Abstract
Monitoring of drinking water has shown an increase in nitrate-nitrogen (NO −3 -N) concentration in groundwater in some areas of the Heihe River Basin, Northwest China. A combination of careful irrigation and nitrogen (N) management is needed to improve N uptake efficiency and to minimize fertilizer N loss. A 2-year experiment investigated the effects of different irrigation and N application rates on soil NO −3 -N distribution and fertilizer N loss, wheat grain yield and N uptake on recently reclaimed sandy farmland. The experiment followed a completely randomized split-plot design, taking flood irrigation (0.6, 0.8 and 1.0 of the estimated evapotranspiration) as main plot treatment and N-supply as split-plot treatment (with five levels of 0, 79, 140, 221, 300 kg N ha−1). Fertilizer N loss was calculated according to N balance equation. Our results showed that, under deficit irrigation conditions, N fertilizer application at a rate of 300 kg ha−1 promoted NO −3 -N concentration in 0–200 cm depth soil profiles, and treatments with 221 kg N ha−1 also increased soil NO −3 -N concentrations only in the surface layers. Fertilizer N rates of 70 and 140 kg ha−1 did not increase NO −3 -N concentration in the 0–200 cm soil profile remaining after the spring wheat growing season. The amount of residual NO −3 -N in soil profiles decreased with the amount of irrigation. Compared with N0, the increases of fertilizer N loss, in N79, N140, N221 and N300 respectively, were 59.9, 104.6, 143.5 and 210.6 kg ha−1 over 2 years. Under these experimental conditions, a N rate of 221 kg ha−1 obtained the highest values of grain yield (2775 kg ha−1), above-ground dry matter (5310 kg ha−1) and plant N uptake (103.8 kg ha−1) over 2 years. The results clearly showed that the relative high grain yield and irrigation water productivity, and relative low N loss were achieved with application of 221 kg N ha−1 and low irrigation, the recommendation should be for those farmers who use the upper range of the recommended 150–400 kg N ha−1, that they can save about 45% of their N and 40% of their irrigation water application.
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Abbreviations
- ANOVA:
-
analysis of variance
- DM:
-
above ground dry matter
- ET:
-
evapotranspiration
- GY:
-
grain yield
- I0.6, I0.8 and I 1.0 :
-
irrigation treatment
- IWP:
-
irrigation water productivity
- N:
-
nitrogen
- N0, N79, N140, N221 and N300 :
-
nitrogen application treatment
- NUE:
-
nitrogen use efficiency
- PFP:
-
partial fertilizer productivity
- WUE:
-
water-use efficiency
- AE:
-
agronomic efficiency
- NF:
-
nitrogen fertilizer recovery fraction
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Acknowledgements
This research was supported by the National Science and Technology Support Plan of China (2007BAD89B17), National Modern Pasture Industry Technology Research System, the National Basic Research Program (973) of China (2009CB421302), CAS/SAFEA International Partnership Program for Creative Research Teams (CXTD-Z2005-2-4) and National Natural Science Foundation (31060178). We thank would like to thank the anonymous reviewers for many helpful comments on earlier versions of this manuscript.
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Wang, Q., Li, F., Zhao, L. et al. Effects of irrigation and nitrogen application rates on nitrate nitrogen distribution and fertilizer nitrogen loss, wheat yield and nitrogen uptake on a recently reclaimed sandy farmland. Plant Soil 337, 325–339 (2010). https://doi.org/10.1007/s11104-010-0530-z
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DOI: https://doi.org/10.1007/s11104-010-0530-z