IMPACT4SOIL OpenAire LAReferencia - Red Federada de Repositorios Institucionales de Publicaciones Científicas Latinoamericanas UnpayWall DOAJ Scientific Electronic Library Online - Brazil Crossref Microsoft Academic Graph https://periodicos.ufersa.edu.br/caatinga/article/view/4377/pdf https://doi.org/10.1590/1983-21252016v29n405rc Revista Caatinga Open Access 2016-11-05 <p>ABSTRACT Nitrogen (N) is one of the nutrients that have the most significant effect on corn grain productivity increase. In order to evaluate the effect of sources of N topdressing and doses in the grown corn culture, in a conventional till system, it was installed an experiment in the city of Urutaￃﾭ, Goiￃﾡs, in the 2012/13 crop, in clayey textured Red Latosol. The experimental design was a randomized complete block design with four replications, with the treatments arranged in a factorial 3 x 5, consisting of three sources (coated urea, urea and ammonium sulfate) and five doses (0, 60, 120, 180 and 240 kg ha-1) of N, topdressing, applied in the surface and in a single dose, when the corn plants were in V4 stage. The hybrid used was the P3646H. We evaluated the following characters: stem diameter, plant height, height of ear insertion, leaf N, number of ears per plant, ear length, number of rows per ear, number of grains per row, 100 grains mass and grain productivity. All characters have a response to nitrogen fertilization and only the height of ear insertion showed no significant difference between sources. The source coated urea showed the best results, indicating that its use may be compensatory, especially in favorable conditions for the NH3 volatilization, as the application of high doses of N in the surface.</p> 0106 biological sciences Coated urea Adubação nitrogenada S QH301-705.5 Ureia Agriculture Sulfato de amônio 04 agricultural and veterinary sciences Adubação nitrogenada. Sulfato de amônio. Ureia. Ureia revestida. Zea mays L.. 01 natural sciences Nitrogen fertilization Zea mays L. Urea 0401 agriculture, forestry, and fisheries Nitrogen fertilization. Ammonium sulfate. Urea. Coated urea. Zea mays L.. Ammonium sulfate Biology (General) Ureia revestida OLIVEIRA, FERNANDO CASTRO, SOUSA NETTO, MAURILIO DE, ARAUJO, LUCAS DA SILVA, ALMEIDA, ANDRÉ CIRILO DE SOUSA, SILVEIRA, PEDRO MARQUES DA, CUNHA, PAULO CÉSAR RIBEIRO DA, 2016-12-01 journalpaper <p>ABSTRACT Nitrogen (N) is one of the nutrients that have the most significant effect on corn grain productivity increase. In order to evaluate the effect of sources of N topdressing and doses in the grown corn culture, in a conventional till system, it was installed an experiment in the city of Urutaￃﾭ, Goiￃﾡs, in the 2012/13 crop, in clayey textured Red Latosol. The experimental design was a randomized complete block design with four replications, with the treatments arranged in a factorial 3 x 5, consisting of three sources (coated urea, urea and ammonium sulfate) and five doses (0, 60, 120, 180 and 240 kg ha-1) of N, topdressing, applied in the surface and in a single dose, when the corn plants were in V4 stage. The hybrid used was the P3646H. We evaluated the following characters: stem diameter, plant height, height of ear insertion, leaf N, number of ears per plant, ear length, number of rows per ear, number of grains per row, 100 grains mass and grain productivity. All characters have a response to nitrogen fertilization and only the height of ear insertion showed no significant difference between sources. The source coated urea showed the best results, indicating that its use may be compensatory, especially in favorable conditions for the NH3 volatilization, as the application of high doses of N in the surface.</p> Corn Development And Production In Function Of Sources Of Nitrogen Fertilizers And Doses 10.1590/1983-21252016v29n405rc