Yield, water use efficiency and nitrogen uptake in potato: influence of drought stress |
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| Authors: | Luisa Dalla Costa G Delle Vedove G Gianquinto R Giovanardi A Peressotti |
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| Institution: | (1) Dipartimento di Produzione Vegetale e Tecnologie Agraric, University of Udine, 33100 Udine, Italy;(2) Present address: Dipartimento di Agronomia Ambientale e Produzioni Vegetali, University of Padova, 35131 Padova, Italy |
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| Abstract: | Summary A lysimeter experiment was performed to study the optimal allocation of limited water supply in potatoes.
Irrigation regimes equal to 40, 60 and 80% of maximum evapotranspiration (ET) were evenly applied over the crop cycle. Other
treatments involved withholding 80 mm of irrigation, based on ET, beginning at each of three designated growth stages (tuber
initiation, early and late tuber growth). An irrigated control treatment, restoring the entire ET, was included for comparison.
Continuous drought stress reduced photosynthesis as irrigation volumes were reduced. Plant biomass and tuber yield decreased
almost proportionally to water consumption, so that WUE was roughly constant. N uptake was highest in the control and in 80%
ET treatment.
Withholding water during tuberisation severely hindered plant physiological processes and penalized tuber yield. Reductions
in photosynthesis, total biomass and yield were the greatest when drought was imposed during tuber initiation. The earliest
stress resulted in the lowest WUE and N uptake.
A new crop water stress index (SI) was proposed, which combines atmospheric demand for water and canopy temperature. |
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| Keywords: | water stress photosynthesis stress index dry matter partitioning tuber quality Solanum tuberosum L |
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