparison of spring barley (Hordeum vulgare L.) varieties grown in organic farming conditions: lodging and plant height
    (The Scientific Agricultural Society of Finland, 2025) Lenartowicz, Tomasz; Bujak, Henryk; Przystalski, Marcin; Nowosad, Kamila; Jończyk, Krzysztof; Feledyn-Szewczyk, Beata
    Lodging is one of the main factors influencing yield reduction in both organic and conventional systems. In the organic system, lodging is mainly controlled by selecting varieties with increased resistance to lodging, by regulating sowing density, or by cultivation of varieties of appropriate height. The present study aimed to compare ten varieties tested in the years 2020–2022 in organic trials in terms of plant height and resistance to lodging in two growth phases (milk and harvest). Depending on the analyzed trait, a linear or cumulative link linear mixed model was fitted on plot data. The analyses showed that variety Farmer was the most resistant to lodging in the two growth phases, whereas varieties KWS Vermont and Rubaszek were less resistant to lodging in two growth phases than Farmer, but only at the milk phase, the differences were significant. Furthermore, Radek was the tallest among the tested varieties, whereas Farmer was classified as mid-tall. According to Wricke’s ecovalence coefficient, Bente was the most stable, while Farmer ranked third. Therefore, varieties that are the most resistant to lodging and are the most stable in terms of height, should be promoted for cultivation.
  • Thumbnail Image
    Item
    Yield Stability and Adaptability of Spring Barley (Hordeum vulgare) Varieties in Polish Organic Field Trials
    (MDPI, 2024) Lenartowicz, Tomasz; Bujak, Henryk; Przystalski, Marcin; Piecuch, Karolina; Jończyk, Krzysztof; Feledyn-Szewczyk, Beata
    In the next few years, the demand for organic crops, including barley, will grow. Barley is one of the world’s most important crops cultivated for food and feed. With the forecasted increase in cropped area, there is a need for stable, well-adapted and high-yielding varieties. The aim of this study was to assess the yield stability of ten varieties tested in the Polish organic post-registration trials in the years 2020–2022. For this purpose, we fitted a linear mixed model on plot data. Additionally, for each variety, we calculated the probability of the yield falling to a certain threshold. It is shown that the Bente variety was the highest-yielding among the tested varieties. The Pilote variety was the most stable in terms of Shukla’s stability variance. Furthermore, for the three highest-yielding varieties, the lowest values of the simultaneous selection index and the probability of falling below a certain threshold were obtained. We can, therefore, conclude that the highest-yielding varieties should be promoted for cultivation. Moreover, new varieties suitable for organic farming can be bred from the highest-yielding and most stable varieties.