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| DOI：10.13522/j.cnki.ggps.2025345 |
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| Effects of zero-till and conventional tillage on soil water and salinitydynamics and productivity of double-cropping oat systems |
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LI Zhishuang, GAO Xiaoyu, XU Bing, FAN Ting, WANG Guoshuai, TIAN Delong, SONG Chenghao
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1. College of Water Resources and Civil Engineering, Inner Mongolia Agricultural University, Hohhot 010018, China;
2. Institute of Pastoral Hydraulic Research, Ministry of Water Resources, Hohhot 010020, China
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| Abstract: |
| 【Objective】Water scarcity and soil salinization in the arid and semi-arid regions of Northern China significantly constrain forage production and agricultural sustainability. Optimizing tillage and irrigation practices is therefore essential for improving water use efficiency and reducing cultivation costs in forage cropping systems. This study aims to experimentally identify an optimal tillage-irrigation practice for a double-cropping oat system in these regions.【Method】The experiment was conducted in an oat field consisting of zero-till and conventional tillage, with the former irrigated with subsurface drip irrigation (NT-SDI) and the latter with surface drip irrigation (CT-SDI). During the experiment, we measured the soil water content in the 0-100 cm layer and total salt content in the 0-60 cm layer, and the fresh forage yield. We also measured forage quality traits, including crude protein and crude fat content.【Result】Compared with CT-SDI, NT-SDI significantly improved the soil water and salt environment for plant growth, increasing soil water storage in the 0-100 cm layer during the growing period by 18.75%, while reducing total soil salt content in the root zone by 21.5% and 32.6% after the first and second oat harvests, respectively. Compared with CT-SDI, NT-SDI increased plant height by 3.7% in the first season and 18.3% in the second season. It also increased the fresh forage yield to 10.8 t/hm2 and 12.3 t/hm2 in the first and second season, respectively, resulting in a combined annual oat yield increase of 5.5% compared with CT-SDI. In addition, NT-SDI also improved forage quality, with its crude protein and crude fat contents higher than those in CT-SDI in both seasons. In both treatments, crude protein in the second season was 20.5% higher than that in the first season.【Conclusion】The NT-SDI practice effectively improved soil water and salt conditions in both seasons for oat growth, and thus enhances forage yield and quality and reduces cultivation costs. It can be used as an improved cultivation practice for oat production in the arid and semi-arid regions of Northern China. |
| Key words: oat; drip irrigation; no-till; conventional tillage; double cropping; soil moisture; soil salinity |
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