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The study presents results of a three-year experiment of variability of different Dutch potato varieties in Serbia: Adora and Cleopatra (early), Innovator and Frisia (mediumearly) and Desiree and Kondor (medium-late). The research was conducted during 2008, 2009 and 2010, in three different soil and climatic locations: Zemun (100 m a.s.l.), Srbobran (86 m a.s.l.) and Guča (370 m a.s.l.). The four-repplicate field trials were set up using standard methodology according to the random block desing. The analysis of variance suggest that number of tubers per plant, number of market tubers per plant and total tuber yield were significantly fluctuating depending on genotype (G), year (Y) and the location (L). In addition to individual influences of different factors, their interactions were also pronounced (G x Y, G x L, Y x L, G x Y x L). In the three-year period average, the highest total yield was recorded in Zemun (35.80 t ha‫,)¹-‬ followed by Guča (29.32 t ha‫,)¹-‬ while the lowest average yield recorded was in Srbobran (27.38 t ha‫.)¹-‬ The highest average yield of tubers in the three-year period was recorded in the Cleopatra variety, followed by Adora variety, while the lowest average yield was recorded in the variety Frisia. Obtained results show that the highest yields over observed locations were recorded in early varieties that formed medium number of tubers per plant (Cleopatra and Adora) and medium late varieties (Desiree and Kondor) that expressed good resistance to high air temperatures and stress caused by drought.

The research on the effect of ecological conditions and cultivars on the yield components of potatoes was conducted in Badovinci (Western Serbia) during the period 2008-2009. The following potato cultivars were included in the experiment: early ('Cleopatra', 'Anushka' and 'Presto'), medium early ('Kuroda', 'Omega' and 'Dita'), and medium late ('Desiree', 'Roko' and 'Jelly'). The four-replicate field trials were set up using the standard methodology according to the random block design. 1 8 T The research results suggest that genotype (G) and ecological conditions (E) significantly affect all yield components of potatoes. In both years, the highest yield was recorded1 8 T in1 8 T the medium late variety 'Desiree'1 8 T 1 8 T (1 8 T 28.30 t ha‫,)¹-‬ followed by the early variety 'Anushka' 1 8 T (1 8 T 26.60 t ha‫,)¹-‬ 1 8 T while the lowest1 8 T 1 8 T yield1 8 T was 1 8 T recorded1 8 T 1 8 T in the medium early variety 'Omega' (1 8 T 13.35 t ha‫.)¹-‬ The 1 8 T results obtained show that1 8 T 1 8 T the1 8 T 1 8 T highest yields1 8 T in Western Serbia were 1 8 T recorded in early varieties1 8 T 1 8 T ('Cleopatra'1 8 T , 'Anushka' 1 8 T and1 8 T '1 8 T Presto'1 8 T) and 1 8 T medium1 8 T 1 8 T late varieties1 8 T 1 8 T ('1 8 T Desiree'), which exhibited considerable1 8 T resistance to high1 8 T 1 8 T air temperatures1 8 T and 1 8 T drought stress1 8 T. REZIME Komponente prinosa devet sorti krompira ispitivane su tokom 2008. i 2009. godine na lokaciji zapadne Srbije u selu Badovinci (75 m nadmorska visina, 44˚8044˚80' 05"N, 19˚3519˚35' 39"E). Za istraživanje korišćene su sledeće sorte krompira: rane (Cleopatra, Anushka i Presto), srednje rane (Kuroda, Omega i Dita) i srednje kasne (Desiree, Roko i Jelly). Sadnja je izvedena u prvoj dekadi aprila. Međuredno rastojanje bilo je 0,70 m a između biljaka u redu 0,30 m. Primenjena je standardna tehnologija gajenja krompira. Broj primarnih nadzemnih izdanaka određen je 65 dana posle sadnje krtola. Vađenje krompira izvršeno je početkom septembra kada je izvršeno i utvrđivanje broja krtola po biljci i ukupan prinos. 1 8 T Dobijeni rezultati ukazuju da su sorta (G) i agroekološki uslovi (E) značajno utiču na sve komponente prinosa krompira. U obe godine najveći ukupan prinos krtola zabeležen je kod srednje kasne sorte Desiree1 8 T 1 8 T (1 8 T 28,30 t ha‫,)¹-‬ zatim kod rane sorte Anushka 1 8 T (1 8 T 26,60 t ha‫,)¹-‬ dok je najniži prinos krtola utvrđen kod srednje rane sorte 1 8 T Omega (1 8 T 13,35 t ha‫.)¹-‬ Na osnovu rezultata dvogodišnjih istraživanja uticaja sorte i agroekoloških uslova na komponente prinosa u zapadnoj Srbiji, možemo izvesti sledeće zaključke:-Sorta i uslovi sredine pojedinačno i u interakciji značajno utiču na komponente prinosa1 8 T ; Za dobijanje visokih prinosa krtola u uslovima zapadne Srbije možemo preporučiti rane sorte (1 8 T Cleopatra, Anushka 1 8 T i1 8 T P1 8 T resto1 8 T), posebno u godinama sa malom količinom padavina, kao i srednje kasnu sortu 1 8 T (1 8 T Desiree), koja je pokazala dobru tolerantnost prema visokim temperaturama vazduha i suši.

