Emergência e crescimento de plantas de cobertura em função da profundidade de semeadura

• Autor(a) principal: Pacheco, Leandro Pereira
• Data de Publicação: 2009
• Outros Autores: Pires, Fábio Ribeiro, Monteiro, Fernando Pereira, Procópio, Sérgio de Oliveira, Assis, Renato Lara de, Silva, Gilson Pereira, Filho, Alberto Cargnelutti, Carmo, Marcos Lima do, Petter, Fabiano André
• Tipo de documento: Artigo
• Idioma: por
• Título da fonte: Repositório Institucional da UFLA
• Texto Completo: http://repositorio.ufla.br/jspui/handle/1/29210
• topic: Plantio direto; Integração lavoura-pecuária; Sobressemeadura; Defasagem na emergência; No-tillage; Integrated system; Overcropping; Delay in the emergence

The objective of this study was evaluated emergence of four cover crops at different seeding depths, in order to use them intercropped and oversown with annual crops. The experiment was installed in a greenhouse, and it was organized as a 5 × 7 factorial combination, with crop of fve cover crops: Pennisetum glaucum var. ADR 300, ADR 500, and BN2, Eleusine coracana (fnger millet), and a cober crop( hybrid sorghum with sudan-grass [Sorghum bicolor x Sorghum sudanese)]; seven cover crops seeding depths: (0 cm without any mulch; 0 cm with a mulch of leaves over the seeds;1; 4; 8; 10; and 15 cm).The cover crops were cropping in vases for 40 days. It was evaluated emergence index, emergence time, plant height, green biomass and dry biomass of the above-ground part, leaf area, root dry biomass and root length density. There was reduction of emergence when cover crops was seeded at zero cm depth with a mulch of leaves, except for the E. coracana, that had a better performance in the oversown. Pearl millets and hybrid S. bicolor x S. sudanense show up some restrictions when used in simultaneous consortium. The 15 cm sowing depth must not be used.