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Straw incorporation: A more effective coastal saline land reclamation approach to boost sunflower yield than straw mulching or burial

文献类型： 外文期刊

作者： Li, Jingsong 1 ; Li, Jing 1 ; Feng, Xiaohui 1 ; Guo, Kai 1 ; Liu, Xiaojing 1 ; Fan, Fengcui 2 ; Liu, Shengyao 2 ; Jia, Songnan 2 ;

作者机构： 1.Chinese Acad Sci, Key Lab Agr Water Resources, CAS Engn Lab Efficient Utilizat Saline Resources, Ctr Agr Resources Res,Inst Genet & Dev Biol, Shijiazhuang 050021, Peoples R China

2.Hebei Acad Agr & Forestry Sci, Inst Agr Informat & Econ IAIE, Shijiazhuang 050051, Peoples R China

3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China

关键词： Soil salinization; Straw return; Soil aggregate; Soil salt profile; Root distribution

期刊名称：AGRICULTURAL WATER MANAGEMENT （ 影响因子：6.5； 五年影响因子：6.9 ）

ISSN： 0378-3774

年卷期： 2024 年 305 卷

页码：

收录情况： SCI

摘要： In coastal lands, soil salinity greatly impedes crops growth and severely affects the agricultural productivity. Returning the crop straw and residual to soil was considered an important land reclamation method; however, the approach of straw return varied, including mulching (SM), burial (SB), and incorporation (SI). This study aimed to determine which approach was most effective to ameliorate coastal saline land and boost crop yield. Field experiments were conducted under different straw amelioration treatments on dry farming sunflowers (Helianthus annuus Linn.) in Bohai coastal land of Northern China. The results indicated that SM and SB changed the soil salt profile and significantly reduced the topsoil (0-0.2 m) salt content mainly by their direct effects on soil water transport, with little impacts on soil structure changes. Differently, SI significantly increased 21.8 % soil organic carbon and 52.3 % soil mean weight diameter in straw incorporated layer. The improvement on soil aggregates and porosity reduced 24.1-38.9 % of topsoil salt content, by limiting soil salt accumulation and promoting salt leaching. Furthermore, SI significantly boosted the sunflower fine root (d< 1.0 mm) growth and resulted in the highest sunflower yield (4.7 t/ha in 2020 and 4.6 t/ha in 2021) among those straw treatments. Compared to SM and SB, the net revenues of two-years sunflower cultivation under SI were improved by 40.68 % and 31.22 %, respectively. Therefore, it concluded that straw incorporation was more effective to reclaim coastal saline soil than straw mulching or burial. In addition, a back propagation artificial neural network model was developed to predict the dynamic of sunflower yield. This outcome provides an insight into the management of coastal farmland by establishing an easily desalinized and fertile topsoil profile structure.

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