干旱区生态环境知识资源中心(Arid): Supplemental Irrigation with Brackish Water Improves Carbon Assimilation and Water Use Efficiency in Maize under Tropical Dryland Conditions

Arid

DOI	10.3390/agriculture12040544
	Supplemental Irrigation with Brackish Water Improves Carbon Assimilation and Water Use Efficiency in Maize under Tropical Dryland Conditions
	Cavalcante, Eduardo Santos; Lacerda, Claudivan Feitosa; Mesquita, Rosilene Oliveira; de Melo, Alberto Soares; da Silva Ferreira, Jorge Freire; Teixeira, Adunias dos Santos; Ribeiro Vieira Lima, Silvio Carlos; da Silva Sales, Jonnathan Richeds; Silva, Johny de Souza; Gheyi, Hans Raj
通讯作者	Cavalcante, ES
来源期刊	AGRICULTURE-BASEL
EISSN	2077-0472
出版年	2022
卷号	12 期号:4
英文摘要	Dry spells in rainfed agriculture lead to a significant reduction in crop yield or to total loss. Supplemental irrigation (SI) with brackish water can reduce the negative impacts of dry spells on net CO2 assimilation in rainfed farming in semi-arid tropical regions and maintain crop productivity. Thus, the objective of this study was to evaluate the net carbon assimilation rates, indexes for water use efficiency, and indicators of salt and water stress in maize plants under different water scenarios, with and without supplemental irrigation with brackish water. The experiment followed a randomized block design in a split-plot design with four replications. The main plots simulated four water scenarios found in the Brazilian semi-arid region (Rainy, Normal, Drought, and Severe Drought), while the subplots were with or without supplemental irrigation using brackish water with an electrical conductivity of 4.5 dS m(-1). The dry spells reduced the photosynthetic capacity of maize, especially under the Drought (70% reduction) and Severe Drought scenarios (79% reduction), due to stomatal and nonstomatal effects. Supplemental irrigation with brackish water reduced plant water stress, averted the excessive accumulation of salts in the soil and sodium in the leaves, and improved CO2 assimilation rates. The supplemental irrigation with brackish water also promoted an increase in the physical water productivity, reaching values 1.34, 1.91, and 3.03 times higher than treatment without SI for Normal, Drought, and Severe Drought scenarios, respectively. Thus, the use of brackish water represents an important strategy that can be employed in biosaline agriculture for tropical semi-arid regions, which are increasingly impacted by water shortage. Future studies are required to evaluate this strategy in other important crop systems under nonsimulated conditions, as well as the long-term effects of salts on different soil types in this region.
英文关键词	tropical semi-arid saline water biosaline agriculture complementary irrigation water stress photosynthesis
类型	Article
语种	英语
开放获取类型	gold
收录类别	SCI-E
WOS记录号	WOS:000785353000001
WOS关键词	PROLINE ACCUMULATION ; CROP-ROTATION ; SOLUTE ACCUMULATION ; SALINE WATER ; COWPEA YIELD ; GENOTYPES ; STRESS ; BARLEY ; GROWTH ; WHEAT
WOS类目	Agronomy
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/2XILL650/391674
推荐引用方式 GB/T 7714	Cavalcante, Eduardo Santos,Lacerda, Claudivan Feitosa,Mesquita, Rosilene Oliveira,et al. Supplemental Irrigation with Brackish Water Improves Carbon Assimilation and Water Use Efficiency in Maize under Tropical Dryland Conditions[J],2022,12(4).
APA	Cavalcante, Eduardo Santos.,Lacerda, Claudivan Feitosa.,Mesquita, Rosilene Oliveira.,de Melo, Alberto Soares.,da Silva Ferreira, Jorge Freire.,...&Gheyi, Hans Raj.(2022).Supplemental Irrigation with Brackish Water Improves Carbon Assimilation and Water Use Efficiency in Maize under Tropical Dryland Conditions.AGRICULTURE-BASEL,12(4).
MLA	Cavalcante, Eduardo Santos,et al."Supplemental Irrigation with Brackish Water Improves Carbon Assimilation and Water Use Efficiency in Maize under Tropical Dryland Conditions".AGRICULTURE-BASEL 12.4(2022).