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Responses of Panicum maximmum cv. Tanzania to fertilization rates and cutting heights associations

Grant number: 08/03348-0
Support type:Scholarships in Brazil - Master
Effective date (Start): November 01, 2009
Effective date (End): September 30, 2010
Field of knowledge:Agronomical Sciences - Animal Husbandry
Principal Investigator:Moacyr Corsi
Grantee:Pedro Castro de Almeida
Home Institution: Escola Superior de Agricultura Luiz de Queiroz (ESALQ). Universidade de São Paulo (USP). Piracicaba , SP, Brazil

Abstract

The sustainability of production systems depends on its ability in generating financial incomes for the producer, steadily over the years, promoting economic return from investments without incurring in deterioration of production environments. However, most of Brazilian pastures are under degradation or presents limited capacity to generate financial incomes due to inappropriate technology use. Grazing and soil fertilization management are critical points of this process. Nutrients cycle in grasslands involves nutrient extraction from the soil, within plant remobilization, nutrient recycling through litter decomposition and redistribution through animal excreta. Increases in defoliation severity and forage utilization can lead to increases in relative importance of recycling through animal excreta, which are subject to greater losses by leaching and volatilization, and to reductions in relative importance of remobilization, with greater proportion of nutrients being supplied by the soil. This process points to an interaction between plants cutting height and soil fertilization, affecting productivity of grazed swards. This experiment aims to investigate the association between fertilization and defoliation intensity by combining two fertilization levels (zero and 400 kg N / ha / year), and three cutting heights (20, 30 and 50 cm). Cutting is going to be done by beef cattle in a Mob Grazing experiment model, every time that light interception (LI) by the canopy achieves 95%. IT is intended to be evaluated: nutrient extraction by plants, forage total accumulation, forage accumulation rates, forage losses and grazing efficiency. Besides that, it is intended to examine the LI x Sward height and LI x tillering relationships, and to describe forage accumulation process.

Academic Publications
(References retrieved automatically from State of São Paulo Research Institutions)
ALMEIDA, Pedro Castro de. Respostas de Panicum maximum cv. Tanzânia à associações entre adubação e severidade de desfolha. 2011. Master's Dissertation - Universidade de São Paulo (USP). Escola Superior de Agricultura Luiz de Queiroz Piracicaba.

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