Canola rotation effects on soil water and subsequent wheat in the Pacific Northwest USA

Farmers in Mediterranean climate regions are increasingly growing canola (Brassica napus L.) wheat (Triticum aestivum L.)-based systems to break soil-borne pathogen disease cycles, control weeds, and enhance crop marketing opportunities. A 6-year rainfed cropping experiment was conducted near Ritzville, Washington USA from 2015 2021. The objective compare performance of winter spring canola, triticale (× Triticosecale Wittmack) (WT), (WW) measure their effects on soil water dynamics subsequent (SW). Overwinter gain stubble significantly reduced compared WT WW stubble. more precipitation, the greater differences among treatments early spring. There a trend all years for diminished overwinter Averaged over years, grain yield SW 1940, 2340, 2210 kg/ha grown WT, stubble, respectively (p = 0.045). Coefficients determination regression analysis each year showed high correlation between content 180 cm profile yield, except one extreme drought. This paper provides first report region decline after versus cereal crops, primarily due storage.