Balanço de nitrogênio em quatro gramíneas do gênero Brachiaria

摘要: A N balance study was performed on four species of Brachiaria :  B. decumbens, humidicola, radicans and  ruziziensis. The plants were grown in ten-litre pots two different soils (a Dark-Red Latosol and Planosol) amended with 15-N labelled ammonium sulphate. Fertilizer treatments without molybdenum (Mo) also imposed. harvested five times over a period 14 months there no significant differences the total accumulation aerial tissue grasses all harvests, although  humidicola accumulated more roots than other species. balances (total final soil + plant material - initial fertilizer) Planosol positive, although not significantly. enrichment of  significantly lower that species, indicating possible input biologically fixed to these percentage values for recovery fertilizer (N recovered by plant) were: 49.5, 53.0, 56.6 58.0 for  radicans, B.decumbens, ruziziensis, respectively. In unplanted 90% lost Planosol, which demonstrated importance presence retention soil.