文献类型： 外文期刊
作者： Huang, Shangshu 1 ; Ul Islam, Mahbub 3 ; Jiang, Fahui 1 ;
作者机构： 1.Jiangxi Agr Univ, Coll Land Resources & Environm, Nanchang, Peoples R China
2.Jiangxi Inst Red Soil, Nanchang, Peoples R China
3.Bangladesh Agr Res Inst, Gazipur, Bangladesh
关键词： conventional tillage; random-forest; best tillage depth; tillage management; subsoiling
期刊名称：PLANT SOIL AND ENVIRONMENT （ 影响因子：2.4； 五年影响因子：2.2 ）
ISSN： 1214-1178
年卷期： 2023 年
页码：
收录情况： SCI
摘要： The tillage depth plays a critical role in solving soil compaction -a global problem of soil degradation. However, to date, there are few research reported about tillage depth, and the standard of optimum tillage depth is lacking. Therefore, we conducted a meta-analysis to quantify the effect of tillage depths on crop yield across a global scale, and then to analysis their influence factors such as local climate, soil properties, and managements. Moreover, a global distribution of the optimal tillage depths was estimated by using a random-forest model. Overall, our result demonstrated that crop yield first increased within tillage depths from 25 cm to 35 cm, and then reduced under higher depth of deep tillage compared to conventional tillage, according to 1 109 wheat, maize and soybean (WMS) yield observations from 202 studies and 109 publications. Visibly, 35 cm hence became the optimum tillage depth of WMS across the world, while it varies with different regions. Furthermore, higher crop yields observed in areas with a humid climate, high clay contents, and large bulk density under the optimal depth 40, 35 and 45 cm, respectively. In contrast, a lower yield was observed in areas with arid climates, silty and sandy soils, and lower bulk density within optimal depth of 25, 30 and 25 to 35 cm. Human management efforts, including fertiliser addition, irrigation, straw returning, and changing of cropping system or crop species mostly increased the crop yield under deep tillage. Particularly, our meta-analysis indicated that straw returning needs a greater depth. Finally, we predicted the distributions of optimum depths, which showed that 30 cm and 35 cm were the optimum tillage depths in the temperate and tropical regions, and the total crop yields of global WMS increased by 2 689 million tons per year under the optimal tillage depth, compared with the conventional tillage.
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