The paper deals with the study of the influence of the seeds ageing and calibration on the percent of the raised plants at the main hybrids cultivated in Transylvania. The age of seed is an important factor which depends on the capacity of germination and seed răsărirea. During seed aging, significant changes occur from the accumulation of substances inhibiting growth, metabolic breakdown of reserve substances, proteins and lipids distortion, while abnormal increase germs, reduce germination ability and can be reached in Finally the death of all germs. Seed size expressed usually by 1000 grain weight (MMB) that are directly related, is of particular importance to agricultural practice as compared to the seed medium and especially large, having a higher content of nutrients and better embryo develop, manage to give seedlings a better start, with a higher power to travel with a rooting, growth and better development. The correlation between the indications established through laboratory analyses and field raising represents an important part of the control of the seeds vigour. The raising uniformity was made through the daily counting of the plants raised for three days and was expressed through the percent of the plants raised every day, at those three experimental hybrids from four calibrations of the seed derived from different years of obtaining. Research has been conducted in the experimental field of Jucu Research Station during the years 2007-2008, and  biologic material taken into study was created at SDCA Turda from hybrids that were in production and on perspectivehybrids that were in production and on perspective , namely: Turda 201-trilinear hybrid, semiearly, created at SCDA Turda, group FAO 340, Turda 200 double hybrid, early, registered in 1976, reinscribed in The Official Cataloque in2000 and Turda 165-trilinear hybrid, early, belonging to group FAO 270The obtained results show that the ageing of corn seeds and their caliber may influence the raising rhythm of the plants at the hybrids cultivated through the production conditions, maturation and keeping from the production year until the insemination year.

corn; old; caliber; sunrise

Presentation: oral