Water and Nitrogen Use Efficiencies of Spring Wheat Cultivars.

Spring wheat was grown on a fine-sandy loam soil in Northwestern Montana under irrigated and dryland conditions (main factor), four different nitrogen levels (subplot) and eight cultivars (sub-subplot) randomly arranged within N levels with four replications. Nitrogen was applied at preplant using Valmar^TM, incorporated, and packed to attain optimum seed to soil contact. Spring wheat varieties were Brennan, Buck Pronto, Cabernet, Expresso, McNeal, Solano, Volt, and WB Rockland and was planted on April 22, 2015. Irrigation was applied to maintain plant available water above 50% using surface drip tapes. Total irrigation applied was 222 mm (8.75 inches). Weeds, insects and diseases were controlled. Plots were harvested using a Wintersteiger^TM plot combine. Yield and agronomic data were recorded and analyzed in SAS using proc-mixed model. Water and nitrogen use efficiencies were calculated using grain yield per unit water and nitrogen, respectively.