Tropical wheat response to irrigation and nitrogen in a Sahelian environment: Grain yield, yield components and water use efficiency
MetadataShow full item record
Every year, increasing areas of irrigated land are being planted to tropical wheat (Triticum aestivum L.) in the Sahel. However, knowledge on how irrigation and nitrogen (N) supply can be simultaneously manipulated to realize maximum yield potential is limited. A 2 year field study was conducted to determine wheat response to differential seasonal irrigation regimes ranging from 300 to 690 mm applied water and 5 N levels of 0, 40, 80, 120, and 160 kg N ha-1. Grain yield and all primary yield components increased linearly in response to irrigation in both seasons. Water use generally increased linearly with increased seasonal irrigation and applied N. A quadratic response in grain yield and kernel number m-2 was observed with increasing N levels in all irrigation regimes both seasons. Grain yield, spikes m-2, kernels spike-1, number of kernels m-2 and kernel weight responses to irrigation were greater at the higher N rates. Spikes m-2 were reduced with water deficit. In both years, the average reduction in number of kernels m-2 at the maximum irrigation deficit was 40.6 and 45% at 0 and 160 kg N ha-1, respectively. Similar reduction occurred in kernels-1 spike, where water deficit decreased this component an average of 21.4 and 31.8% at the lowest and highest N rates, respectively. Water deficit over both years reduced kernel weight by 12 and 19.4% at the lowest and highest N rates. This study showed that optimizing irrigation and N supply in a Sahelian environment can produce economic grain yield, and maximize economic return from wheat production. Nitrogen rate must be matched with the irrigation water available to increase water use efficiency and maximize profits. --Publisher/Author's abstract
Showing items related by title, author, creator and subject.
Lead and Copper Contamination in Potable Water: Impacts of Redox Gradients, Water Age, Water Main Pipe Materials and Temperature Masters, Sheldon Vaughn (Virginia Tech, 2015-05-06)Potable water can become contaminated with lead and copper due to the corrosion of pipes, faucets, and fixtures. The US Environmental Protection Agency Lead and Copper Rule (LCR) is intended to target sampling at high-risk ...
Constantinescu, Ana (Virginia Tech. University Relations, 2008-03-14)World Water Day is celebrated globally on March 22 in an effort to raise awareness about the availability of clean, fresh water, a natural resource that many take for granted.
The Potential for Developing Mine Cavity Water for Water Supplies: Institutional and Water Quality Issues Younos, Tamim M.; Wright, Benjamen A.; Reaves, Dixie Watts, 1963- (Virginia Water Resources Research Center, 1999-08)