Ciclagem e liberação de nitrogênio por plantas de cobertura na cultura do milho em segunda safra12

• Autor(a) principal: SILVA, Maycon Schwarzbach da
• Data de Publicação: 2016
• Tipo de documento: Trabalho de conclusão de curso
• Idioma: por
• Título da fonte: Biblioteca Digital de Monografias da UFMT
• Texto Completo: http://bdm.ufmt.br/handle/1/703
• topic: CNPQ::CIENCIAS AGRARIAS::AGRONOMIA; Produção de fitomassa; Urochloa brizantha; Nitrogênio; Biomass production; Urochloa brizantha; Nitrogen

Agriculture has continuously demanded high rates of nitrogen fertilization, essential in order to obtain high yields in grain production. Thus, it is important the application of management practices, that provide a better usage of fertilizer and hence the reduction in the use of nitrogenous fertilizers. On this regard, the use of cover crops has shown to be a promising practice in nitrogen cycling for subsequent crops. So, the aim of this study was to evaluate and quantify the production of biomass, decomposition and nitrogen release of different cover crops in Second Harvest corn in dystrophic Yellow Latosol in Sinop, MT. It had been used a randomized complete block design and a Split Plot System, in a factorial scheme (5x9), consisting of five cover crops in the main parcel and nine periods of evaluation in the subplots with four repetitions. The cover crops under tests were: Pennisetum glaucum, Crotalaria spectabilis, Urochloa brizantha, Eleusine coracana (L.) Gaertn and Mucuna pruriens. The evaluation of the remaining nutrients in the biomass was performed at 0, 15, 30, 45, 60, 90, 120, 150 and 180 days after the desiccation of cover crops. Urochloa brizantha and Pennisetum glaucum stood out in biomass production, accumulation and release of nitrogen. The largest corn yield was observed with cultivation on straw of Urochloa brizantha, a species of great potential, recommended for the production of biomass and Nitrogen cycling in Amazon biome.