Big rapeseed. Because the growth characteristics of small rapeseed are short plants, relatively cold-resistant and drought-tolerant, but the yield is relatively low, with an oil yield of about 30%, while the growth characteristics of large rapeseed are taller plants, not cold-tolerant, easy to freeze to death in winter, and like water and fertilizer. The yield is relatively high, and the oil yield is about 35%. Therefore, compared with the two, rapeseed produces more oil.