Forty-two years of no-tillage and cover cropping improved soil oxygen availability and resilience

IF 2.3 4区农林科学 Q1 AGRICULTURE, MULTIDISCIPLINARY

Agricultural & Environmental Letters Pub Date : 2024-06-19 DOI:10.1002/ael2.20135

Facundo Lussich, Jashanjeet Kaur Dhaliwal, Wesley Wright, Debasish Saha

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引用次数: 0

Abstract

Healthy soil air–water balance is critical for crop growth. Conservation agricultural practices improve soil physical properties to influence soil oxygen availability. We evaluated the impact of 42 years of hairy vetch (HV) cover cropping (CC), and no-tillage (NT) on soil oxygen dynamics during a cotton growing season experiencing multiple intensive rain events in silt loam soil. The HV and NT treatments exhibited higher growing season soil oxygen availability (p < 0.05) and experienced three to four times fewer hours of oxygen limitation (i.e., oxygen concentration <10%) as compared to no cover crop (NC) and conventional tillage (CT) treatments. After a heavy rainfall, NT–HV treatment exhibited the highest soil oxygen availability, followed by NT–NC, CT–HV, and CT–NC treatments (p < 0.05). While CC and/or NT treatments quickly regained soil oxygen status within 24 h after saturating rain events, CT–NC suffered from sub-optimal soil aeration until the third day after rainfall cessation. The combination of CC with NT practices enhanced soil oxygen availability and resilience to extreme precipitation events.

Core Ideas

Long-term cover cropping and no-tillage practices enhanced soil oxygen availability following extreme precipitation events.
Cover cropping and no-tillage practices reduced the duration of anoxia experienced by cotton crops during the growing season by three- to four-fold.
Combined cover cropping and no-tillage implementation exhibited the most significant impact in mitigating immediate soil oxygen stress after heavy rainfall events.

Abstract Image

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42 年的免耕和覆盖种植改善了土壤的氧气供应和韧性

健康的土壤气水平衡对作物生长至关重要。保护性农业措施可以改善土壤的物理特性，从而影响土壤氧气的供应。我们评估了在淤泥质壤土中棉花生长季经历多次强降雨事件期间，42 年的毛绒草（HV）覆盖种植（CC）和免耕（NT）对土壤氧气动态的影响。与无覆盖作物（NC）和传统耕作（CT）处理相比，HV 和 NT 处理的生长季土壤供氧量更高（p < 0.05），氧气受限时间（即氧气浓度 <10%）减少了三到四倍。暴雨过后，NT-HV 处理的土壤供氧量最高，其次是 NT-NC、CT-HV 和 CT-NC 处理（p <0.05）。CC和/或NT处理在饱和降雨后24小时内迅速恢复了土壤氧气状况，而CT-NC直到降雨停止后第三天土壤通气状况仍未达到最佳。CC与NT相结合的做法提高了土壤氧气的可用性和对极端降水事件的适应能力。核心观点长期覆盖种植和免耕措施提高了极端降水事件后土壤的氧气供应。覆盖种植和免耕措施将棉花作物在生长季节的缺氧期缩短了三至四倍。覆盖种植和免耕相结合的做法在减轻暴雨事件后的直接土壤氧气压力方面具有最显著的影响。

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来源期刊

Agricultural & Environmental Letters Multiple-

CiteScore

3.70

自引率

3.80%

发文量