Nitrogen use efficiency of some maize hybrids

Author: Hoda Kh. A. El-Mekser 1 and Shimaa A. Badawy 2*
Received 10 January 2015, accepted 27 March 2015.

A two-year field experiment was conducted to study the effect of four rates of nitrogen fertilizer (0, 107, 214 and 321 kg N ha-1) on six maize single crosses (SC 10, SC 125, SC 128, SC 162, SC 166 and SC 168) during 2011 and 2012 seasons. Results revealed that increasing N rates from 0 to 214 kg ha-1 was associated with a significant decrease in number of days to 50% tasseling and silking but increased plant height, ear height and grain yield. Further increase in N rate from 214 to 321 kg ha-1 did not significantly affect these traits. Hybrids SC 10 and SC 128 gave the highest yield. On the other hand, the interaction effect between hybrids and nitrogen was significant for plant height, ear height and grain yield in the second season. Nitrogen use efficiency for yield was higher at N application of 214 compared with 321 kg N ha-1. At 214 kg N ha-1, SC 10 and SC 128 had the highest N use efficiency in 2011, while SC 125 had the lowest N use efficiency. At the highest N rate (321 kg N ha-1) SC 10 had the highest N use efficiency while SC 125 had the lowest N use efficiency in the second season. The increase in nitrogen rates was associated with a gradual decrease in nitrogen recovery (NRc) percent in both seasons. Increase in nitrogen rates was associated with a gradual decrease in partial factor productivity in both seasons.

Journal: Food, Agriculture and Environment (JFAE)
Online ISSN: 1459-0263Year: 2015, Vol. 13, Issue 2, pages 138-142.Publisher: WFL.

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