Comparing the deep root growth and water uptake of intermediate wheatgrass (Kernza®) to alfalfa

AimsPerennial crops with more extensive and deep root systems could access stored water build resilience to shortage. In the context of human nutrition, perennial grain are very interesting. However, it is still questionable whether they effective in using subsoil water. We compared intermediate wheatgrass (Kernza®) Thinopyrum intermedium, a crop, alfalfa Medicago sativa, forage for growth uptake. Alfalfa was chosen because its system agronomical interest as companion crop.MethodsUsing TDR sensors, deuterium tracer labelling, minirhizotrons Hydrus-1D model we characterised distribution uptake patterns these two during cropping seasons under field conditions down 2.5 m soil depth.ResultsBoth grew roots 2.0 depth that were active but deeper rooted than wheatgrass. All experimental methods concluded used from below 1.0 simulations predicted 20 mm after anthesis 1 depth. Simulations confirmed advantage accessing drought.ConclusionsIn regions high groundwater recharge, growing deep-rooted have great potential exploit often left unused. road profitable crop long breeding cultivars increased at seems be worthy investment development drought tolerant cultivars.