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Open AccessArticle

Unraveling Ecophysiological Mechanisms in Potatoes under Different Irrigation Methods: A Preliminary Field Evaluation

1
International Potato Center (CIP), Headquarters P.O. Box, Lima 1558, Peru
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Water Resources Doctoral Program, Universidad Nacional Agraria La Molina, Av. La Molina s/n, Lima 15024, Peru
3
CATIE—Centro Agronómico Tropical de Investigación y Enseñanza, Cartago Turrialba 30501, Costa Rica
*
Author to whom correspondence should be addressed.
Agronomy 2020, 10(6), 827; https://doi.org/10.3390/agronomy10060827
Received: 25 April 2020 / Revised: 22 May 2020 / Accepted: 26 May 2020 / Published: 11 June 2020
(This article belongs to the Special Issue Optimization of Water Usage and Crop Yield Using Precision Irrigation)
Potatoes—a global food security and staple crop—is threatened by dry spells in drought-prone areas. The use of physiological thresholds to save water while maintaining a reasonable tuber yield has been proposed, but their effects on physiological performances and usefulness under different irrigation methods are yet to be evaluated. In this study, photosynthetic traits were monitored to assess the effect of water restriction and rewatering under drip (DI) and furrow (FI) irrigations. The treatments consisted of two maximum light-saturated stomatal conductance (g s _ m a x ) irrigation thresholds (T2: 0.15 and T3: 0.05 mol H 2 O m 2 s 1 ) compared with a fully irrigated control (g s _ m a x > 0.3 mol H 2 O m 2 s 1 ). DI used less water than FI but promoted early senescence and low percentage of maximum assimilation rate (PMA) at late developmental stages. FI caused no yield penalization in T2 and higher recovery of carbon isotope discrimination and PMA than DI. It is suggested that moderate water quantities of early and frequently water pulses in the irrigation, promote short-term water stress memory improvement, senescence delay and more capability of recovery at late stages. View Full-Text
Keywords: drip irrigation; furrow irrigation; physiological recovery; potato yield; rewatering; water stress drip irrigation; furrow irrigation; physiological recovery; potato yield; rewatering; water stress
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Silva-Díaz, C.; Ramírez, D.A.; Rodríguez-Delfín, A.; de Mendiburu, F.; Rinza, J.; Ninanya, J.; Loayza, H.; Quiroz, R. Unraveling Ecophysiological Mechanisms in Potatoes under Different Irrigation Methods: A Preliminary Field Evaluation. Agronomy 2020, 10, 827.

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