Culturas antecessoras, doses e fontes de nitrogênio nos componentes de produção do milho

Management and cost of urea application in maize grown in northern Paraná state, Brazil

“…According to Pereira Filho and Cruz (2002), there is a direct relation between growth characteristics and yield. Similar results were obtained by Lourente et al (2007), who observed significant effect of topdressed N rates of 50, 100 and 200 kg ha -¹ on length and diameter of ears. In the same experiment, they also found ears presenting maximum diameter of 46.54 mm and length of 18.12 cm with N rate of 200 kg ha -¹.…”

Produtividade do milho em condições de diferentes manejos do solo e de doses de nitrogênio

“…Avaliando o efeito de doses de N em cobertura (0, 25, 50, 100 e 150 kg ha -1 ), na cultura do milho sob sistema plantio direto, Gomes et al (2007) também verificaram incremento linear no teor de N foliar no florescimento da cultura com o aumento na dose do nutriente. Semelhante aos teores obtidos por Lourente et al (2007), o N foliar variou de 15,92 a 27,71 g kg -1 em razão dos fatores considerados.…”

Effects of nitrogen rates and application time on popcorn

“…In turn, the IAC-125 cultivar showed EL with quadratic adjustment when the N was applied in the V 4 stage, but in the V 8 stage EL responded linearly to the use of N in topdressing applications ( Figure 2e). Gökmen et al (2001) observed that increasing rates of N used in popcorn crops provided the significant increase of the EL, and the highest values of EL were obtained with higher N rates used (250 kg ha -1 ), while Lourente et al (2007) observed a significant effect of N rates on the EL of common corn. However, Biscaro et al (2011) pointed out that EL on common corn was not affected by increased levels of N. Nitrogen topdressing has also provided an increased NGR to the two cultivars of popcorn, and a quadratic regression adjustment has been observed, except for the IAC-125 cultivar when the N was applied at the V 8 stage (Figure 3a and b).…”