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1
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Effect of plant pruning and topping on yielding of eggplant in unheated foil tunnel

100%
Buczkowska H.
Acta Scientiarum Polonorum. Hortorum Cultus
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2010
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tom 09
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nr 3
Due to strong eggplant growth and the formation of large vegetative weight quantities in growing under glass and foil it was deemed useful to conduct studies on the effect of pruning intensity on yielding of this vegetable in rooms. The aim of the foregoing studies was to demonstrate the effect of plant pruning and topping manner on yield quantity and earliness. The experiment was conducted in the years 2001–2003. The study objects were the plants of ‘Epic F1’ cultivar. Eggplant was grown in rigid foil cylinders of the capacity of 10 dm3 in the peat substrates. The plants were trimmed, managing for one, two, three, four, five, six guiding shoots and in the natural form, without trimming. Topping cut was performed in each combination after the first fruit harvest. The experiment was established and conducted as a two-factor one, in accordance with a complete randomization system: A – pruning method (a = 7), B – topped and non-topped plants (b = 2). Each combination of the examined factors was represented by 20 plants (experimental units). A significant effect of pruning intensity on the quantity and earliness yielding was demonstrated. The highest marketable fruit yield was obtained from plants managed for two (3.82 kg.m-2), three (3.98 kg.m-2), and four (3.87 kg.m-2) guiding shoots. Managing for one guiding shoot significantly decreased the total and marketable fruit number. The highest early yield was collected from plants managed for one and two guiding shoots. A single topping cut performed after the first fruit harvest did not affect marketable yield and marketable fruit number.
2
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The influence of benzyladenine on the flowering of Liatris spicata L. 'Alba' cultivated for cut flowers in an unheated plastic tunnel and in the field

100%
Pogroszewska E., Sadkowska P.
Acta Agrobotanica
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2008
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tom 61
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nr 1
The study focused on the influence of benzyladenine (BA) on the flowering of Liatris spicata L.‘Alba’ cultivated for two years in an unheated plastic tunnel and in the field. Benzyladenine at a concentration of 0, 100, 200, 400 mgdm-3 was applied on the leaf twice during both years of the experiment. It was noted that cultivation of Liatris spicata L.’Alba’ in an unheated plastic tunnel leads to the growth of longer inflorescence stems with a bigger fresh weight and a larger number of primary shoots. However, in comparison with control plants, it decreases the yield of inflorescence stems in the first and second year of the plants’ flowering. It is benefi cial to apply benzyladenine at a concentration of 400 mg x dm-3 on the leaves of Liatris spicata L. ‘Alba’ cultivated in an unheated plastic tunnel, because this treatment increases the number and fresh weight of inflorescence stems as well as the number of primary shoots in the first and second year of the plants’ flowering. It is also justifi ed to apply benzyladenine at a concentration of 400 mgdm-3 on Liatris spicata L. ‘Alba’ cultivated in the field, as it leads to a greater number and fresh weight of inflorescence stems in the first and second year of flowering.
3
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Effect of substrate type and nitrogen fertilization upon yielding and chemical composition of "Elsanta" strawberry cultivar grown in unheated foil tunnel

80%
Jarosz Z., Konopinska J.
Acta Scientiarum Polonorum. Hortorum Cultus
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2010
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tom 09
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nr 1
The main factors determining the quantity and quality of the yield of plants grown in the soilless system is the kind of cultivation substrate used and the level of supplying the plants with nutrients. Studies conducted in the years 2005–2006 were aimed at determining the effect of substrates (peat, peat mixed with pine bark in the proportion of 1:1, peat with pine sawdust in the ratio of 1:1), as well as of differentiated nitrogen dose (140 and 210 mg N·dm-3) upon yielding, chemical composition of strawberry (Fragaria × ananasa Duch.) leaves and fruit, cultivar „Elsanta”, grown in unheated foil tunnel. In those studies no significant differences were found in total and marketable yield of strawberry fruit grown in peat, as well as in peat with pine bark. Significantly smaller total (435.8 g·plant-1) and marketable (286.5 g·plant-1) fruit yield was reported when strawberries were grown in peat mixed with pine sawdust. In plants grown in peat mixed with sawdust significantly smaller fruit unit weight (10.7 g) was found, as compared to plants that grew in the remaining substratums. In our studies no significant effect of differentiated nitrogen fertilization upon strawberry yielding was demonstrated. In the leaves of strawberries fertilized with nitrogen in the dose of 210 mg N·dm-3 we found significantly more nitrogen and phosphorus, as well as less calcium and magnesium, as compared to plants fertilized with smaller doses of this nutrient. The fruit of strawberries fertilized with a higher nitrogen dose contained significantly more nitrogen and potassium, as well as less vitamin C and soluble solids, as compared to the fruit collected from plants fertilized with nitrogen in the dose of 140 mg N·dm-3.
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Wartość biologiczna owoców truskawki uzyskanych w różnych systemach uprawy

51%
Krol K., Swiderski A.
Zeszyty Problemowe Postępów Nauk Rolniczych
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2009
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tom 539
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nr 1
Owoce odmiany ‘Elsanta’ z uprawy w substracie torfowym, w tunelu ogrzewanym i nieogrzewanym oraz w gruncie (kontrola) poddano analizom chemicznym. Badania wykonano w dwóch latach owocowania, w trzech cyklach uprawowych. W obu owocowaniach owoce z kontroli zawierały najwięcej ekstraktu (odpowiednio 9,34 i 9,26 Brix). W pierwszym owocowaniu kwasowość była najwyższa dla owoców z kontroli (1,07 g∙100 g-1 św.m.), a najniższa dla owoców z tunelu nieogrzewanego (0,80 g∙100 g-1 św.m.). W drugim roku plonowania nie było różnic w kwasowości owoców z tunelu nieogrzewanego i kontroli (odpowiednio 0,80 g∙100 g-1 św.m. i 0,81 g∙100 g-1 św.m.), a owoce z tunelu ogrzewanego miały wyższą kwasowość (0,88 g∙100 g-1 św.m.). Zawartość kwasu askorbinowego w obu latach owocowania była niższa dla owoców z kontroli (odpowiednio 68,90 i 60,10 mg∙100 g-1 św.m.). W pierwszym owocowaniu najwięcej kwasu askorbinowego zawierały owoce z tunelu ogrzewanego (78,08 mg∙100 g-1), a w drugim owocowaniu owoce z tunelu nieogrzewanego (76,93 mg∙100 g-1). Zawartość antocyjanów w pierwszym plonowaniu była największa dla owoców z tunelu nieogrzewanego (21,14 mg∙100 g-1), a w drugim owocowaniu dla owoców z tunelu ogrzewanego (18,62 mg∙100 g-1). Zawartość kwasu elagowego w pierwszym jak i drugim owocowaniu była najwyższa dla roślin z tunelu nieogrzewanego (odpowiednio 8,59 i 10,44 mg∙100 g-1).
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