Partial root zone drying (PRD) sustains yield of potatoes (Solanum tuberosum L.) at reduced water supply
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Partial root zone drying (PRD) sustains yield of potatoes (Solanum tuberosum L.) at reduced water supply. / Shahnazari, Ali; Liu, Fulai; Jacobsen, Sven-Erik; Jensen, Christian Richardt; Andersen, Mathias Neumann.
In: Acta Horticulturae, Vol. 792, 2008, p. 581-586.Research output: Contribution to journal › Conference article › Research › peer-review
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TY - GEN
T1 - Partial root zone drying (PRD) sustains yield of potatoes (Solanum tuberosum L.) at reduced water supply
AU - Shahnazari, Ali
AU - Liu, Fulai
AU - Jacobsen, Sven-Erik
AU - Jensen, Christian Richardt
AU - Andersen, Mathias Neumann
N1 - Conference code: 5
PY - 2008
Y1 - 2008
N2 - Partial root zone drying (PRD) is a new water-saving irrigation strategy being tested in many crop species. Until now it has not been investigated in potatoes (Solanum tuberosum L.). A field experiment on sandy soil in Denmark was conducted under a mobile rainout shelter to study effects of two subsurface drip irrigation treatments ((1) Full Irrigation (FI) receiving 100% of evaporative demand; and (2) PRD receiving 70% water of FI) on potato yield, tuber size, leaf water relations and irrigation water use efficiency (IWUE). The PRD treatment was started just after the end of tuber initiation for two months during tuber bulking and maturing stage and was shifted from one side to the other side of the plants every 5-10 days when FI plants had used 20-25 mm. Compared to FI plants, stomatal conductance was generally lower in the PRD-treated plants, whereas leaf water potential tended to be lower on only a few days. No significant difference was found between the treatments in tuber yield. IWUE was 61% higher in the PRD than in FI treatment. We conclude that reduction of soil water content under PRD induced partial stomatal closure. The effect likely contributed to water saving under PRD irrigation. The reasons for a better tuber size distribution caused by PRD, however, remain elusive. For optimizing PRD irrigation, the crop physiological reactions to shifting intervals and level of irrigation reduction should be further studied at different growth stages.
AB - Partial root zone drying (PRD) is a new water-saving irrigation strategy being tested in many crop species. Until now it has not been investigated in potatoes (Solanum tuberosum L.). A field experiment on sandy soil in Denmark was conducted under a mobile rainout shelter to study effects of two subsurface drip irrigation treatments ((1) Full Irrigation (FI) receiving 100% of evaporative demand; and (2) PRD receiving 70% water of FI) on potato yield, tuber size, leaf water relations and irrigation water use efficiency (IWUE). The PRD treatment was started just after the end of tuber initiation for two months during tuber bulking and maturing stage and was shifted from one side to the other side of the plants every 5-10 days when FI plants had used 20-25 mm. Compared to FI plants, stomatal conductance was generally lower in the PRD-treated plants, whereas leaf water potential tended to be lower on only a few days. No significant difference was found between the treatments in tuber yield. IWUE was 61% higher in the PRD than in FI treatment. We conclude that reduction of soil water content under PRD induced partial stomatal closure. The effect likely contributed to water saving under PRD irrigation. The reasons for a better tuber size distribution caused by PRD, however, remain elusive. For optimizing PRD irrigation, the crop physiological reactions to shifting intervals and level of irrigation reduction should be further studied at different growth stages.
KW - Former LIFE faculty
KW - irrigation water use efficiency
KW - stomatal conductance
KW - leaf water potential
KW - soil water content
U2 - 10.17660/ActaHortic.2008.792.68
DO - 10.17660/ActaHortic.2008.792.68
M3 - Conference article
VL - 792
SP - 581
EP - 586
JO - Acta Horticulturae
JF - Acta Horticulturae
SN - 0567-7572
Y2 - 28 August 2006 through 2 September 2006
ER -
ID: 8111152