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The purpose of this study was to determine the influence of the soil fertilizer UGmax on zinc, copper and manganese contents in potato tubers. A three -year field experiment was carried out on soil which belonged to a very good rye complex. The experiment was established according to randomized split-plot method, in three replications. The following factors were examined: factor I: edible potato varieties (Satina and Typhoon), and factor II: doses and timing of UGmax application. As a result of conducted research, significantly smaller copper content in potato tubers was found, after usage of the soil preparation UGmax, in comparison with a control object, while zinc and manganese content continued to show only a downward trend. The influence of weather conditions and potato varieties on the copper cumulation in the dry mass of potato tuber was proved. An important influence of the factors of the experiment on the uptake of researched macroelements with the potato tuber yield was also shown.

The aim of the study was to determine the effect of applied herbicides and growth regulators on the airborne limitation of dry weed mass and the total yield of three edible potato varieties. The field experiment was established as two-factor in a (split-plot) system in three replications. The experiment examined: I factor -three moderately early varieties of edible potato: Bartek, Gawin, Honorata. II factor -five ways of using herbicides and bio-stimulants: 1. control object: mechanical care 2. Harrier 295 ZC herbicide at a dose of 2.0 dm 3 ·ha -1 , 3. Harrier 295 ZC herbicide at a dose of 2.0 dm 3 ·ha -1 and then after the plant rises the Kelpak SL bioregulator twice at a dose of 2.0 dm 3 ·ha -1 , 4. Sencor 70 WG herbicide at a dose of 1.0 kg·ha -1 , 5. Sencor 70 WG herbicide and then after the plant rises the Asahi SL bio-stimulant twice at a dose of 1.0 dm 3 ·ha -1 . The obtained test results showed that the smallest dry weed mass determined in both research dates was obtained using Harrier 295 ZC herbicide and Kelpak SL growth biostimulant (0.7 g·m -2 and 3.1 g·m -2 ), while the largest in the control object (15.1 and 64.7 g·m -2 ), respectively. The total yield of potato tubers depended on both the types of herbicides and bio-stimulants used and the varieties cultivated in the experiment. However, the weather conditions which varied in particular years significantly influenced both the size of the air-dried mass of weeds and the total yield of potato tubers.

Potato (Solanum tuberosum L.) is grown in over 160 countries. Weed competition and environmental stressors during the vegetative growth stage significantly impact crop yields. An experiment was conducted from 2012 to 2014 in Poland to assess the effect of herbicides linuron + clomazone (L+CH) and metribuzin (M) as well as herbicides mixed with biostimulants (linuron + clomazone and algae extract of Ecklonia maxima—auxins and gibberellins (L+CH+E) and metribuzin + sodium p-nitrophenolate, sodium o-nitrophenolate and sodium 5-nitroguaiacolate (M+S)) on weed infestation, marketable yield and yield components of the following three table potato cultivars: Bartek, Gawin and Honorata. In plots where potato had been treated with herbicides and herbicides mixed with biostimulants, a decline in the fresh matter of weeds was observed, ranging from 72.4% to 96.1%, which was followed by an increase in potato marketable yield (from 27.5% to 61%) and improved parameters of S. tuberosum yield components, compared with the control. Linear correlation coefficients indicated that the following characteristics: marketable yield, weight of tubers per plant and average weight per tuber were associated with weed infestation determined prior to potato harvest.

A field experiment was carried out in 2013-2016 in the Agricultural Experimental Station -Zawady of the University of Natural Sciences and Humanities in Siedlce, Poland. The examined factors included: Ithree morphotypes of winter rape: population cultivar (Monolit), hybrid semi-dwarf (PR44D06) cultivar, restored hybrid cultivar of conventional growth type (PT205); IItwo sowing methods: row spacing of 22.5 cm, row spacing of 45.0 cm; IIIfour types of applied biostimulators: control variant (without application of biostimulators), Tytanit ® biostimulator, Asahi ® SL biostimulator and Silvit ® biostimulator. The aim of the research was to determine the effect of natural plant preparation on the yield of four cultivars of winter rape. It was found that biostimulators applied in the experiments increased the thousand-seed weight on average from 0.03 to 0.1 g in comparison to the control variant. The highest value of this feature was obtained in the variant with Asahi ® SL treatment and significantly lower in plots treated with Silvit ® and Tytanit ® bioregulators. A significant increase in seed yielding was observed as the effect of natural growth stimulators. The highest value of this feature was observed in all cultivars after the application of Asahi ® SL and Silvit ® .

AbstractThe aim of the study was to determine the impact of foliar fertilizers containing amino acids, sulphur, boron on the number of productive branches, the number of pods per plant, the number of seeds in pods and the length of pods of three winter rape (Brassica napus) varieties (Monolit, PX115, PT248). The research was carried out in 2016-2017, 2017-2018, 2018-2019 at the Zawady Agricultural Experimental Station (52o03’N and 22o33’E) belonging to the University of Natural Sciences and Humanities in Siedlce, Poland. The field experiment was set up in a split-plot layout in triplicate. The area of one plot for harvest was 21 m2. The examined factors were I - morphotipe of winter rape: population variety (Monolit), hybrid restored with a semi-dwarf growth type (PX115), hybrid restored with a traditional growth type (PT248). II - types of foliar feeding: 1. treatment without biostimulator and foliar feeding, 2. Bioregulator Aminoplant, 3. Foliar fertilizer Siarkomag with foliar fertilizer Bormax, 4. Foliar fertilizer Siarkomag with foliar fertilizer Bormax and Aminoplant. Variable climatic conditions in the years of the experiment affected the studied components of seed yield of three L. morphotypes. In the year 2016-2017 of research, the plants produced the most productive branches, had the longest pods filled with the largest number of seeds. Foliar nutrition with a biostimulator containing amino acids did not significantly affect the increase of the number of productive branches, pods per plant and pod length compared to the variant on which no foliar fertilization was applied. Foliar fertilization with S and B in combination with bio-stimulators was the most effective in increasing the components of seed yield, while the number of productive branches and length of pods under the influence of foliar fertilizers was the same regardless of the application of the biostimulator. The long-stem variety had longer pods that were filled with more seeds than the others.

Field experiments were conducted at Zawady Experimental Station (University of Podlasie) in 1999-2001 to test the effect of herbicides (Sencor 70 WG, Basagran 600 SL) and their mixtures (Sencor 70 WG with Fusilade Super, Basagran 600 SL with Focus Ultra) on the content of ascorbic acid and glycoalkaloids in tubers of three potato cultivars. The application of herbicides to potato fields caused an increase in the content of ascorbic acid in comparison with the control. The statistical analysis showed a significant effect of potato cultivars on ascorbic acid and glycoalkaloid concentrations.

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