Agricultura – Ştiinţă şi practică nr. 3- 4(83-84)/2012 - 38 - RESEARCH CONCERNING THE STRORAGE CONDITIONS UPON POTATO STOLONIZATION AND TUBERIZATION Moldovan Cristina, G. Morar, M. Duda, Camelia Todoran, Iuliana Dan, I. Vitos University of Agricultural Sciences and Veterinary Medicine, Faculty of Agriculture 3-5Manastur St., 400372, Cluj-Napoca, Romania; cristinamoldovan2009@yahoo.com Abstract. The researchers conducted within the vegetation house of UASVM Cluj-Napoca aimed to observe the reaction of potato stolonization and tuberization to storage conditions of normal temperature (2 - 4°C) and higher temperature, in which case sprouts emerge; in the second case, during the 6 – 7 months of storage, the sprouts are broken twice, following a third generation of sprouts which will evolve into tuber producing plants. The number of tubers and stolons was observed at 20 and 45 days from plant emergence. The total number of tubers formed at 45 days from emergence was considered the total number of tubers/plant. Keywords: storage conditions, stolonization, tuberization, stolons and tubers number. INTRODUCTION The study of tuber formation (tuberization) is a very important process not only because of their complex genesis phenomena, but also because of the high understanding value of the process involved in the potato plant development. The distribution of the tubers on size fractions within the crop is influenced both by the tuberization period and the stolon number formed on a plant. It is the key element of the destination and the quality of the yield for commercialization (P. H. Brown, 2008). Scientific research proved that around a half (50%) of the productivity potential of the potato is determined by the biological value of the seed (G. Morar, 2011). Storage conditions of seed potato infuences the phisical quality and seed yield of potato. Potato ability of forming tubers is influenced by sprouting date and by braking of the sprouts during storage, which confirms the improtance of the storage conditions upon yielding ability (physiological degeneration). Seed yields obtained in this way are a consequence of the physiological degeneration of potato (Erica Bulucz, 2011). MATERIAL AND METHOD To underline the influence of storage conditions upon the biological processes of tuberization and stolonization, an experiment was conducted in 2012, in UASVM Cluj- Napoca greenhouse. Pots were used and the experiment had the following factors and graduations: • Factor A- Storage conditions -a 1 = optimum, planting of sprauted tubers without breaking the sprouts -a 2 = inappropriate, planting of sprauted tubers after cutting off the sprouts twice • Factor B- The biological category having the graduations: -b 1 = B Class Certified -b 2 = Base class Super elite The biological material use in the experiment was Christian variety coming from INCDCSZ Braşov. The seed tubers were sorted and calibrated on the same size keeping in