Eficiência Agronômica da Cultura do Milho Sob Diferentes Fontes de Nitrogênio em Cobertura

Abstract

A produção de milho se destaca no Brasil como o principal cereal cultivado e se torna cada vez mais importante devido ao aumento da demanda de produção de alimentos. A adubação nitrogenada, além de possuir alto custo no cultivo do milho, tem grande influência nos componentes de rendimento da cultura. Pela dinâmica do nitrogênio ser muito dependente das condições climáticas se buscam fontes alternativas para diminuir perdas no sistema. Sendo assim, o objetivo desta pesquisa foi avaliar a eficiência agronômica da cultura do milho, sendo este submetido a diferentes fontes de nitrogênio em cobertura, buscando testar as principais fontes do nutriente disponíveis no mercado. O delineamento experimental utilizado foi de blocos casualizados, com cinco blocos e cinco tratamentos. Foi utilizada a espécie híbrido comercial 30f53 VYHR e os tratamentos consistiram de testemunha, Nitromag, Super N, Cooper N e Ureia. Foram analisadas as variáveis: índice de clorofila foliar, rendimento de grãos e produção de massa verde e seca. Os resultados foram submetidos à análise de variância pelo teste F e as diferenças entre médias foram comparadas pelo teste de Tukey (P≤0,05) de probabilidade de erro. As diferentes fontes de N não diferiram, significativamente, entre si para o índice de clorofila foliar, rendimento de grãos e produtividade de massa verde e seca.

Urease inhibitor on performance of corn hybrids in second crop in Sinop-MT

“…Kappes et al (2009), observed a significant increase in corn productivity with application of 70 kg ha-1 of N, regardless of the source used. Rodrigues et al (2018) found that the application of urea is beneficial for the cultivation of corn even in years of favorable climatic conditions, obtaining gains of 31% in grain productivity in the treatment with urease inhibiting urea, Super N. As well as the climatic conditions , previously mentioned, favored the development of corn in the present experiment. It is also noticeable the high productivity of the control, it should be noted that 40 kg ha-1 of N was applied in the sowing despite not having been covered, and its production is within the average values with application of nitrogen in coverage (RESENDE et al, 2018).…”

Desempenho de híbridos de milho safrinha em função de fontes de ureia na adubação de cobertura

“…The provision of N on side-dress with urea or UREMAX increased the levels of chlorophyll. Rodrigues et al (2018) also verified differences in treatments with or without urea, confirming the precept that N application on side-dress is essential, regardless of the source. Still, according to the authors, despite the higher values with urease inhibitor application, there were no significant differences, a result that is different of what was found in this study, in which the chlorophyll levels showed a higher value with UREMAX application.…”

“…Kappes et al (2009) observed significant increases in grain yield with the application of 70 kg ha -1 of N, regardless of the source used. Rodrigues et al (2018) verified that urea supply is beneficial to the maize even in years of favorable climatic conditions, obtaining gains of 31 % on the yield on the treatment with urea and urease inhibitor, Super N®. As well as the climatic conditions mentioned before favored the maize development in this study, it is also clear the high yield of the witness treatment, for which it should be noted that 40 kg ha -1 of N was applied at sowing, but no side-dress fertilization was carried out, still its yield is in the same average values of the ones with N application on sidedress (RESENDE et al, 2018).…”

Response of the Type of Nitrogen Resource in the Quality of Maize Cultivated in Southern Amazonia

“…The importance of nitrogen to maize is due to its participation in the composition of related amino acids, protein, chlorophyll and many essential enzymes that stimulate the growth and development of the aerial part and its root system (Malavolta, 2006). According to Rodrigues et al (2018), nitrogen is a nutrient that acts in the vegetative development, directly influencing the cell division and expansion and the photosynthetic process of the plant.…”