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Effect of irrigation and nitrogen on water use efficiency of wheat in Saudi Arabia

"Water use efficiency (WUE) and yield of wheat were determined in a field experiment using different irrigation waters, with and without nitrogen fertilizer on a sandy to loamy sand soil during 1991–1992 and 1992–1993. Depending upon different fertilizer treatments, the mean crop yield ranges in 1992–1993 were: biomass 4290–13 960 kg ha−1 (well water) and 6460–14 870 kg ha−1 (aquaculture effluent) and grain yield 770–5010 kg ha−1 (well water) and 2140–5790 kg ha−1 (aquaculture effluent). The WUE for grain yield in 1991–1992 was 2.67–12.24 kg ha−1 mm−1 (well water) and 4.29–12.67 kg ha−1 mm−1 (aquaculture effluent). The WUE for grain yield in 1992–1993 was 1.22–7.97 kg ha−1 mm−1 (well water) and 3.40–9.21 kg ha−1 mm−1 (aquaculture effluent). The WUE for biomass in 1991–1992 ranged between 8.74–29.16 kg−1 ha−1 mm−1 (well water) and 11.34–30.02 kg ha−1 mm−1 (aquaculture effluent). Whereas in 1992–1993, the WUE for biomass was 6.82–22.19 kg ha−1 mm−1 (well water) and 8.68–23.64 kg ha−1 mm−1 (aquaculture effluent). The grain yield and WUE obtained in T4 and T5 irrigated with well water and receiving 75 and 100% nitrogen requirements, were comparable with T4 and T5 irrigated with aquaculture effluent and receiving 25 and 50% nitrogen requirements. It is, therefore, concluded that application of 150–225 kg N ha−1 for well water irrigation and 75–150 kg N ha−1 for aquaculture effluent irrigation containing 40 mg N 1−1 would be sufficient to obtain optimum grain yield and higher WUE of wheat in Saudi Arabia."
Ghulam Hussain, Ali A. Al-Jaloud
Research Institute of Natural Resources and Environment, King Abdulaziz City for Science and Technology
Industry Focus: 
Food & Agriculture
Saudi Arabia
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