Tropical Grasslands (1985) Volume 19, 171180
TESTING NEW CENTROSEMA GERMPLASM FOR ACID SOILS
R. SCHULTZE-KRAFT and G. KELLER-GREIN
CIAT, Tropical Pastures Program, Apartado Aereo 6713, Cali, Colombia, S.A.
Adaptation of Centrosema to an acid Ultisol (pH 4.1, 89% Al saturation), was assessed using a collection of 133 accessions representing 12 species, in a preliminary evaluation trial conducted at Santander de Quilichao, Colombia. On the basis of vigour ratings over a period of 21 months, the tested germplasm was classified into 7 cluster groups. All accessions of C. angustifolium, C. pascuorum, C. plumieri, C. sagittatum, C. schottii, C. virginianum and some C. brasilianum and C. pubescens accessions, were poorly adapted to the soil at the site. All accessions of C. macrocarpum, C. arenarium and an undescribed species (Centrosema sp.n.), and several C. brasilianum and C. pubescens accessions, grew well. Rhizoctonia foliar blight mainly affected C. brasilianum. Pseudomonas bacterial blight mainly affected Centrosema sp.n. and C. schiedeanum.