Agronomic performance of corn and forages species in Crop-Livestock Integration system in the Cerrado/Desempenho agronomico da cultura do milho e especies forrageiras em sistema de Integracao Lavoura-Pecuaria no Cerrado

The intercropped between cultures lead to competition for production factors such as water, light and nutrients, however currently is common for integrated cultivation of corn for forage recovery and renovation of degraded areas, diversification of the producers income and production of dry matter for no-tillage system. The objective of this work was to evaluate the agronomic performance and nitrogen content of corn intercropped with forage of the genuse Brachiaria and Panicum. The experimental design was a randomized complete block with four repetitions. The experiment consisted of eigth treatments types of corn intercropped with: Panicum maximum cv. 'Tanzania' sowed simultaneously (MTS) or for occasion of the nitrogen fertilization at covering (TCM); Panicum maximum cv. 'Mombaca ' sowed simultaneously (MMS) or for occasion of the nitrogen fertilization at covering (MMC); Brachiaria brizantha cv. 'MG-5 ' sowed simultaneously (MBS) or for occasion of the nitrogen fertilization at covering (MBC); Brachiaria ruziziensis sowed simultaneously (MRS) or for occasion of the nitrogen fertilization at covering (MRC), besides the corn without intercropping (MSC). When the corn reached the V6 stage, proceeded the fertilization at covering with 100kg [ha.sup.-1] N for the 9 treatments. The intercropped of forage of the gen-use Brachiaria and Panicum with corn did not affect the N leaf content, yield components and grain yield in relation to corn cropping. The highest dry matter yields of the forages were in the consortium sown at the occasion of the corn nitrogen fertilization at covering. Key words: Zea mays, Panicum ssp., Brachiaria ssp., no-tillage system. O consorcio entre culturas leva a competicao por fatores de producao como agua, luz e nutrientes, porem, atualmente, e comum o cultivo integrado do milho com forrageiras para recuperacao e renovacao de pastagens degradadas, diversificacao na renda dos produtores e producao de massa seca para sustentabilidade da agricultura. O objetivo deste trabalho foi avaliar o desempenho agronomico e o teor de nitrogenio da cultura do milho consorciado com forrageiras dos generos Panicum e Brachiaria. O delineamento experimental foi o de blocos casualizados, com quatro repeticoes. O experimento foi constituido de oito tipos de consorcio do milho com: Panicum maximum cv 'Tanzania ' semeado simultaneamente (MTS) ou por ocasiao da adubacao nitrogenada de cobertura do milho (MTC); Panicum maximum cv. 'Mombaca', semeado simultaneam