DRY MATTER YIELD AND CHEMICAL COMPOSITION OF Desmodium GENOTYPES IN RONDONIA
Keywords:
calcium, crude protein, digestibility, dry matter, magnesium, phosphorus, potassium.Abstract
The agronomic performance of ten Desmodium genotypes was evaluated in a trial carried out at Porto Velho,Rondonia. The experimental design was a radomized complete block with three replications. The following genotypes wereevaluated: five of D. ovalifolium (CIAT-350, CIAT-3666, CIAT-3673, CIAT-3774, and CIAT-3784), four of D. heterophilum(CIAT-349, CIAT-365, CIAT-3782, and CIAT-3791), and one of D. canum (CIAT-3522). During the rainy season, thegenotypes D. ovalifolium CIAT-350, CIAT-3784 and D. canum CIAT-3522 presented higher dry matter (DM) yields. Duringthe dry season, D. ovalifolium CIAT-3673, CIAT-350 and D. canum CIAT-3522 were the most productive genotypes. Thehighest crude protein contents were obtained by the genotypes D. heterophilum CIAT-349 and CIAT-365, which did not differfrom D. ovalifolium CIAT-3673. The genotypes of D. ovalifolium CIAT-3673, CIAT-350, and CIAT-3784 had higher phosphoruscontents. The highest calcium and magnesium contents were provided by D. ovalifolium CIAT-350 and D. heterophilumCIAT-3791, respectively, while higher potassium contents were obtained by D. canum CIAT-3522, D. heterophilum CIAT-3791 and D. ovalifolium CIAT-3774 genotypes. The higher in vitro dry matter digestibility coefficients were provided by D.heterophilum CIAT-3782 (50,3%), CIAT-349 (48,2%) and CIAT-3791 (47,7%). The most promising genotypes to obtainhigher forage yields with.better quality, were D. ovalifolium CIAT-350, CIAT-3673, and D. canum CIAT-3522.
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