Field plot experiment was carried out on Xiangzayou763 to study the effects of different fertilizer application levels (N : P205 : K20 : B, treatment A, 240 : 120 : 210 : 1.2 kg/hm^2; treatment B, 180 : 90 : 157.5 : 0.9kg/hm^2; treatment C, 120 : 60 : 105 : 0.6 kg/hm^2; treatment D: 60 : 30 : 52.5 : 0.3 kgdam^2; treatment E, no fertilizer) and different planting densities (7.5×10^4, 1.5×10^5, 2.25×10^5, 3.0×105, 3.75×10^5, 4.5×10^5 plant/bin^2) on oil content, protein content, thioglycoside content and erucic acid cont...