Impacts of long-term saline water irrigation on soil properties and crop yields under maize-wheat crop rotation

作者：He Wang, Chunlian Zheng, Songrui Ning, Caiyun Cao, Kejiang Li, Hongkai Dang, Yuqing Wu, Junpeng Zhang · 发表于：Agricultural Water Management · 年份：2023 · DOI：10.1016/j.agwat.2023.108383 · 被引用次数：86 · 研究领域：Rice Cultivation and Yield Improvement、Crop Yield and Soil Fertility

Saline water is widely used as an alternative water resource for agriculture to overcome the freshwater shortage in arid and semiarid regions. But long-term using of the saline water for irrigation would negatively affect soil properties and crop production, and the salinity of the irrigation water should be properly managed to reduce the risks. In this study, saline water with five levels of electrical conductivities (ECiw) at 1.3 (CK), 3.4, 7.1, 10.6, and 14.1 dS·m−1 were used to irrigate winter wheat and summer maize with annual double cropping system in the North China Plain (NCP) from 2006 to 2019, to decide the threshold value for long-term using saline water. Crop yields and soil salinity were continuously examined from 2006 to 2019, and soil physicochemical properties were monitored in 2018 and 2019 after 12 years’ saline water irrigation. Results showed that soil salinity in the 0100 cm layer could be maintained at a low level using saline water with ECiw at 3.4 dS·m−1. Soil salt accumulated in winter wheat seasons could be leached from the main root zone in the following summer maize seasons, which were rainy in this region due to the monsoon climate. No significant difference was observed in grain yields for treatment with ECiw at 3.4 dS·m−1 compared to CK treatment. The electrical conductivity of the saturated soil extract (ECe), soil pH, sodium adsorption ratio, and bulk density within the top soil layer of 030 cm increased with the increase in ECiw, whereas the ...