A posição na encosta e o manejo de um Argissolo afetam a produção de Brachiaria decumbens adubada com N e P?

• Ano de defesa: 2015
• Autor(a) principal: Pessoa, Tiago de Carvalho
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal da Paraíba; Brasil; Solos e Engenharia Rural; Programa de Pós-Graduação em Ciência do Solo; UFPB
• Palavras-chave em Português: Urochloa decumbens; Relevo ondulado; Adubação mineral; Produção de forragem; CNPQ::CIENCIAS AGRARIAS::AGRONOMIA::CIENCIA DO SOLO
• Link de acesso: https://repositorio.ufpb.br/jspui/handle/123456789/15525

Forage production in pasture from the Agreste Paraiba is limited due to the low level from the pasture management, absence of fertilization and of intercropping with leguminous. Besides, the little control from weigh animal cause compaction who associated with landform, favors erosion and it displacement from the nutrients. order to study only the effect of fertility on productivity, soil samples were collected (0-15 cm) in three positions (shoulder, backslope and footslope) of two hillside under distinctly managed grassland (managed and unmanaged). Samples of one Red-Yellow alfisol eutrophic were used in an experiment in pots, in protected environment under factorial combination, fertilized with phosphorus (P) (25 kg ha-1 of P), nitrogen (N) (50 kg ha-1 of N), P x N combined (25 kg and 50 kg ha-1 of P and N, respectively) and the control (P0 N0). Each experimental units were the pots, containing 6 kg of soil and four plants from grass Brachiaria decumbens cv. Basilisk. To the 60 days after emergence, grass was cut to uniformizacion of growth, quantification of dry matter and determination of N and P content. Thereafter, of 40 in 40 days, was made cutting the grass to determination dry matter production of forage and content of N and P. The treatment means were compared by the Tukey test (p<0.05), by statistical models suitable to each condition evaluated. The highest productions and P contents in dry matter were obtained in the combined fertilization between P and N, in all landform positions and pasture management, in the first cut and accumulated in the cuts. The accumulated production was higher in the soil withdrawn from the backslope managed that of unmanaged, the contrary was observed for the production accumulated in the footslope. There was influence of the in landform position and of fertilization under distinct managements of grassland, along the evaluation cuts. Fertilization with N and P in hillside under distinctly managed grassland depends of the position in the hillside. The backslope, replied more to the fertilization with P, while in the footslope the answer is greatest to the N.