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  • Author: Katarzyna Marcinkowska x
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Open access

Katarzyna Marcinkowska and Agnieszka Łacka

Summary

The effective dose of six herbicidal ionic liquids containing glyphosate [N-(phosphonomethyl)glycine] was investigated. Varied biological activity of the tested compounds was observed depending on the type of cation and targeted plant species. In the case of common lambsquarters, the lowest effective dose was obtained for compounds containing didecyldimethylammonium and di(hydrogenated tallow)dimethylammonium cations. In the case of white mustard, the lowest ED50 and ED90 values were obtained for the reference compound, which contained glyphosate isopropylamine salt. These parameters were determined using dose efficiency curves based on log-logistic models with three or four parameters. The study indicates that ionic liquids with glyphosate may be used as a new form of this herbicide in the future.

Open access

Katarzyna Kowalczyk, Janina Gajc-Wolska and M. Marcinkowska

The Influence of Growing Medium and Harvest Time on the Biological Value of Cherry Fruit and Standard Tomato Cultivars

The objective of this study was to examine some quality traits of tomato fruits, concerning chemical composition, in relation to the type of growing medium and harvest time. Cherry (‘Dasher’ and ‘Organza’) and standard (‘Admiro’ and ‘DRW 7594’) tomato cultivars were grown in a greenhouse with controlled climate and drip fertilizing system, in three different growing media. Environment friendly media - coconut fiber and wood fiber were compared to rockwool, commonly used as a standard horticultural medium. The type of tomato cultivar as well as harvest time significantly influenced fruit quality. The highest fruit quality was obtained from red cherry ‘Dasher’ F1 cultivar in the July harvest. The content of macronutrients in tomato fruit were significantly depend on growing media. The higher content of phosphorus was obtained in tomato fruits from plants cultivated on coconut fiber and nitrates from rockwool. The content of sugars, TSS and ascorbic acid in tomato fruit mostly depended on the growing medium. The most total sugars had fruits when plant cultivated on coconut fiber. Coconut fiber, wood fiber and rockwool can be used as the alternative media for different soilless growing systems, without a significant change of the taste quality of tomatoes.

Open access

Katarzyna Kowalczyk, Janina Gajc-Wolska, Monika Marcinkowska, Magdalena D. Cetner and Hazem M. Kalaji

Abstract

Endive (Cichorium endivia L.) is a leaf vegetable with high vitamin and nutritional values. Therefore, an increase of its cultivation in Poland and other European countries has been observed in recent years. The aim of this research was to study the effect of different growth media on the quality and photosynthetic efficiency of different endive cultivars. The experiment was conducted in controlled greenhouse conditions. Endive was grown in three independent NFT cultivation systems: a standard culture medium (control, A1), a culture medium concentrated three-fold (A2) and a medium concentrated five-fold (A3). Four cultivars were used: ‘Kethel’, ‘Barundi’, ‘Galanti’ and ‘Perceval’. The plants were examined for the number and weight of fully-grown leaves and the weight of roots, dry matter content and chemical quality attributes of endive such as ascorbic acid (AA), total soluble solids (TSS), chlorophyll and proline. In addition, several physiological traits such as modulated chlorophyll a fluorescence were measured.

Both three-fold and five-fold increases of ion concentration in the nutrient solution induced stress in the endive plants. Our results showed that the photosynthetic efficiency of the tested endive plants was affected by the cultivar factor and only the highest (five-fold) ion concentration in the nutrient solution. Growth under a medium of three-fold ion concentration did not affect the photosynthetic efficiency, despite observed changes in the growth and quality parameters of the endive plants. This study suggests that the type of fluorescence measurements used in this experiment (modulated) cannot be recommended as a sufficient bioindicator during endive production.