206 Foliar fertilizers agroleaf and cropmax and their effect upon the productive and qualitative potential to some semilong cucumbers hybrids cultivated in industrial greenhouses nonconvetional heated Becherescu Alexandra 1* , Horgoş A. 1 , Popa D. 1 , Ţâru O. 1 1 Banat’s University of Agricultural Sciences and Veterinary Medicine Timişoara, Faculty of Horticulture and Sylviculture *Corresponding author. Email: alexandra_becherescu@yahoo.com Abstract Cucumbers culture in greenhouses was and still is an important culture out of the vegetables cultivated in the world and in our country. Along time, there appeared different varieties and hybrids, so that nowadays semilong cucumbers are very important together with the long and small (cornichon) ones. Because of the high energetic costs of this culture it is necessary to apply new improved and modern technologies or some important operations of these technologies that will give an increase of production and efficacy. By this article we present some technological operations that might increase considerably the production and which are economically efficient. We refer mainly to some products which contain, among macro and microelements some other components that are favourable and have an immediate effect upon plants metabolism, such as: chelat microelements, auxins, citokinins, giberellins, organic aminoacids, vitamins, vegetal enzymes etc. Key words culture, vegetables, varieties, hybrids, fertilizers, cucumbers, production, greenhouse Vegetables culture in greenhouses and mostly cucumbers culture, where the investments and microclimate factors that have to be ensured are extremely high, needs periodical renews in order to increase the productive potential. At the same time, there have to be considered some technological operations that might increase considerably the productivity. Among these, we refer to extra root fertilizers, in the past years appearing some products that contain, along macro and microelements some other favourable components with immediate effect upon plants metabolism, such as chelat microelements, auxins, citokinins, giberellins, organic aminoacids, vitamins, vegetal enzymes etc. The productivity potential, as a main feature of each plant, considered not only biologically, but also economically has to be analysed under all aspects. Technologically, we have to assure the proper climatic conditions that help the plants to give the whole productivity potential, while we have to find the optimum activities in order to obtain good varieties and hybrids. A plant’s production is represented by the interaction between genotype and its expression in the climatic conditions of its culture, which in greenhouses are controlled exclusively by the grower. Productivity, as genetic feature, is determined by the physiological features and also by plant’s morphology, this being easier to evaluate. Cucumbers’ culture, together with tomatoes and green pepper, represents an important culture. Different factors, such as: the energy level (high costs), the late planting period and the group of varieties and hybrids, made cucumber’s culture to be considered not efficient concerning the economical costs, so that it was limited and almost disappeared in greenhouses with conventional heating. The evolution of cucumber’s culture, correlated to the energetic costs along the years, together with the late planting period in Ist cycle and earlier in the IInd and also together with the varieties that not always had a high productivity potential were direct consequences for obtaining low, not efficient productions. According to all these, there were made up different possibilities for culture systems and fruiting in vegetation and improving the hybrids, mainly to the semilong group, where the technology is easier, but mainly improving those technological operations with immediate effect upon metabolism by an increase of extra root nutrition, which is faster and more efficient in some phenophases.