Effects of Elevated Atmospheric CO 2 Concentration and Water Regime on Rice Yield, Water Use Efficiency, and Arsenic and Cadmium Accumulation in Grain

Andrisa Balbinot, Anderson da Rosa Feijó, Marcus Vinicius Fipke, Dalvane Rockenbach, Joseph Harry Massey, Edinalvo Rabaioli Camargo, Marcia Foster Mesko, Priscila Tessmer Scaglioni and Luis Antonio de Avila
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Andrisa Balbinot: Crop Protection Graduate Program, Federal University of Pelotas (UFPel), Pelotas 96010-900, Brazil
Anderson da Rosa Feijó: Plant Physiology Graduate Program, Federal University of Pelotas (UFPel), Pelotas 96010-900, Brazil
Marcus Vinicius Fipke: Crop Protection Graduate Program, Federal University of Pelotas (UFPel), Pelotas 96010-900, Brazil
Dalvane Rockenbach: Tarumã Representações, São Borja, Brazil—Former Graduate Student at Crop Protection Graduate Program, Federal University of Pelotas (UFPel), Pelotas 97670-000, Brazil
Joseph Harry Massey: USDA Agricultural Research Service, 504 University Loop, East Jonesboro, AR 72401, USA
Edinalvo Rabaioli Camargo: Crop Protection Graduate Program, Federal University of Pelotas (UFPel), Pelotas 96010-900, Brazil
Marcia Foster Mesko: Center of Chemistry, Pharmaceutical and Food Sciences, Federal University of Pelotas (UFPel), Pelotas 96010-900, Brazil
Priscila Tessmer Scaglioni: Center of Chemistry, Pharmaceutical and Food Sciences, Federal University of Pelotas (UFPel), Pelotas 96010-900, Brazil
Luis Antonio de Avila: Crop Protection Graduate Program, Federal University of Pelotas (UFPel), Pelotas 96010-900, Brazil

Agriculture, 2021, vol. 11, issue 8, 1-13

Abstract: (1) Background: Elevated atmospheric CO 2 concentration affects the growth and development of the rice crop. In Southern Brazil, rice is traditionally produced with continuous irrigation, implying a significant amount of water used. Besides, continuous flooding favors the uptake of toxic elements such as arsenic (As) and cadmium (Cd). In this work, one Brazilian rice cultivar (IRGA 424) was tested for the effects of elevated CO 2 concentration and different water regimes on rice yield, and As and Cd accumulation in grain. (2) Methods: Rice was grown in two CO 2 concentrations (400 and 700 µmol mol −1 ) and two irrigation regimes (continuous and intermittent). It was evaluated the number of tillers, plant height, aboveground dry weight (ADW), water use efficiency (WUE), rice yield components, and As and Cd concentration in rice grain. (3) Results: Rice plants were taller and had a higher WUE when cultivated at e [CO 2 ]. The ADW and the rice yield component were not affected by CO 2 levels nor water regimes. Intermittent flood regimes had a lower average As concentration. The Cd concentration in the samples in both growing seasons and all treatments was below the limit of quantitation (8.76 μg kg −1 ). (4) Conclusions: Enhanced CO 2 concentration did not affect rice yield, increased the WUE, and reduced As concentration in grains. Regarding water management, the intermittent regime enhanced WUE and promoted a reduction in As concentration in grains.

Keywords: ADW; climate change; free-air CO 2 enrichment; Oryza sativa L.; water management (search for similar items in EconPapers)
JEL-codes: Q1 Q10 Q11 Q12 Q13 Q14 Q15 Q16 Q17 Q18 (search for similar items in EconPapers)
Date: 2021
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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