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The article contains data concerning the production and economic aspects of producing starch from three starch potato cultivars, such as Adam, Pasja Pomorska and Ślęza. The considerations are based on an experiment conducted in 2008–2010 at the Experimental Station of the University of Warmia and Mazury in Olsztyn, situated in Bałcyny (N = 53°35’49’’; E = 19°51’20,3’’). The study has shown that the cultivar Adam is the least economically useful starch potato, as it gives low starch yields, generates very high unit costs and presents the least favourable response to modifications in foliar fertilization that do not lead to the improvement of yielding. The lowest unit costs of producing starch occurred in the production of the potato cultivar Ślęza. Depending on the applied foliar fertilization treatments, the starch production unit costs decreased the most for the cultivar Pasja Pomorska, reaching the highest cost reduction level in the variant consisting of soil dressing A – 280 kg ha⁻¹ NPK (80 N, 80 P, 120 K) and foliar fertilization variant a – Basfoliar 12-4-6 [8 dm ha⁻¹].
In 2007-2009, eighteen gooseberry (Ribes grossularia L.) cultivars were evalu­ated in the growing conditions of central Poland. They were 'White Smith', 'Captiva- tor', 'Hinnonmaki Gelb', 'Hinnonmaki Rot', 'Invicta', 'Kamieniar', 'Krasnoslavian- ski', 'Laskovij', 'Macurines', 'Misorskij', 'Niesluchovski', 'Pax', 'Pixwell', 'Pusz- kinskij', 'Rochus', 'Rolonda', 'Ruskos' and 'Spine Free'. The following cultivar features were assessed: fruit yield (date of ripening, yield, size of fruits and colour of fruit skin), susceptibility to fungal leaf diseases: American powdery mildew Sphaero- theca mors-uvae (Schwein.) Berk. et Curt. and leaf spot Drepanopeziza ribis (Kelb.) Petrak, plant growth (the height and the width of bushes) and plant habit. Cultivars 'Niesluchovski', 'Hinnonmaki Gelb', 'Hinnonmaki Rot' and 'Invicta' were the earli­est to ripen. Fruits of 'Captivator' and 'Spine Free' ripened the latest. The highest fruit yields were harvested from the cultivars 'Pixwell', 'Puszkinskij' and 'Laskovij', and the lowest were from 'Ruskos', 'Pax', 'Hinnonmaki Gelb' and 'Niesluchovski'. The various cultivars differed in the colour of the fruits. They produced green, yel­low, light red, red, and dark red fruit skins. The most susceptible to American pow­dery mildew were 'White Smith' and 'Krasnoslavianski'. The remaining cultivars showed very little infection or they were not infected at all. The leaves of all cultivars were affected by leaf spot in the low or medium range, except for the cultivar 'White Smith', whose leaves were highly infected by this disease. The bushes of the cultivars 'Pixwell', 'Ruskos', 'Laskovij' and 'Misorkij' grew the most vigorously. 'White Smith', 'Niesluchovski' and 'Hinnonmaki Gelb' produced the smallest plants. Culti­vars 'Macurines' and 'Puszkinskij' were characterized by the widest spreading plant habit.
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