Produção Nacional
Revisado por pares
Corn Hybrids Response to Nitrogen Rates at Multiple Locations in Brazilian Amazon
2018; Canadian Center of Science and Education; Volume: 10; Issue: 12 Linguagem: Inglês
10.5539/jas.v10n12p233
ISSN1916-9760
AutoresRicardo Shigueru Okumura, Francisco Fábio Albuquerque Mota, Yweenns T. Ferraz, Daiane de Cinque Mariano, Cândido Ferreira de Oliveira Neto, Ismael de Jesus Matos Viégas, André Luís Macedo Vieira, Ana Ecídia de Araújo Brito, Antônio Augusto Nogueira Franco, Augusto José Silva Pedroso,
Tópico(s)Soil Management and Crop Yield
ResumoAmong the nutritional requirements of corn crop, nitrogen (N) is the element required in greater quantity and, directly responsible for increase or decrease in grain production. The aims of study were to evaluate the effects of applied N rates in topdressing in development and production of corn in Brazilian Amazon. The experiments were installed on 20 January 2014 (Capitão Poço city) and 24 January 2014 (Paragominas city). The experimental design was a randomized block design in a 5 × 2 factorial scheme, consisting of five N rates of topdressing applications (0; 40; 80; 120; and 160 kg ha-1 of N) and two corn double hybrids (AL-Avaré; and AL-Bandeirante), with four replicates. The evaluations of vegetative development components (plant height, height of ear insertion, and leaf area index) were carried out at time of male flowering stage, while evaluations of grain yield components (number of grains per row, grain yield, and harvest index) carried out during the harvest period. The corn hybrids, AL-Avaré and AL-Bandeirante, independent of experimental site, showed the highest technical efficiency between the rates of 80 to 120 kg ha-1 of N. Based on the information obtained in regression analysis verified that Paragominas experiment showed greater vegetative development (plant height, LAI, ear height, number of grains per row, ear length) and higher grain yield compared to corn developed in Capitão Poço experiment.
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