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Effect of Different Thresholds of Drip Irrigation Using Saline Water on Soil Salt Transportation and Maize Yield

1, 2,3,*, 1,4,*, 5 and 6
1
College of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing 210098, China
2
Water Conservancy and Civil Engineering College, Inner Mongolia Agricultural University, Hohhot 010018, China
3
Cold and Arid Regions Irrigation and Drainage Research Institute, Inner Mongolia Agricultural University, Hohhot 010018, China
4
College of Agricultural Engineering, Hohai University, Nanjing 210098, China
5
Water Conservancy Science Research Institute of Bayannaoer, Linhe 015000, China
6
Nanjing Hydraulic Research Institute, Nanjing 210029, China
*
Authors to whom correspondence should be addressed.
Water 2018, 10(12), 1855; https://doi.org/10.3390/w10121855
Received: 11 November 2018 / Revised: 4 December 2018 / Accepted: 5 December 2018 / Published: 14 December 2018
(This article belongs to the Section Water Use and Scarcity)
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Abstract

Sustainable development of saline water irrigation was restricted in HID (Hetao Irrigation District) by serious yield reduction and severe salt accumulation without an effective irrigation schedule. Field experiments were carried out to study the effects of drip irrigation thresholds on soil salt transportation and maize yield with shallow saline ground water in 2015 and 2016 in HID. The irrigation was triggered by four soil matric potential (SMP) treatments which measured 20 cm beneath the drip emitter. Results indicate that the shape of the wetting body approximated a one-fourth ellipse on the vertical profile perpendicular to the drip line, while the horizontal radius increased with the increase of SMP. Moreover, salt accumulation decreased with the increasing thresholds in the 0–40-cm layer, while the soil salt in the 40–100 cm layer was hardly affected by SMP thresholds under a drip irrigation quota of 22.5 mm. Maize yield showed a quadratic relationship with the SMP threshold, and the irrigation water use efficiency (IWUE) showed a linear increase in response to the decrease in SMP threshold. Taking into account the salt accumulation, yield and IWUE, a SMP threshold higher than −30 kPa is suggested as the appropriate indicator for maize mulched-drip irrigation with shallow saline groundwater in HID. View Full-Text
Keywords: shallow saline groundwater; drip irrigation; maize; salt transportation; salt accumulation shallow saline groundwater; drip irrigation; maize; salt transportation; salt accumulation
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Li, J.; Qu, Z.; Chen, J.; Wang, F.; Jin, Q. Effect of Different Thresholds of Drip Irrigation Using Saline Water on Soil Salt Transportation and Maize Yield. Water 2018, 10, 1855.

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