Grain yield and nitrogen use efficiency of two maize (zea mays l.) varieties as affected by time of nitrogen application
2008
Salih, M.A, Agricultural Research Corporation, Wad Medani (Sudan) | Ali, E.S., Agricultural Research Corporation, Wad Medani (Sudan) | Babiker, E.A., Agricultural Research Corporation, Wad Medani (Sudan) | Ali, N.A., Agricultural Research Corporation, Wad Medani (Sudan)
Interventions to increase grain yield and nitrogen use efficiency (NUE) could be accomplished through the use of improved hybrids/varieties technologies as well as the best fertilization practices. In this context, a field experiment laid out in split plot design was conducted at the Gezira Research Station Farm for 3 seasons (2004, 2005 and 2006). The objective was to examine the performance of two maize (Zea mays L.) varieties , a hybrid (H -351) and an open pollinated variety (Mugtama - 45), used as a main plot under 6 N application times in addition to a control (0N), used as a sub plot. The result showed that the application of 86 kg Nha-1 at sowing or in two equal split doses (43 kg Nha-1) at sowing and at 3 weeks after emergence gave the highest grain yield, N uptake, N recovery in the grains and NUE followed by when the whole N dose was applied at 3 weeks after emergence. The percent increase in maize grain yield in these treatments over the control, were 140, 131 and 123 % with corresponding % N uptake increase of 172, 150 and 138 respectively. Similar patterns of response were also found in the number of kernels/ row and in the kernels weight. The hybrid H - 351 was significantly superior compared to Mugtama - 45 in the grain yield, N uptake, N recovery and NUE. On average and across all time of N application treatments, H - 351 out yielded Mugtama - 45 by 20%
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