Biomass accumulation in mombasa guineagrass plants under different levels of nitrogen supply and plant densities

AUTOR(ES)

Pereira, Vinícius Valim, Fonseca, Dilermando Miranda da, Martuscello, Janaina Azevedo, Cecon, Paulo Roberto, Santos, Márcia Vitória, Braz, Thiago Gomes dos Santos

FONTE

Revista Brasileira de Zootecnia

DATA DE PUBLICAÇÃO

2012-05

RESUMO

The objective of this study was to evaluate the effect of different levels of nitrogen supply and plants densities in the productivity of mombasa guineagrass (Panicum maximum) in the period of establishment. The design was of completely randomized blocks, with 12 treatments and three repetitions, with four nitrogen supplies (absence of application, 80, 160 and 320 kg/ha.year) and three plant densities (9, 25 and 49 plants/m²). The plot was cut at 30 cm from the ground when the sward high intercepted 95% of light. The following items were evaluated: sward height at 95% light interception, interval and number of cuts, dry mass production, total dry mass of leaves, stems and dead material and the morphologic composition. Nitrogen increased the dry mass production and the dry mass of stem in winter and summer, and decreased in the fall. The total dry mass of leaf presented decrease of 19% in the summer between the smallest and biggest densities in the 320 kg/ha. The dry mass of dead material had negative effect of the density in the fall. The leaf percentage increased 88% between the smallest and largest nitrogen level at the plant density of 49 plants/m². Only density influenced the sward height in the condition of 95% of light interception. The number of cuts increased with nitrogen levels in the fall, spring and summer, while the interval of cuts decreased with fertilization in the spring and summer. Nitrogen increases the production of mombasa guineagrass in each cycle.

Documentos Relacionados

• Tillering and biomass partitioning of Mombasa grass under nitrogen fertilization during regrowth
• Morphogenesis of Tanzania guinea grass under nitrogen doses and plant densities
• Nitrate Reductase Activity and Nitrogen and Biomass Accumulation in Sugarcane under Molybdenum and Nitrogen Fertilization
• Biomass and nitrogen accumulation in white oat (Avena sativa L.) under water deficit
• Características morfogênicas e estruturais e acúmulo de biomassa do capim-mombaça sob doses de nitrogênio e densidade de plantas