Stocking Rate and Nitrogen Fertilization Affect Root Decomposition of Elephantgrass
作者： Hiran Marcelo Siqueira da Silva , José Carlos Batista Dubeux , Maria Lúcia Silveira , Erinaldo Viana de Freitas , Mércia Virginia Ferreira dos Santos
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摘要: Roots are an important component controlling grassland sustainability. They can act as a C sink of atmospheric CO 2 and supply essential nutrients for plant growth. Pasture management strategies intended to increase forage animal production also affect root biomass, composition, decomposition. This 2-yr study evaluated the effects N fertilization stocking rate (SR) on decomposition chemical composition grazed elephantgrass (Pennisetum purpureum Schum. ‘381’) pastures. Treatments consisted factorial combination three SR (2.0, 3.9, 5.8 unit [AU] ha –1 , 1 AU = 450 kg body weight) levels (0, 150, 300 yr ). Greater turnover rates were observed in Year (k 0.00215 g d ) than 0.00178 Increasing increased linearly (P 0.05) at 0 ; nevertheless, when was applied decreased 0.003). Nitrogen reduced ratio acid detergent insoluble nitrogen (ADIN) concentrations 1, but no 2. Root disappearance followed negative single exponential model with increasing fertilization. practices such grazing alter quality turnover; thus, development manage belowground is key long-term
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