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Managing water table depth thresholds for potato subirrigation

Author

Listed:
  • Rens, Libby R.
  • Zotarelli, Lincoln
  • Ribeiro da Silva, Andre Luiz Biscaia
  • Ferreira, Camila J.B.
  • Tormena, Cássio A.
  • Rowland, Diane L.
  • Morgan, Kelly T.

Abstract

Subirrigation requires precise control of the water table level to provide adequate soil water content (SWC) for promoting plant growth. Optimizing water table level management has been shown to improve soil aeration, reduce N-leaching, and reduce risk of crop losses. The objectives of this study were to: i) assess if water table level and N-fertilizer rate impact potato growth, root development, plant N uptake, or tuber yield; and ii) estimate the optimum water table level threshold that provides sufficient soil upward water flux to meet plant water requirements. The study was conducted in 2013 and 2014 in Hastings, FL, USA. Water table level was automatically controlled in three independent irrigation zones of 1.4 ha at 36, 54, and 71 cm from the top of the hilled row, termed as high (HWT), medium (MWT), and low (LWT) water table treatments, respectively, and SWC measured at 22 cm depth was used as covariate to compare treatments. A randomized complete block with three replications was used to evaluate potato cultivars ‘Atlantic’ and ‘FL1867′ under 0, 112, 224, and 336 kg ha−1 of N-fertilizer within water table treatments. Marketable yield in 2013 was lower than 2014, owing to the high precipitation (421 mm) during tuber bulking that led to high SWC and tuber decay. Total and marketable tuber yields were maximized when N fertilizer rates ranged from 243 to 336 kg ha−1. The highest yield and proportion of large tubers occurred when SWC at 22 cm ranged from 0.13 to 0.16 m3 m−3. The HWT significantly limited root length, diameter, and surface area, compared to the LWT. In 2014, variation of SWC at 22 cm depth had little effect on tuber yield. The HWT was not detrimental to tuber yield, but rather it compounded the negative effect that high precipitation rate had on fluctuating SWC in the root zone, resulting in reduced yield and tuber quality. Optimal SWC in the root zone can be achieved by adjusting the water table level and upward soil water flux throughout the season, according to the crop evapotranspiration for each crop stage, which reduces irrigation water requirements and minimizes the risks of soil water saturation and tuber yield losses.

Suggested Citation

  • Rens, Libby R. & Zotarelli, Lincoln & Ribeiro da Silva, Andre Luiz Biscaia & Ferreira, Camila J.B. & Tormena, Cássio A. & Rowland, Diane L. & Morgan, Kelly T., 2022. "Managing water table depth thresholds for potato subirrigation," Agricultural Water Management, Elsevier, vol. 259(C).
    • Handle: RePEc:eee:agiwat:v:259:y:2022:i:c:s0378377421005138
    DOI: 10.1016/j.agwat.2021.107236
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    References listed on IDEAS

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    1. Ferreira, Camila Jorge Bernabé & Zotarelli, Lincoln & Tormena, Cássio Antonio & Rens, Libby R. & Rowland, Diane L., 2017. "Effects of water table management on least limiting water range and potato root growth," Agricultural Water Management, Elsevier, vol. 186(C), pages 1-11.
    2. Ahmadi, Seyed Hamid & Plauborg, Finn & Andersen, Mathias N. & Sepaskhah, Ali Reza & Jensen, Christian R. & Hansen, Søren, 2011. "Effects of irrigation strategies and soils on field grown potatoes: Root distribution," Agricultural Water Management, Elsevier, vol. 98(8), pages 1280-1290, May.
    3. Guo, Huaming & Li, Guanghe & Zhang, Dayi & Zhang, Xu & Lu, Chang'ai, 2006. "Effects of water table and fertilization management on nitrogen loading to groundwater," Agricultural Water Management, Elsevier, vol. 82(1-2), pages 86-98, April.
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