Interferência de plantas daninhas no estabelecimento de Urochloa ruziziensis

Abstract

It had aimed to study the relationship of interference of weeds about the morphogenesis, productivity and greenhouse gases production of Urochloa ruziziensis. The research was installed at Mato Grosso Federal University, Barra do Garças County. The experimental design was randomized block, four replication and seven levels of coexistence period that are 0, 15, 30, 45, 60, 75 and 90 days. Analyses were done to morphological parameters: tiller number, leaves number, green leaf biomass, green stein biomass, dry leaf blade biomass and dry stein biomass. After to have the biomass, it were calculated the green dry matter and dead dry matter availability corresponding to each period and it percentage participation in the total grass availability. Also, it was done analyses in vitro of greenhouse gases methane (CH4) and carbon dioxide (CO2). Variance analyses were done in the results to 5% and mean tests by Scott-Knott to 5%. The biomass production, CH4 and CO2 of U. ruziziensis were modify with only 15 days of coexistence with weeds having bigger effect after 45 days. It concludes that weeds interfere in the all morphological parameters, productivity and greenhouse gases production of U. ruziziensis.