In 2020 a field experiment was conducted with mutant lines of common bean from M4 generations at the Maritsa Vegetable Crops Research Institute, Plovdiv. The aim of the study was to determine the productivity of plants in drought conditions. Twenty four mutant lines were studied in two variants: optimal (non-treated) and reduced (treated) irrigation regimes. A description of the mutant lines was made according to the following features: color: coloring of the flag; beans - length without beak; bean shape in cross section (through the seed); beans-basic coloring; flowering time. Phenological data were collected for phenophases: budding, flowering, fruit size, consumption and botanical maturity. At consumption maturity, biometric measurements were made of 5 plants per repetition on the following indicators: fresh weight (g) of a plant; number and fresh mass (g) of green beans per plant; length (cm) and width (cm) of beans, total fresh biomass (g). The highest productivity found among the treated plants in consumption maturity were the early mutant lines M 564-193-9-1-1 and 564-193-9-1-2, followed by M 564-190-1-1-1, M 564-110-1-2, and M 564-191-1-1-2, compared to the parent line L 564 and all the rest of early mutant lines. The treated plants developed the phenophases 7-10 days later than those with optimal watering.

Vermicompost may be a promising substitute for peat especially in transplant production. Vermicomposting is a sustainable solution for management of organic wastes. However, due to variability of organic wastes, vermicomposts might have varying nutrient content levels. The study compared vermicomposts from different sources on growth and nutrition of tomato (Solanum lycopersicum L.) transplants. Chemical composition of vermicomposts differed. Common characteristics were high pH and very high electrical conductivity. All vermicomposts stimulated growth of tomato transplants, with up to a 2.2-fold increase occurring in shoot biomass. Differences in growth were attributed mainly to differences in nutrient content of the potting mixtures, but some changes in physical and biological properties of the substrate could also be responsible.

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Abstract. This paper tries to illustrate how intercropping increases the overall output of a cropping system and achieving much larger yields than sole crops by using environmental resources more fully over time or more efficiently in space. The research was conducted to establish the opportunity for optimal use of the growing area in perennial vegetables crops (Asparagus officinalis L., Rheum rhabarbarum L., Cynara cardunculus var. Scolymus, Levisticum officinale) by an intercropping system with annual vegetables (Brassica rapa subsp. Chinensis, Eruca sativa) in open field. The experiment was carried out in 2018 year in Vegetable Crops Research Institute (VCRI) Maritsa, Plovdiv, Bulgaria. Crops were grown under schemes: asparagus – 200+60/50 cm; artichoke – 200+60/90 cm; rhubarb – 200+60/90 cm; lovage – 200+60/50 cm; pak choi – 55+45+45+55/20 cm and 55+30+30+30+55/20 cm; rocket – 55+45+45+55/15 cm and 55+30+30+30+55/15 cm. As a result it was determined that the use of annual crops increases efficiency of the areas in perennial vegetables during the first year of growing. Annual vegetables pak choi and rocket grown under scheme 55 + 30 + 30 + 30 + 55/20cm and 55 + 30 + 30 + 30 + 55/15cm, respectively, are suitable for an intercropping system.

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