Abstract
In Brazil today there are large areas of grassland in some stage of degradation due to inadequate handling, particularly with regard to lack of use of phosphate fertilizer. This study aimed to evaluate the productivity and bromatologic composition of three species of tropical forages under the residual effect of phosphorus fertilization. The randomized block design was applied in a 3x5x2 factorial scheme with three forages (Panicum maximum cvs. Tanzania and Mombaca and Brachiaria sp. cv. Mulato), five P rates (0, 40, 80, 120 and 240 kg ha-1), and two cuts (October and November of 2007) with three replicates. The deployment of pasture was held in September 2005, and the area remained under constant grazing and management, with regular cleaning and mowing for two years. In October and November of 2007, the following parameters were evaluated - fresh matter yield (FM), dry matter yield (DM) and contents of crude protein (CP), neutral detergent fiber (NDF), acid detergent fiber (ADF), hemicellulose (HEM) and mineral matter (MM). Phosphorus fertilization until the maximum dose of 240 kg ha-1 did not promote residual effect on yield and chemical composition of Tanzania, Mombaca and Mulato grasses after two years of application in oxisol, with P fertilizer higher than 4.2 mg dm3, whose averages for the accumulation of DM and CP, NDF and ADF were 9.7 Mg ha-1, 11.8%, 77.8% and 41.3%, respectively.
Highlights
The pastures are the basis of production systems of cattle in Brazil (SANTANA et al 2010)
This study aimed to evaluate the accumulation of biomass and bromatologic composition of three species of tropical forages under high the residual effect of phosphate fertilizer
No significant effects were obtained from residual doses of phosphorus in isolated form, the residual doses x cultivars interaction, the residual interaction dose x cuts, as well as the interaction between residual doses x cultivars x cuts for all variables (Table 2)
Summary
The pastures are the basis of production systems of cattle in Brazil (SANTANA et al 2010). The increased use of tropical pastures for ruminant production has been frequently increasing and in order to achieve high productivity, fertilization and maintenance training as well as the choice of good potential for forage production and good nutritional value are essential (QUADROS et al 2002). For this reason, PEDREIRA et al (2014) reported that the grasses of the genus Panicum require soils with intermediary P level fertility for good forage production. According CECATO et al (2007) phosphorus is the most important element for the vigor and plant development, embracing a fundamental role in the establishment and maintenance of pastures
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