The present work aims to study the general and specific combining capacity of the varieties involved in the crossing according to the complete diallel scheme. The trial undertaken in randomized block with four (4) replications, on mineral nutrition (N24 P 12K 12 low background, N48P24K24 high background) was carried out in the experimental station of the National Institute of Agronomic Research of Brazzaville (IRA) in the Republic of Congo. The following characteristics were taken into account: The mass of the main panicle, the number of spikelets completed on the main panicle, the growth rate of the embryonic stem (coleoptile), the growth rate of the embryonic root, the length of the main panicle and the mass of the main panicle. On the basis of the mass of grains per plant in all the varieties studied, the varieties Liman, VNIIR 7679 have a high general combining capacity. The specific combining capacity is maximum at this point for the following combinations: Liman/ Khazar, VNIIR 7679/ Khazar, Droujny/ Leader. The study carried out made it possible to identify varieties with a high overall combining capacity for a certain number of characteristics.
