Validation of a predictive model of the forage potential of Kernza® (Thinopyrum intermedium) and evaluation of the effects of its association with different legumes

Abstract

Kernza® is a perennial grain crop derived from intermediate wheatgrass (Thinopyrum intermedium (Host) Barkworth & Dewey) that offers many advantages over annual grain crops. In addition to its potential dual use for forage and grain production, it offers many ecosystem services. The integration of legume intercrops with the Kernza crop enhances these environmentally beneficial aspects. On the other hand, the beneficial effects of intercropping on Kernza yields have been demonstrated by several studies, especially due to the symbiotic relationship of legumes with Rhizobium spp. that allows the fixation of atmospheric N2. The analysis of the nutritional value of forages is essential to obtain optimal performance in animal production. Near infrared spectrometry offers a faster and less expensive prediction potential than reference methods. Two models of chemical composition prediction were compared, both of which offered acceptable predictions. These models were then used to predict the forage potential of intercrops of Kernza and 3 different legumes. Biomass yields were significantly higher in the monoculture microplots. The 3 legumes tested produced significantly different yields. Overall forage yields were highest for alfalfa and red clover. White clover had the highest forage potential values.