RESUMO: Um experimento foi realizado durante os anos de 2009 e 2010 para avaliar os efeitos da palhada de espécies forrageiras do gênero Urochloa e da adubação nitrogenada nos atributos químicos do solo durante duas safras (2009 e 2010) e nos teores foliares nutricionais, leituras ICF, os componentes da produção e produtividade de grãos do feijoeiro de inverno na região de Cerrado de baixa altitude. Os tratamentos foram constituídos da semeadura da cultura do feijão cv. Pérola sobre a palhada de Urochloa brizantha cv. Xaraés e Urochloa ruziziensis, adubadas com N (0, 50, 100, 150 e 200 kg N ha-1) - fonte uréia. O delineamento experimental foi o de blocos casualizados com 4 repetições, em esquema fatorial 2x5. A maior produtividade de massa seca da U. brizantha nos dois anos em avaliação incrementou os teores de nutrientes foliares no feijoeiro. O incremento nutricional, com o aumento das doses de N foi verificado, demonstrando que a palhada produzida pelas espécies forrageiras foi determinante na boa nutrição do feijoeiro de inverno. A produtividade de grãos do feijoeiro foi satisfatória, entretanto, não houve efeito das doses de N e das espécies forrageiras cultivadas em antecessão. As espécies de Urochloa utilizadas aumentaram os teores de MO, Ca e Mg nos dois anos avaliados, efeito este da decomposição e mineralização dos resíduos vegetais, garantindo assim o bom desenvolvimento do feijoeiro. | ABSTRACT: An experiment was conducted during the years 2009 and 2010 to evaluate the effects of Urochloa forage straw and nitrogen fertilization on soil properties, nutritional foliar content, index of foliar chlorophyll (IFC) values, production components, and grains yields of winter bean (Phaseolus vulgaris 'Pérola') in the Cerrado lowlands region of Brazil. The treatments consisted of planting bean crops under straw of Urochloa brizantha 'Xaraés' and Urochloa ruziziensis, fertilized with urea-sourced N (0, 50, 100, 150, and 200 kg N ha-1). The experimental design was randomized blocks with four replications, and a factorial scheme of 2 × 5. The greater yield of U. brizantha dry matter in the two years of evaluation increased bean leaf nutrient levels. The nutritional increase with increasing N application rates showed that the straw produced by the forages had a positive effect on bean nutrition. The grain yield was satisfactory but was not affected by the forage species nor by changes in the N application rates. The Urochloa straw increased the soil organic matter (SOM), Ca, and Mg content in both evaluated years, affected the decomposition and mineralization of organic residues, and ensured the proper development of the bean plants.

An experiment was conducted during the years 2009 and 2010 to evaluate the effects of Urochloa forage straw and nitrogen fertilization on soil properties, nutritional foliar content, index of foliar chlorophyll (IFC) values, production components, and grains yields of winter bean ( Phaseolus vulgaris ‘Pérola’) in the Cerrado lowlands region of Brazil. The treatments consisted of planting bean crops under straw of Urochloa brizantha ‘Xaraés’ and Urochloa ruziziensis, fertilized with urea - sourced N (0, 50, 100, 150, and 200 kg N ha - 1 ). The experimental design was randomized blocks with four replications, and a factorial scheme of 2 × 5. The greater yield of U. brizantha dry matter in the two years of evaluation increased bean leaf nutrient levels. The nutritional increase with increasing N application rates showed that the straw produced by the forages had a positive effect on bean nutrition. The grain yield was satisfactory but was not affected by the forage species nor by changes in the N application rates. The Urochloa straw increased the soil organic matter (SOM), Ca, and Mg content in both evaluated years, affected the decomposition and mineralization of organic residues, and ensured the proper development of the bean plants.