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    Effect of Drip Fertigation with Nitrogen Application on Bioactive Compounds and the Nutritional Value of Potato Tubers before and after Their Long-Term Storage
    (2021) Wichrowska, Dorota; Rolbiecki, Roman; Rolbiecki, Stanislaw; Sadan, Hicran A.; Figas, Anna; Jagosz, Barbara; Atılgan, Atılgan
    The nutritional value and the content of bioactive compounds in potato tubers are influenced by many soil, climate and agrotechnical factors. This study investigated the effect of drip irrigation and nitrogen fertilization by broadcasting and fertigation on the content of dry matter, starch, monosaccharides, total sugars, vitamin C, polyphenolic compounds, chlorogenic acid and antioxidant activity in tubers of "Augusta " potatoes. Additionally, the magnitude of the changes in the tested components during their long-term storage (6 months) was also assessed. Drip irrigation had a significant positive effect on the content of dry matter, starch, vitamin C, monosaccharides, sucrose, total sugars, total polyphenols, chlorogenic acid and antioxidant capacity. Compared to broadcasting fertilization, fertigation significantly increased the content of vitamin C, total polyphenols and chlorogenic acid, as well as the antioxidant activity of potato tubers. Long-term storage contributed to a decrease in the tested components. The exception was the content of monosaccharides, where a more than twofold increase was noted, especially in the case of irrigated tubers. The results of the research showed a beneficial effect of drip irrigation and fertigation on the content of bioactive compounds and the nutritional value of "Augusta " potato tubers.
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    Effect of subsurface drip fertigation with nitrogen on the yield of asparagus grown for the green spears on a light soil in central Poland
    (2022) Rolbiecki, Roman; Sadan, Hicran; Rolbiecki, Stanislaw; Jagosz, Barbara; Szczepanek, Malgorzata; Figas, Anna; Atılgan, Atılgan; Pal-Fam, Ferenc; Panka, Dariusz
    Abstract: During the growing period of many agricultural and horticultural plants, the use of fertigation usually increases the yield; however, the response to this treatment may depend on the cultivar. The effect of subsurface drip fertigation with nitrogen on the yield of three asparagus (Asparagus officinalis) cultivars grown for green spears in light soil was studied. The multi-year (2011–2017) field experiment was carried out on sandy soil and was arranged in a split-plot design with four replications. The first factor was the method of fertilization with nitrogen: (1) control— spreading nitrogen fertilization without irrigation and (2) subsurface drip fertigation with nitrogen. The second factor was the genotype (a cultivar) of asparagus—the following cultivars were tested: Ramada, Rapsody and Ravel. Generally, subsurface drip fertigation with nitrogen increases the marketable yield of green spears and the number of spears produced by a single plant, as well single-spear weight. ‘Ramada’ achieved the best results with all yield parameters. A significant correlation coefficient between the sum of rainfall and irrigation rates and yield parameters of tested cultivars was also found. The studies showed a varied response of the tested asparagus cultivars to the fertigation treatment.
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    Effect of the forecast air temperature change on the water needs of vines in the region of Bydgoszcz, Northern Poland
    (2022) Jagosz, Barbara; Rolbiecki, Stanislaw; Rolbiecki, Roman; Ptach, Wieslaw; Sadan, Hicran Asmin; Kasperska-Wolowicz, Wieslawa; Pal-Fam, Ferenc; Atılgan, Atılgan
    The climatic changes observed in Poland are manifested by an increase in air temperature, but not an increase in rainfall, which causes an increase in the water needs of plants, and hence the necessity to develop irrigation systems for crops. The aim of this study was to assess the water needs of grapevines in 2021-2050 in the Bydgoszcz region (northern Poland), an area with high requirements for supplementary irrigation. The calculations were based on the expected changes in air temperature according to the climate change scenario for Poland: the 4th Intergovernmental Panel on Climate Change-Special Report on Emissions Scenarios: balanced scenario (A1B). The average monthly temperature in 1981-2010 was used in the calculations. The water needs of grapevines were estimated using the reference evapotranspiration calculated using the Blaney-Criddle equation, and then using the crop coefficient and potential (crop) evapotranspiration. It was found that in 2021-2050, the water needs of grapevines, both during the growing season (May-September) and during the irrigation period (June-August), will increase by 6%. The highest and significant increase in water needs, by 10%, should be expected in August. The estimated increase in water needs of grapevines indicates the need to development sustainable irrigation systems for vineyards in northern Poland.