Search National Agricultural Library Digital Collections
Back to Search
NALDC Record Details:
Nitrogen fertilization effect on dryland soil water balance and winter wheat yield in the Chinese Loess Plateau
Download [PDF File]
Long-term N fertilization may increase dryland winter wheat (Triticum aestivum L.) yield but also result in adverse eff ects, e.g., soil acidity development and water storage or increased N leaching. Th is study examined if long-term N fertilization affected the soil water balance and dryland winter wheat yield. We evaluated the effect of five N fertilization rates (0, 45, 90, 135, and 180 kg N ha–1) on the soil water balance, precipitation-storage effi ciency (PSE), winter wheat yield, and water-use efficiency (WUE) from 2005 to 2010 in an experiment initiated in 1984 in a Heilutu silt loam in the Loess Plateau of China. Soil water contents at wheat planting and harvest were lower with N fertilization than without. Nitrogen fertilization increased soil water storage during the fallow period (SWSF) from 19 to 22%, water uptake during the growing season from 21 to 25%, PSE from 19 to 22%, and evapotranspiration from 7 to 8% compared to no N fertilization. Increased N rate enhanced soil organic C but had no impact on soil pH in 2005. Wheat yield increased up to 244% and WUE to 220% as the N rate increased. Although more soil water was depleted, N fertilization increased winter wheat yield and WUE by enhancing SWSF and PSE, and increased the water holding capacity by increasing soil organic matter compared to no N fertilization. Long-term N fertilization can increase winter wheat yield by utilizing soil water more efficiently, with minimum impact on soil acidity, in the Chinese Loess Plateau.
Upendra M. Sainju
USDA Scientist Submission
Agronomy journal 2012 12 4 v.105 no.1
American Society of Agronomy
Journal Articles, USDA Authors, Peer-Reviewed
Works produced by employees of the U.S. Government as part of their official duties are not copyrighted within the U.S. The content of this document is not copyrighted.
Agricultural Research Service
Web Policies and Important Links