Scientific Papers Series B Horticulture

Scientific Papers. Series B, Horticulture. Vol. LVII, 2013Print ISSN 2285-5653, CD-ROM ISSN 2285-5661, Online ISSN 2286-1580, ISSN-L 2285-5653STUDIES UPON THE PHONOLOGY OF ROSIE DE ARIES ONION PLANTSFROM THE FIRST YEAR OF THE SEEDS PRODUCTION PROCESS ANDTHE MAIN CHARACTERISTICS OF THE PARENT PLANTS FROM 2007UNTIL 2009 YEARAbstractJanina-Claudia CPUAN, Elena TEFNESCU, Elena Liliana DUMITRACU,Minerva HEITZVegetable Research and Development Station Iernut, Str. Energeticianului 1A,Iernut, jud. Mures, RomaniaCorresponding author email: elenastef14@yahoo.comThe research was carried out in the period of 2007-2009 year, in the environmental conditions of SCDL Iernut. Thisspanned the duration of vegetation phases of plans from the experimental variants, since I st year-parent plant phase, inthree eras of sowing. The vegetation period of the parent plants (emergence- bulb maturity) was, as average on thisthree years of study, of: 125 days in the Ist age (1751 o C), 110 days in the II nd age (1821 o C) and 106 days in the IIIrdage (2130 o C). The studied characteristics were: weight of the bulb, the longitudinal diameter, the transversal diameter,the shape index and the height of the plant.Key words: phenological dates, important characteristics of the bulb.INTRODUCTIONThe area of origin and the spread of Alliumgenus on globe and also the phenotypicvariability of characteristics for adaptability tothe bulb to different environmental conditions.Through the process of improvement andselection, experts have created valuablevarieties and hybrids of onion.Knowledge of the specific requirements ofgrowth and development of each cultivardetermines the development of specificproduction technologies.This paper represents a sequence of study plantrequirements of Rosie de Iernut red onion forthe phases of growth and development in theenvironmental conditions of SCDL Iernut.MATERIALS AND METHODSThe investigations were carried out on threebiological cycles “from seed to seed”.The experiences were organized into fourrehearsals and three epochs (ages).The biological material used for the obtainingof the parent plants bulbs was made from theseed of the author, the Rosie de Iernut variety.Have been studied the vegetation phases andphenophases, having as main objective theduration of phenophases in correlation with theamount of accumulated temperature onphenophases and the influence of someimportant characteristics of the biologicalmaterial (bulbs – parent plants).During the periods of experience for producingthe bulbs-parent plant (I st year) have beencarried out specific maintenance work. Havebeen carried out observations and biometricmeasurements for the selection of biologicalmaterial, where were made also the biologicalpurification as special works in production ofthe biological material for the multiplication ofa cultivar.In the laboratory, after harvesting the bulbshave made observations and biometricalmeasurements for choice, selection ofbiological material typical for the variety. Thebiometric calculations were establishedselection parameters using confidence intervalsof the varietal characteristics of the variety,thus eliminating ± the variants.RESULTS AND DISCUSSIONSThe important stages of the experiences ofproducing bulbs were: sowing, emergence,commencement of the bulb (figure 1), thedeeply bulb formation and bulb harvesting.169