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| DOI：10.13522/j.cnki.ggps.2021114 |
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| Irrigation Affects the Translocation of Cations from Soil to Maize Roots in Saline-alkaline Soil |
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WANG Hang, ZHOU Qingyun, ZHANG Baozhong, et al
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1. College of Water Conservancy Engineering, Tianjin Agricultural University, Tianjin 300392, China;
2. State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin, China Institute of Water Resources and Hydropower Research, Beijing 100083, China; 3. Sino-US International Joint Research Center for
Ecological Agriculture and Water Environment Protection, Tianjin 300392, China
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| Abstract: |
| 【Background and objective】Soil salinity is an abiotic stress hindering agricultural production worldwide, especially in coastal areas where the groundwater is usually shallow. The aim of this paper is to study experimentally how irrigation affects translocation of major cations from soil to the roots of maize in saline-alkaline soils.【Method】The experiments were conducted at a maize field in a coastal saline-alkali region. We compared four irrigation methods: conventional drip irrigation with irrigation amounts of 10 mm (LI10) and 20 mm (LI20) respectively, and mulched drip irritation with the same irrigation amounts (FI10 and FI20). In each treatment, we measured the changes in K+, Ca2+ and Na+ in both the rhizosphere and roots, from which we derived regression models to analyze how the irrigation method and irrigation amount modulated the cations contents in soil and their translocation to the maize roots.【Result】Mulched drip irrigation reduced Na+ content in the rhizosphere more significantly than the conventional drip irrigation. Increasing irrigation amount in the mulched drip irrigation increased K+/Na+ content in the maize stem in the whole growth season, but only increased their content in the leaves at early growth stage. Conventional drip irrigation affected the relationship between the concentrations of K+/Na+ and Ca2+ in the rhizosphere and the K+/Na+ content in the roots more than the mulched drip irrigation. The increase in Ca2+ in the rhizosphere due to irrigation was likely to have made K+/Na+ less mobile in soil, thereby reducing their translocation from soil to roots and benefiting the crop growth as a result.【Conclusion】Drip-irrigating maize in coastal saline-alkali soil can effectively improve the translocation of cations from soil to crop roots, especially the mulched drip irrigation, thereby ameliorating salinity stress to the crop. It can thus be used as an improved irrigation technology for crop production in such regions. |
| Key words: coastal saline soil; drip irrigation; cation translocation; mulching; maize |
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