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Subsoiling depth affects the morphological and physiological traits of roots in film-mulched and drip-irrigated cotton

文献类型： 外文期刊

作者： Guo, Rensong 1 ; Zhang, Na 1 ; Wang, Liang 1 ; Lin, Tao 1 ; Zheng, Zipiao 1 ; Cui, Jianping 1 ; Tian, Liwen 1 ;

作者机构： 1.Xinjiang Acad Agr Sci, Inst Econ Crops, Urumqi, Xinjiang, Peoples R China

关键词： Endogenous hormones; Enzyme activity; Gossypium hirsutum; Oasis agriculture; Root; shoot ratio; Root length density

期刊名称：SOIL & TILLAGE RESEARCH （ 影响因子：6.5； 五年影响因子：7.3 ）

ISSN： 0167-1987

年卷期： 2023 年 234 卷

页码：

收录情况： SCI

摘要： Subsoil compaction is increasingly a problem. Subsoiling breaks up the soil, removes compaction, and improves root growth. However, it is unclear whether subsoiling depth affects root growth and physiological functioning of film-mulched and drip-irrigated cotton, which has a shallow root system (< 60 cm). A 2-year experiment (2019-2020) was performed under field conditions (soil texture was sandy loam from 0 to 40 cm and clay loam from 40 to 60 cm) to determine the morphological and physiological traits of the root system at different subsoiling depths: no subsoiling (NS, control) and subsoiling to 30 (S30), 40 (S40), and 50 (S50) cm. The root/shoot ratios were significantly higher for the S30 and S40 treatments than for the control (p < 0.05). The dry matter levels over the 2 years were 24.2% higher in S40 plants than in controls and 20.7% higher than in the others subsoiling treatments. The average 2-year yields (676.9 g m-2) were 24.3%, 11.9%, and 1.4% higher in S40 plants than in controls, S30, and S50 plants. At different soil depths of 0-60 cm, the average 2-year root length density (RLD) of all subsoiling treatments was 0.5 cm cm-3 in the top 20 cm of soil, 14.0% higher than that from 20 to 40 cm and 344.2% higher than that from 40 to 60 cm. However, RLDs of the NS and S30 treatments were highest at 0-20 cm, while S40 and S50 maximum RLDs were in the 20-40 cm layers. The RLD, average diameter of roots, and surface area density of roots were significantly higher in the S40 and S50 treatments than in the S30 and NS treatments (p < 0.05). Compared to NS, subsoiling reduced the levels of malondialdehyde and abscisic acid in roots; improved superoxide dismutase, peroxidase, and catalase activities in roots, and increased the levels of gibberellic acid and indole-3-acetic acid in roots. Our results provide evidence that could help optimize subsoiling depth in film mulching and drip-irrigated cotton in Xinjiang.

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