The present research was conducted during the dry and warm growing seasons of 2011, 2012 and 2013 at Guča, which is a well-known potato-growing region of Serbia. Potato was grown under both rainfed conditions and with irrigation, applying two methods: sprinkler and subsurface drip irrigation. The objective of the research was to conduct a comparative analysis and assess the profitability of potato production under rainfed conditions and with irrigation by these two methods. The main outcome of the research showed that higher yields and more profitable production are achievable with irrigation, compared to rainfed conditions. Subsurface drip irrigation was found to be more profitable than sprinkler irrigation. The results provided insight into the structure and distribution of income and expenses, the income and expense growth trend, the percentage profit growth in the case of sprinkler and subsurface drip irrigation, as well as potential income losses at the national level if the irrigation methods considered are not used. A detailed analysis of the production costs provided insight into the feasibility of optimizing potato-growing approaches for all three types of production. The higher profitability of irrigated potato production opens the question of the need to increase irrigation coverage in Serbia. Copyright © 2016 John Wiley & Sons, Ltd. RÉSUMÉLa présente recherche a été menée au cours des saisons de croissance des périodes chaudes et sèches des années 2011, 2012 et 2013 à Guča, une région de la Serbie bien connue pour la culture de la pomme de terre. La pomme de terre a été cultivée sous conditions pluviales et irriguées. Deux techniques d'irrigation sont utilisées: par aspersion et par goutte-à-goutte enterré. L'objectif de cette étude était de réaliser une analyse comparative et d'évaluer la rentabilité de la production de la culture de la pomme de terre en condition pluviale et par les deux techniques d'irrigation. Les résultats principaux de cette étude ont montré qu'un rendement plus élevé et une production plus rentable sont réalisables en conditions irriguées par rapport aux conditions pluviales. L'irrigation au goutte à goutte enterrée a été trouvée être plus rentable que l'irrigation par aspersion. Les résultats ont fourni un aperçu de la structure et de la répartition des revenus et des dépenses, la tendance de la croissance des revenus et des dépenses, la croissance de la marge bénéficiaire dans l'irrigation par aspersion et l'irrigation au goutte à goutte enterrée, ainsi que les pertes de revenus potentiels au niveau national si les techniques d'irrigation choisies ne sont pas utilisées. Une analyse détaillée des coûts de production a donné un aperçu sur la faisabilité de la croissance de l'approche d'optimisation de la culture de la pomme de terre pour les trois types de production. La rentabilité plus élevée de la production de la pomme de terre irriguée ouvre la question de la nécessité d'accroître la couverture de l'irrigation en Serbie.

A total of six tomato seed populations, collected in the autumn of 2016 at different locations in Serbia (West (3), South (1), North (1) and East (1)), were enrolled in this study. Seeds of the tomato populations considered were produced in the organic growing system in the area of Zaovice (76 m a.s.l., chernozem),