Effects of subsurface pipe drainage on soil salinity in saline‐sodic soil under mulched drip irrigation

Abstract

The increasing prevalence of alkali‐saline soil is a major challenge to the sustainable development of agriculture. In this study, a subsurface pipe drainage experiment using different pipe spacing (10, 15, 20 and 25 m) was conducted to reduce soil salinity. The results indicated that the salt content of the 0–80 cm soil layer decreased from 35 to 15 g kg‾¹ after being treated with subsurface pipe drainage. In contrast, the control treatment of ditch drainage had a limited effect on decreasing the soil salinity, the salt content remaining at 25–35 g kg‾¹. In total, 2030 m3 water and 280 t salt were drained during the experiment. Of the subsurface drainage pipe treatments (i.e. spacing at 10, 15, 20 and 25 m) 365, 672, 514 and 479 m3 water were drained, respectively, as well as 66.4, 102, 59.2 and 52.3 t salt, respectively. In addition, the average drainage rate achieved by subsurface drainage pipes was 1.64 m3 h‾¹ and the salt leaching intensity was 46.3 t hm‾2. The optimal pipe spacing for reducing soil salinity was 15 m, with an effective desalination rate reaching 65.8%. At this spacing, the average drainage rate was 2.87 m3 h‾¹ and the salt leaching intensity was 150 t hm‾2. Moreover, the survival rate of cotton at 15 m spacing exceeded 60%. © 2019 John Wiley & Sons, Ltd.

Effects of smashing ridge tillage and spring irrigation combination treatment on water, salinity and cotton yield in drip irrigation cotton fields

“…SO 4 2− and Ca 2+ are affected by the hydration radius, ionic charge and other characteristics, while the soil colloid adsorption capacity is relatively strong, and the spatial migration ability is relatively weak. This is in agreement with Qi et al (2018) and Wang et al (2020a). Previous research reveals that with the exception of CO Cotton emergence rate, yield and economic bene ts…”

“…This method can break the bottom layer of the soil plow, inhibit slabbing, increase porosity, and help the soil retain water and moisture (Wei et al 2017; Wei et al 2020). Moreover, smashing ridge tillage can break the soil "salt return channel" and reduce the soil evaporation of salt return (Yang et al 2020), which improves soil nutrient utilization, promotes root microbial activity, increases soil suction, and increases soil CO 2 content ). Numerous experimental studies have been carried out on smashing ridge tillage in maize (Ren et al 2022;Zhai et al 2017), wheat (Nie et al 2017), rice (Wei 2014) and sugarcane (Duan et al 2022) crops, and all of which demonstrate the ability of smashing ridge tillage to signi cantly improve crop yield and quality.…”

Enhancing quinoa growth under severe saline-alkali stress by phosphate solubilizing microorganism Penicillium funicuiosum P1

“…To reduce the stress of saline-alkali soil for plant, the researchers presented lots of methods, including physical [ 8 ], chemical [ 9 ] and biological methods [ 10 ]. Among of them, physical methods, especially salt washing method, worked best [ 11 ].…”

Determination of Winter Irrigation Quotas for Corn and Oil Sunflower Considering Crop Salt Tolerance Threshold under Subsurface Pipe Drainage Technology

“…When the burial depth is 1.5-2.0 m, increasing the burial depth of subsurface pipes can not only effectively discharge salt from the root layer, but also further reduce groundwater levels and inhibit groundwater evaporation and soil resalinization [17,18]. Many scholars agree that the soil desalination rate above the subsurface pipe increases as the laying distance decreases [19][20][21][22]. However, project cost must be considered to determine the optimal distance [23].…”