Effects of Buried Straw Strips with Different Internal Structures on Water and Salt Distribution and Leaching Efficiency in Coastal Saline Soil

Umidbek Masharifov, Zhenchang Wang (), Qingxin Li (), Yaosheng Wang, Minghao Tian, Xiaoman Qiang, Jinjing Liu, Yuexiong Wang, Yanwei Fan, Kexin Chen, Sheng Chen and Cheng Hong
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Umidbek Masharifov: College of Agricultural Science and Engineering, Hohai University, Nanjing 210098, China
Zhenchang Wang: College of Agricultural Science and Engineering, Hohai University, Nanjing 210098, China
Qingxin Li: National Center for Efficient Irrigation Engineering and Technology Research-Beijing, Beijing 100048, China
Yaosheng Wang: Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing 100081, China
Minghao Tian: College of Agricultural Science and Engineering, Hohai University, Nanjing 210098, China
Xiaoman Qiang: Key Laboratory of Crop Water Use and Regulation, Farmland Irrigation Research Institute, Chinese Academy of Agricultural Science, Ministry of Agriculture and Rural Affairs, Xinxiang 453003, China
Jinjing Liu: College of Agricultural Science and Engineering, Hohai University, Nanjing 210098, China
Yuexiong Wang: College of Agricultural Science and Engineering, Hohai University, Nanjing 210098, China
Yanwei Fan: College of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou 730050, China
Kexin Chen: College of Agricultural Science and Engineering, Hohai University, Nanjing 210098, China
Sheng Chen: College of Agricultural Science and Engineering, Hohai University, Nanjing 210098, China
Cheng Hong: College of Agricultural Science and Engineering, Hohai University, Nanjing 210098, China

Agriculture, 2024, vol. 14, issue 7, 1-16

Abstract: Straw strip burial in saline soil is an effective method for tideland reclamation in China, but optimal forms of straw strips for regulating soil water and salinity remain unclear. An indoor soil column test investigated the water and salt distribution in soil treated with four different straw forms under freshwater irrigation. The treatments included no straw layer (CK), straw stalks arranged longitudinally (T 5 ), horizontally (T 25 ), longitudinally combined horizontally in layers (T 25+2.5 ), and randomly (T 2.5 ). The results showed that compared to CK, T 25 , T 5 , and T 25+2.5 significantly reduced the infiltration rate of irrigation water, leading to prolonged infiltration times. Wetting front curves under T 5 , T 25+2.5 , and T 25 exhibited similar inverted “V” shapes, while CK and T 2.5 showed fluctuating parallel lines. Water retention in the soil was higher under straw strip treatments (T 5 , T 25 , T 25+2.5 ) and straw layer treatment (T 2.5 ) compared to CK after 24 h of the first irrigation. T 5 demonstrated the most effective salt removal, surpassing other treatments, with a desalination rate of 97.71%. Additionally, T 5 had the highest salt leaching efficiency (SLE) in the 0–20 cm soil layer, recommending it as the optimal form for managing saline soils in crop production due to its simplicity and higher SLE. We found that buried straw strips reduced soil water infiltration rate and wetting front propulsion speed, increased soil water content and enhanced salt leaching efficiency in the saline soil. Our findings provide a basis for developing strategies that improve soil quality and irrigation efficiency, mitigate the effects of salinity on crop production, and ensure food security for a rapidly growing global population.

Keywords: straw forms; soil salinity; wetting front; water and salt content; desalination (search for similar items in EconPapers)
JEL-codes: Q1 Q10 Q11 Q12 Q13 Q14 Q15 Q16 Q17 Q18 (search for similar items in EconPapers)
Date: 2024
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