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Yield, water use efficiency and nitrogen uptake in potato: influence of drought stress

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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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Author notes

  1. G. Gianquinto

    Present address: Dipartimento di Agronomia Ambientale e Produzioni Vegetali, University of Padova, 35131, Padova, Italy

Authors and Affiliations

  1. Dipartimento di Produzione Vegetale e Tecnologie Agraric, University of Udine, 33100, Udine, Italy

    Luisa Dalla Costa, G. Delle Vedove, G. Gianquinto, R. Giovanardi & A. Peressotti

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  1. Luisa Dalla Costa
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  2. G. Delle Vedove
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  3. G. Gianquinto
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  4. R. Giovanardi
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  5. A. Peressotti
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Dalla Costa, L., Delle Vedove, G., Gianquinto, G. et al. Yield, water use efficiency and nitrogen uptake in potato: influence of drought stress. Potato Res 40, 19–34 (1997). https://doi.org/10.1007/BF02407559

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