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Mathias Neumann Andersen

Effects of salinity and soil-drying on radiation use efficiency, water productivity, seed set and final yield of field-grown quinoa (Chenopodium quinoa Willd.)

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  • Fatemeh Razzaghi, Denmark
  • S. H. Ahmadi, Shiraz University, Department of Irrigation, Faculty of Agriculture, Iran, Islamic Republic of
  • S.-E. Jacobsen, Department of Agriculture and Ecology, Faculty of Life Sciences, University of Copenhagen, Denmark
  • Christian Richardt Jensen, Afgrødevidenskab, Denmark
  • Mathias Neumann Andersen
Drought and salinity reduce crop productivity especially in arid and semi-arid
regions, and finding a crop which produces yield under these adverse conditions
is therefore very important. Quinoa (Chenopodium quinoa Willd.) is such
a crop. Hence, a study was conducted in field lysimeters to investigate the
effect of salinity and soil–drying on radiation use efficiency, yield and water
productivity of quinoa. Quinoa was exposed to five salinity levels (0, 10, 20, 30
and 40 dS m)1) of irrigation water from flower initiation onwards. During the
seed-filling phase the five salinity levels were divided between two levels of irrigation, either full irrigation (FI; 95 % of field capacity) or non-irrigated progressive drought (PD). The intercepted photosynthetically active radiation was
hardly affected by salinity (8 % decrease at 40 dS m)1) and did not differ significantly between FI and PD. Radiation use efficiency of dry matter was similar
between salinity levels and between FI and PD. In line with this, no
negative effect of severe salinity and soil–drying on total dry matter could be
detected. Salinity levels between 20 and 40 dS m)1 significantly reduced the
seed yield by ca. 33 % compared with 0 dS m)1 treatment owing to a 15–30 %
reduction in seed number per m2, whereas the seed yield of PD was 8 % less
than FI. Consequently, nitrogen harvested in seed was decreased by salinity
although the total N-uptake was increased. Both salinity and drought increased
the water productivity of dry matter. Increasing salinity from 20 to 40 dS m)1
did not further decrease the seed number per m2 and seed yield, which shows
that quinoa (cv. Titicaca) acclimated to saline conditions when exposed to
salinity levels between 20 and 40 dS m)1.
Original languageEnglish
JournalJournal of Agronomy and Crop Science
Pages (from-to)173-184
Publication statusPublished - 2012

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