Volume 8 Issue 2
Apr.  2015
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Article Navigation >  Water Science and Engineering  > 2015  >  8(2): 114-120
Meng-hua Xiao, Xiu-jun Hu, Lin-lin Chu. 2015: Experimental study on water-saving and emission-reduction effects of controlled drainage technology. Water Science and Engineering, 8(2): 114-120. doi: 10.1016/j.wse.2015.04.009
Citation: Meng-hua Xiao, Xiu-jun Hu, Lin-lin Chu. 2015: Experimental study on water-saving and emission-reduction effects of controlled drainage technology. Water Science and Engineering, 8(2): 114-120. doi: 10.1016/j.wse.2015.04.009
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Experimental study on water-saving and emission-reduction effects of controlled drainage technology

doi: 10.1016/j.wse.2015.04.009

  • Research Center of Fluid Machinery Engineering and Technology, Jiangsu University, Zhenjiang 212013, PR China

Funds:  This work was supported by the National Natural Science Foundation of China (Grant No. 51409124), the Natural Science Foundation of Jiangsu Province (Grant No. BK20140564), and the Open Foundation of the State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering (Grant No. 2013490711).
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  • Corresponding author: Meng-hua Xiao
  • Received Date: 2014-05-08
  • Rev Recd Date: 2015-01-20
    Abstract
  • Field experiments and laboratory analysis were carried out to determine the effects of controlled drainage (CTD) and conventional drainage (CVD) technologies on drainage volume, concentrations of , , and total phosphorus (TP), nitrogen and phosphorus losses, rice yield, and water utilization efficiency. Results show that CTD technology can effectively reduce drainage times and volume; , , and TP concentrations, from the first to the fourth day after four rainstorms decreased by 28.7% to 46.7%, 37.5% to 47.5%, and 22.7 to 31.2%, respectively, with CTD. These are significantly higher rates of decrease than those observed with CVD. CTD can significantly reduce nitrogen and phosphorus losses in field drainage, compared with CVD; the reduction rates observed in this study were, respectively, 66.72%, 55.56%, and 42.81% for , , and TP. Furthermore, in the CTD mode, the rice yield was cut slightly. In the CVD mode, the water production efficiencies in unit irrigation water quantity, unit field water consumption, and unit evapotranspiration were, respectively, 0.85, 0.48, and 1.22 kg/m3, while in the CTD mode they were 2.91, 0.84, and 1.61 kg/m3—in other words, 3.42, 1.75, and 1.32 times those of CVD. Furthermore, the results of analysis of variance (ANOVA) show that the indicators in both the CVD and CTD modes, including the concentrations of , , and TP, the losses of , , and TP, irrigation water quantity, and water consumption showed extremely significant differences between the modes, but the rice yield showed no significant difference.

     

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