Evaluation of green manures in different sowing dates and row-spacings in the Cerrados region

In 1991/1992 growing season, three field experiments were carried out to ev aluate the growth and development of sunn (Crotalaria juncea), Crotalaria o chroleuca, black velvet bean (Mucuna aterrima), pigeon pea cv. Kaki (Cajanu s cajan) as green manures at three sowing dates and two row spacings at Emb rapa-Centro Nacional de Pesquisa de Solos (CNPS), Senador Canedo, GO, Brazi l. The experimental design used was a complete randomized block with split- plot and three replicates. Highest yields of dry matter were obtained with C. juncea and C. cajan. The delay in sowing dates to the beginning of the r ainy season, reduced yield of fresh and dry matter of all legume species, e xcept black velvet bean. Row-spacings of 0,5 and 0,4 cm did not influence t he time for flowering and the yield of fresh and dry matter.