Optimal Irrigation and N-fertilizer Management for Sustainable Winter Wheat Production in Khorezm, Uzbekistan

Ibragimov, Nazirbay, Djumaniyazova, Yulduz, Ruzimov, Jumanazar, Eshchanov, Ruzumbay, Scheer, Clemens, Kienzler, Kirsten, Lamers, John P. A., & Bekchanov, Maksud (2012) Optimal Irrigation and N-fertilizer Management for Sustainable Winter Wheat Production in Khorezm, Uzbekistan. In Martius, Christopher, Rudenko, Inna, Lamers, John P.A., & Vlek, P.L.G. (Eds.) Cotton, Water, Salts and Soums : Economic and Ecological Restructuring in Khorezm, Uzbekistan. Springer Netherlands, pp. 171-180.

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The efficiency of the nitrogen (N) application rates 0, 120, 180 and 240 kg N ha−1 in combination with low or medium water levels in the cultivation of winter wheat (Triticum aestivum L.) cv. Kupava was studied for the 2005–2006 and 2006–2007 growing seasons in the Khorezm region of Uzbekistan. The results show an impact of the initial soil Nmin (NO3-N + NH4-N) levels measured at wheat seeding on the N fertilizer rates applied. When the Nmin content in the 0–50 cm soil layer was lower than 10 mg kg−1 during wheat seeding in 2005, the N rate of 180 kg ha−1 was found to be the most effective for achieving high grain yields of high quality. With a higher Nmin content of about 30 mg kg−1 as was the case in the 2006 season, 120 kg N ha−1 was determined as being the technical and economical optimum. The temporal course of N2O emissions of winter wheat cultivation for the two water-level studies shows that emissions were strongly influenced by irrigation and N-fertilization. Extremely high emissions were measured immediately after fertilizer application events that were combined with irrigation events. Given the high impact of N-fertilizer and irrigation-water management on N2O emissions, it can be concluded that present N-management practices should be modified to mitigate emissions of N2O and to achieve higher fertilizer use efficiency.

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ID Code: 75071
Item Type: Book Chapter
Keywords: Nitrogen rate, Aral Sea Basin, N2O emissions, Productivity
DOI: 10.1007/978-94-007-1963-7_11
ISBN: 9789400719637
Subjects: Australian and New Zealand Standard Research Classification > EARTH SCIENCES (040000)
Australian and New Zealand Standard Research Classification > AGRICULTURAL AND VETERINARY SCIENCES (070000)
Divisions: Current > Schools > School of Earth, Environmental & Biological Sciences
Current > Institutes > Institute for Future Environments
Deposited On: 15 Aug 2014 03:09
Last Modified: 27 Oct 2015 16:27

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