Soil Sulfur Deficiency Restricts Canola (Brassica napus) Productivity in Northwestern RussiaRegardless of NPK Fertilization Level

Canola cultivation at high latitudes is becoming more promising in terms of modern climate change. Sustainable crop production requires an understanding yield-limiting factors, which need to be adjusted agricultural management first. Therefore, our study was aimed examining the effect and soil fertility factors on canola yield from 2012 2015 northwestern Russia. Simultaneously, effectiveness chemical fertilizer (N65P50K50 N100P75K75) rates tested. Studied soils had light texture, acidity severe sulfur deficiency. (Y) varied 0.81 1.60 t·ha−1 for observed period. Applied increased Y by around 30%, but this change not significant. Climate testing with FAO-AquaCrop simulation showed no noticeable water heat stresses period (0% 20% reduction potential Y). Among tested properties, content organic carbon, available nitrogen significantly correlated (r = 0.58–0.66). Combining these together pH a path model explained 60% variability Y. Importantly, highest most significant model. Thus, parameter main factor area, must first practice.