Modification of transient state analytical model under different saline groundwater depths, irrigation water salinities and deficit irrigation for quinoa

Salinization of soil is primarily caused by capillary rise from saline shallow groundwater orapplication of saline irrigation water. In this investigation, the transient state analytical modelwas modified to predict water uptake from saline shallow groundwater, actual cropevapotranspiration, soil water content, dry matter, seed yield and soil salinity under differentsaline groundwater depths, irrigation water salinities and deficit irrigation for quinoa.Considering the effect of salinity on soil saturated hydraulic conductivity and maximum rootdepth in presence of shallow saline groundwater, the model resulted in good agreement betweenthe measured and predicted saline groundwater uptake, soil salinity increase at differentgroundwater depths (300-800 mm) and water salinity (10-40 dS m-1). Therefore, the modifiedmodel is applicable for quinoa yield and soil salinity prediction and it could be a valuable toolfor soil salinity management in presence of shallow saline groundwater. Furthermore, predictionof quinoa yield by the modified model can be used for better irrigation water salinitymanagement under different saline groundwater depths, irrigation water salinities and deficitirrigation.

Keywords:

Quinoa , Growth modeling , Groundwater uptake , Water salinity , Deficit irrigation