Abstract

The impact of three level of salinity (T₀ = 1.2 dS m^-1, T₁ = 9.2 dS m^-1 and T₂ = 18 dS m^-1) on photosynthetically active radiation intercepted (PARabs), Radiation Use Efficiency at pre-anthesis and post-anthesis (RUE_PR and RUE_PS), Radiation Use Efficiency of total dry biomass (RUE_TDM) and Radiation Use Efficiency of Grain Yield (RUE_GY) at quinoa harvest were investigated during the growing season (2015). The RUE pre-anthesis (from transplanting to anthesis) has registered a decrease of 10.8 and 15.8% respectively in T₁ (RUE_PR = 4.62 g MJ^-1) and T₂ (RUE_PR = 4.36 g MJ^-1) compared to the control T₀ (RUE_PR = 5.18 g MJ^-1). Likewise, the RUE post-anthesis was reduced by 8.9 and 32.1% in T₁ (RUE_PS = 1.23 g MJ^-1) and in T₂ (RUE_PS = 0.91 g MJ^-1), dissimilarity to T₀ (RUE_PS = 1.35 g MJ^-1). The maximum RUE_TDM (3.2 g MJ^-1) was manifested in (T₀). However, the minimum RUE_TDM (2.8 g MJ^-1) was observed in T₂ (S = 18 dS m^-1). A decline of 16.1% was observed in RUE_TDM due to the reduction on TDM from T₀ (S = 1.2 dS m^-1) to T₂ (S = 18 dS m^-1). As well, the RUE_GY declined when salinity increased. The highest RUE_GY (1.24 g MJ^-1) was registered in T₀. However, the lowest RUE_GY (0.62 g MJ^-1) was obtained in T₂. A decrease of 50% in RUE_GY due to the height reduction on yield was observed in the T₂.

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