Convolvulus genus is a representative of the family of Convolvulaceae. Convolvulus plants are broadly distributed all over the world and has been used for many centuries as herbal medicine. Convolvulus genus contains various phytochemicals such as flavonoids, alkaloids, carbohydrates, phenolic compounds, mucilage, unsaturated sterols or terpenes, resin, tannins, lactones, and proteins. phytochemical composition, antimicrobial and antioxidant activities, application as food preservative, traditional medicine use, anticancer activities, and clinical effectiveness in human of Convolvulus plants. All the parts of Convolvulus plants possess therapeutic benefits; preliminary pharmacological data validated their use in traditional medicine. However, further preclinical and clinical experiments are warranted before any application in human health.

Plants of the genus Brassica occupy the top place among vegetables in the world. This genus, which contains a group of six related species of a global economic significance, three of which are diploid: Brassica nigra (L.) K. Koch, Brassica oleracea L., and Brassica rapa L. and three are amphidiploid species: Brassica carinata A. Braun, Brassica juncea (L.) Czern., and Brassica napus L. These varieties are divided into oily, fodder, spice,

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Studies were based on a field experiment performed in Parczew, in 2009-2011. The field trials were located on podzolic soil. The experimental factors were plant production systems (integrated and ecological) and four potato cultivars. Potato tubers were sown at a spacing of 70 x 35 cm. The integrated system included phosphatic and potassium fertilization equivalent to the uptake of the following quantities of nutrients: 110 kg N, 60 kg P, 70 kg K ha-1. Compost supplied in a dose of 35 t ha-1 was used only once in a crop rotation, under potato. The chemical plant protection treatments were applied according to the thresholds of damage caused by agrophages. No fertilization or pesticides were introduced in the ecological system, except for an application of a preparation against potato beetle. Two-year-old compost was used under potato in a dose of 35 t ha-1. Weed control in the organic system consisted of harrowing with a weeder until plant emergence, triple hilling and single hand hoeing prior to the last hilling. Potato tubers were harvested at full maturity. Samples of potato tubers for chemical analyses were taken from plots during the harvest. The content of some macro-and microelements in the dry matter of potato tubers was determined by the AAS method. The organic farming system has contributed to a higher accumulation of iron in tubers but the content of zinc was lower in comparison with the integrated system. The two farming systems did not have a significant effect on the content of sodium, copper or manganese in potato tubers. Genetic traits of the analyzed cultivars had the strongest influence on the content of elements in potato tubers. Tubers from the cultivar Irga had the highest content of sodium and copper. The concentration of zinc was the highest in tubers of cv. Satina, iron-in tubers of cv. Bryza and manganese-in tubers of cv. Jelly. The response of potato cultivars to the production systems has proved to be diverse.

The increase in consumer awareness about food and health has led to an increase in the demand for food containing biologically active compounds, especially antioxidants, which can help the human body fight the oxidative stress. Many unconventional or new sources of antioxidants have been discovered, which is a priority not only for food, but also for the pharmaceutical industry. It has been shown that not only raw materials, but also waste from fruit and vegetable processing contains valuable molecules, such as: proteins, essential amino acids, antioxidants, dietary fibers, natural pigments, or aromatic compounds, that can be extracted, purified and modernized in food products or pharmaceuticals with added value. This is the basis of huge potential of not only plant and biotechnology raw materials, but also food waste for the use as a source of antioxidants.