Research Journal of Agricultural Science, 48 (4), 2016 3 STUDY OF THE DEVELOPMENT OF PHASEOLUS VULGARIS L. IN GREENHOUSE UNDER ELECTROMAGNETIC FIELD Claudia BALINT, I. OROIAN, Antonia ODAGIU, Adriana OPINCARIU, C. MĂLINAŞ University of Agricultural Sciences and Veterinary Medicine Cluj-Napoca, Faculty of Agriculture, Department of Environmental and Plant Protection Calea Mănăștur, no. 3-5, Cluj-Napoca, Romania,ioan.oroian@usamvcluj.ro Abstract. The study concerning the evolution of beans plants in the electromagnetic field, was carried out in greenhouse conditions, namely in the "House of Vegetation" of University of Agricultural Sciences and Veterinary Medicine Cluj – Napoca, in the experimental year of 2016. The stem lengths, beans and pods production, dry matter content of plants, were recorded, in conditions of irradiation and no irradiation. The process of stems growing, one month after the establishment of culture, in greenhouse conditions, highlights a superior development, statistically ensured at a 0.1% threshold of significance, when plants were placed under electromagnetic field. Two months after sowing, the growth process of beans steams in greenhouse conditions, shows a higher development, statistically ensured at different thresholds of significance when plants were placed under electromagnetic field. In the absence of irradiation, two months after sowing, the length of the stems was of 19.63 and 24.06 cm, respectively. The mean of pods obtained from irradiated plants (5 pieces) is lower, compared with control (6.40 pieces), but the difference is not statistically assured at significance threshold of 5%. The evolution of the average number of beans in the present experiment has an identical trend with that recorded in the production of pods. The bean production records differences, statistically assured at the threshold of 5%, between the quantities of beans obtained from plants placed under the electromagnetic field and from the non- irradiated plants. The dry matter records an average of 16.62% in irradiated plants, while in control it was only of 11.04%, the difference being statistically assured at the threshold of 5%. In the present study, it can be noted that the irradiation influences, in a positive manner, the increasing of the stem length, and dry matter, but to the decrease of the number of pods, and beans’ length. Key words: Phaseolus vulgaris L., electromagnetic field, irradiation, greenhouse INTRODUCTION Beans plants belongs to the Phabaceae family, Phaseolus L. genus which includes over 200 species of American or Asian origin (also species originating from Africa and Australia), of which about 20 species are cultivated (MUNTEAN ET AL., 2011; BÎLTEANU and BÎRNAURE, 1989; MIHĂILESCU, 1990). Phaseolus vulgaris (L.) Savi. (Common beans) is the most widespread species of American origin. Native from Mexico and Argentina (where wild ancestors were found) it has many forms grouped into four main varieties, which are differentiated by the shape of grains ("sphaericus" "ellipticus" "oblongus" "compressus"), and among them many intermediate types, given by a certain percentage of cross-pollination, including the nanus variety, namely dwarf beans (BÎLTEANU ET AL., 1991; CEAUŞESCU ET AL., 1984; CHILOM, 2002). The physical methods used to increase the production of vegetables are based on a series of physical factors for stimulating plant growth and innovative treatment processes aiming the acceleration of plant growth proportional with the production yield (ALADJADJIYAN, 2000, 2007; ALEXANDER AND DOIJDE 1995; DAS AND BHATTACHARYA, 2006). AS BAICU AND SĂVESCU (1986), HOZA (2003), SAMOIL (2007), IMBREA (2007, 2014),