干旱区生态环境知识资源中心(Arid): Managing salinity for sustainable agricultural production in salt-affected soils of irrigated drylands

Arid

DOI	10.1016/j.agsy.2022.103390
	Managing salinity for sustainable agricultural production in salt-affected soils of irrigated drylands
	Devkota, Krishna Prasad; Devkota, Mina; Rezaei, Meisam; Oosterbaan, Roland
通讯作者	Devkota, KP
来源期刊	AGRICULTURAL SYSTEMS
ISSN	0308-521X
EISSN	1873-2267
出版年	2022
卷号	198
英文摘要	CONTEXT: Declining water quantity and quality and poor land, water, and crop management practices are leading to increasing soil salinity, land degradation, desertification, and threatening the overall sustainability of the crop production system in irrigated drylands. Assessments of salinity dynamics and sustainability indicators under alternative agricultural practices are needed to identify the right combination of practices that improve sustainability while minimizing land and environmental degradation.OBJECTIVE: The objective of this study was to assess the potential of conservation agriculture (CA)-based practices, water-saving irrigation, water quality, and nitrogen (N) fertilizer rates for improving the sustainability of rice-wheat (RWS) and cotton-wheat (CWS) systems in salt-affected irrigated drylands. METHODS: The study included mixed-method approaches of two years of field experiments, soil profile and groundwater salinity simulation using Hydrus-1D model, and multi-criteria trade-off analysis for the holistic assessment of alternative innovations in RWS and CWS. The treatments in experiments were composed of a combination of CA-based practices, water-saving irrigation and N rates. Fourteen sustainability indicators computed from experiments and simulation were compared to evaluate the sustainability of those cropping systems and to reveal the potential of those practices for improving sustainability.RESULTS AND CONCLUSIONS: Compared to the initial conditions, the soil salinity decreased in both cropping systems, while the reduction rate was much higher in RWS than CWS (by 28%). In RWS, the conventional treatment had the lowest salinity level, while in CWS, CA (permeant bed + residue retention) had the lowest. RWS raised the groundwater table by 25% compared to CWS. The long-term scenario analysis with Hydrus-1D demonstrated that, with increased irrigation water salinity and soil evaporation rates, soil profile salinity increases by 78% in RWS and 66% in CWS. RWS had a higher net profit (+81%) and soil organic carbon (SOC) (-15%), but lower water productivity (WP) (-147%), nitrogen, and energy use efficiency (EUE) (-46%) than CWS. The CA-based practices in CWS improved sustainability indicators with higher yield and net profit (+20%), WP (+26%), SOC (+456%), and EUE (36%) with decreased soil salinity than in the conventional system.SIGNIFICANCE: The study attempts to assess the effectiveness of resource conservation technologies such as choice of crop species and cropping systems, and tillage and water and fertilizer management practices for improving sustainability. This study showed the significance of agronomic, soil, and water management practices for minimizing soil salinity. Further, the findings from this study strongly demonstrated the role of CA in sustainable agricultural production particularly under CWS in salt-affected irrigated dryland.
英文关键词	Land degradation Hydrus-1D Soil health Energy use efficiency Economic and environmental sustainability
类型	Article
语种	英语
开放获取类型	Green Published, hybrid
收录类别	SCI-E
WOS记录号	WOS:000792473400005
WOS关键词	ORYZA-SATIVA L. ; WATER-USE ; CONSERVATION AGRICULTURE ; PRODUCTION SYSTEMS ; USE EFFICIENCY ; ARID DRYLANDS ; RICE YIELDS ; MANAGEMENT ; NITROGEN ; WHEAT
WOS类目	Agriculture, Multidisciplinary
WOS研究方向	Agriculture
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/391575
推荐引用方式 GB/T 7714	Devkota, Krishna Prasad,Devkota, Mina,Rezaei, Meisam,et al. Managing salinity for sustainable agricultural production in salt-affected soils of irrigated drylands[J],2022,198.
APA	Devkota, Krishna Prasad,Devkota, Mina,Rezaei, Meisam,&Oosterbaan, Roland.(2022).Managing salinity for sustainable agricultural production in salt-affected soils of irrigated drylands.AGRICULTURAL SYSTEMS,198.
MLA	Devkota, Krishna Prasad,et al."Managing salinity for sustainable agricultural production in salt-affected soils of irrigated drylands".AGRICULTURAL SYSTEMS 198(2022).