Mineral and organomineral sources of nitrogen to maize agronomic performance
Keywords:Zea mays L., Fertilizer technology, Grain yield, Urea, Organomineral
Nitrogen (N) is one of the nutrients absorbed in great quantity by maize crop. Also, N fertilizers are of high costs and subject to large losses into the agricultural environment. There are various categories of fertilizers known as fertilizers of improved efficiency that can minimize such N losses. The objective of this study was to evaluate the effect of different sources and doses of N in maize agronomic performance. The experiment was installed in randomized blocks, with four replications, designed as a factorial 5 x 5 + 1, constituted by five N sources (urea, urea polymerized, urea with NBPT, organomineral with and without NBPT), five N doses (40, 80, 120, 160, 200 kg ha-1) plus a control (no N supply). The chlorophyll contents and grain yield were evaluated. The results showed no differences for the different N sources, indicating that the organomineral sources are as efficient as the mineral sources. The addition of N fertilizers in increasing doses, regardless of the source tested, has increased the levels of chlorophylls and grain yiled.
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Copyright (c) 2020 Marcelo Alves da Rocha Dias, Regina Maria Quintão Lana, José Geraldo Mageste da Silva, Odair José Marques, Adriane de Andrade Silva, Ernane Miranda Lemes, Daniel Martins da Silva, Jéssica Mieko Ota Alves
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