Morpho-physiological characteristics by sweet potato cultivars as function of irrigation depth

The sweet potato is an alternative energy source, but its sustainability depends on efficient water use. The objective of this study was to evaluate sweet potato morpho-physiological characteristics, and water use efficiency (WUE). Irrigation depths of 50, 75, 100, and 125% of crop evapotranspiratio...

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Bibliographic Details
Published in:	Anais da Academia Brasileira de Ciências Vol. 90; no. 4; pp. 3541 - 3549
Main Authors:	Delazari, Fábio T, Assis, Igor R, Cabrera, Diego F V, Ferreira, Mariane G, Dias, Luiz E, Rueda, Angelica, Zanuncio, José C, Silva, Derly J H
Format:	Journal Article
Language:	English
Published:	Brazil Academia Brasileira de Ciências 01-10-2018
Subjects:	Agricultural Irrigation - methods Ipomoea batatas Ipomoea batatas - growth & development irrigation management leaf temperature MULTIDISCIPLINARY SCIENCES Plant Leaves - growth & development Plant Stomata - physiology water stress water use efficiency water use efficiency water stress irrigation management leaf temperature Ipomoea batatas
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Summary:	The sweet potato is an alternative energy source, but its sustainability depends on efficient water use. The objective of this study was to evaluate sweet potato morpho-physiological characteristics, and water use efficiency (WUE). Irrigation depths of 50, 75, 100, and 125% of crop evapotranspiration (ETc) were applied. The morpho-physiological indicators, WUE, leaf area index (LAI), leaf water potential, leaf temperature, and leaf chlorophyll index (ICF), were evaluated. The WUE of the sweet potato cultivars increased until the 75% water depth of the ETc. The LAI of these cultivars increased with irrigation depth, with higher values at 100% of the ETc. The leaf water potential of the two sweet potato cultivars was lowest with the lower irrigation depth. Leaf temperature was closer to that of ambient temperatures in treatments with greater irrigation depth. The increase of the WUE with the greater accumulation of dry biomass is due to greater CO2 diffusion by stomata. The reduction in the growth of these plants is due to water stress limiting stomatal conductance, transpiration, leaf growth (LAI) and chlorophyll concentration, proportional to soil moisture conditions. The functional relationship between soil moisture and growth is essential to optimize irrigation management at different growth stages.
Bibliography:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	0001-3765 1678-2690 1678-2690
DOI:	10.1590/0001-3765201820170687