The paper deals with the study of the influence of the seeds calibres, of the sowing depth and of the growth vigour at the main hybrids cultivated in Transylvania. For doing this there were taken 3 depths of sowing 4,6,8 cm from the depth norms, where were sowed the experimental calibres selected from the seeds of the hybrids T-165, T-200 and T-201 in a trifactorial experience placed after the methods of  parcels subdivided in three repetitions. The sowing was made after the optimal period to avoid the influence of the thermal stress on seeds germination and to strictly delimit the relation between the sowing depth, the calibre and the hybrid. The correlation between the indexes established through laboratory analyses and the raising in the field are an important part of the control of the seeds vigour. The correlation between the indexes established through laboratory analyses and the raising in the field are an important part of the control of the seeds vigour. The appreciation of the vigour was made after 7 days from the raising (in the phase of 2 leaves) and in the phase of 11 leaves, being appreciated through marks from 1 to 9, mark 9 being the maxim vigour. Research has been conducted in the experimental field of the territory Jucu Station for Research and Development in 2008 and the biological material taken for study was created at SCDA Turda from hybrids that were in production and in perspective, namely: TURDA 201 - triliniary hybrid, semiearly created at SCDA Turda, group FAO 340, TURDA 200 -hybrid double early, registered in 1976,rewritten in the Official Cataloque in 2000 and TURDA 165 - triliniary hybrid, early belonging to the group FAO 270. The obtained results show us that among the technological factors involved in the raising and the vigour of the corn seeds , the sowing depth at normal intervals of 4, 8cm  has a small influence on the raising vigour, the registered differences remaining at the level of those established for hybrids and calibres.

corrn, calibre, seeding depth, raising, vigour

Presentation: oral