<abstract xmlns="http://www.w3.org/1999/xhtml">Intermittent irrigation has attracted much attention as a water-saving technology in arid and semi-arid regions. For understanding the effect of intermittent irrigation on water and solute storage varied from irrigation amount per time (<italic>IRA</italic>), irrigation application frequency (<italic>IRAF</italic>), irrigation intervals (<italic>IRI</italic>) and even soil texture (<italic>ST</italic>), intermittent irrigation experiment was carried out in 33 micro-plots in Inner Mongolia, China. The experiment results were used for the calibration and validation of HYDRUS-1D software. Then 3 <italic>ST</italic> (silty clay loam, silty loam, and silty clay), 5 <italic>IRA</italic> (2, 4, 6, 8, and 10 cm), 4 <italic>IRAF</italic> (2, 3, 4, and 5 times) and 4 <italic>IRI</italic> (1, 2, 3, and 4 days) were combined and total 240 scenarios were simulated by HYDRUS-1D. Analysis of variance (ANVOA) of simulated results indicated that <italic>ST, IRA,</italic> and <italic>IRAF</italic> had significant effect on salt and nitrate nitrogen (NO3−-N) storage of 0-40 cm depth soil in intermittent irrigation while only <italic>ST</italic> affected soil water storage obviously. Furthermore, salt leaching percentage (<italic>SLP</italic>) and water use efficiency (<italic>WUE</italic>) of 0-40 cm depth were calculated and statistical prediction models for <italic>SLP</italic> were established based on the ANOVA using multiple regression analysis in each soil texture. Then constraint conditions of soil water storage (around field capacity), salt storage (smaller than 168 mg·cm−2), <italic>WUE</italic> (as large as possible) in 0-40 cm depth and total irrigation water amount (less than 25 cm) were proposed to find out the optimal intermittent irrigation strategies. Before sowing, the optimal irrigation strategy for silty clay loam soil was 6 cm <italic>IRA</italic>, 3 times <italic>IRAF</italic>, and 2 days <italic>IRI</italic> respectively. For silty loam and silty clay soils, <italic>IRA, IRAF</italic>, and <italic>IRI</italic> were 8 cm, 3 times, and 2 days respectively.</abstract>

Intermittent irrigation has attracted much attention as a water-saving technology in arid and semi-arid regions. For understanding the effect of intermittent irrigation on water and solute storage varied from irrigation amount per time (IRA), irrigation application frequency (IRAF), irrigation intervals (IRI) and even soil texture (ST), intermittent irrigation experiment was carried out in 33 micro-plots in Inner Mongolia, China. The experiment results were used for the calibration and validation of HYDRUS-1D software. Then 3 ST (silty clay loam, silty loam, and silty clay), 5 IRA (2, 4, 6, 8, and 10 cm), 4 IRAF (2, 3, 4, and 5 times) and 4 IRI (1, 2, 3, and 4 days) were combined and total 240 scenarios were simulated by HYDRUS-1D. Analysis of variance (ANVOA) of simulated results indicated that ST, IRA, and IRAF had significant effect on salt and nitrate nitrogen (NO3−-N) storage of 0-40 cm depth soil in intermittent irrigation while only ST affected soil water storage obviously. Furthermore, salt leaching percentage (SLP) and water use efficiency (WUE) of 0-40 cm depth were calculated and statistical prediction models for SLP were established based on the ANOVA using multiple regression analysis in each soil texture. Then constraint conditions of soil water storage (around field capacity), salt storage (smaller than 168 mg·cm−2), WUE (as large as possible) in 0-40 cm depth and total irrigation water amount (less than 25 cm) were proposed to find out the optimal intermittent irrigation strategies. Before sowing, the optimal irrigation strategy for silty clay loam soil was 6 cm IRA, 3 times IRAF, and 2 days IRI respectively. For silty loam and silty clay soils, IRA, IRAF, and IRI were 8 cm, 3 times, and 2 days respectively.

Effects of Different Irrigation Strategies on Soil Water, Salt, and Nitrate Nitrogen Transport

State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan 430072, China, phone +8602768774363

Ecological Chemistry and Engineering S

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Intermittent irrigation has attracted much attention as a water-saving technology in arid and semi-arid regions. For understanding the effect of intermittent...

Effects of Different Irrigation Strategies on Soil Water, Salt, and Nitrate Nitrogen Transport

Published Online: Jan 22, 2016

Page range: 589 - 609

DOI: https://doi.org/10.1515/eces-2015-0035

Keywords
intermittent irrigation, HYDRUS-1D, simulation, salt leaching percentage, water use efficiency

© 2015 Chi Xu et al., published by De Gruyter Open

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Effects of Different Irrigation Strategies on Soil Water, Salt, and Nitrate Nitrogen Transport

Published Online: Jan 22, 2016

Page range: 589 - 609

DOI: https://doi.org/10.1515/eces-2015-0035

Keywordsintermittent irrigation, HYDRUS-1D, simulation, salt leaching percentage, water use efficiency

© 2015 Chi Xu et al., published by De Gruyter Open

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Keywords
intermittent irrigation, HYDRUS-1D, simulation, salt leaching percentage, water use efficiency