500×40%=200 (kg); A: 500 kilograms of rapeseed can produce 200 kilograms of oil.

Rape, also known as Brassica napus, is the seed of cruciferous crops. Rape has long pods and full seeds. The oil content of rapeseed is 37.5%-46.3%. According to different types of rape, its oil content is also slightly different. It is one of the main oil crops and honey crops in China, and its seeds are one of the main varieties of oil-pressing raw materials.

Rape is cultivated all over China, which can be divided into winter rape and spring rape. Its planting area accounts for more than 40% of the total area of oil crops in China, and its output accounts for more than 30% of the total oil production in China, ranking first in the world.

This product is a Cruciferae plant, born in the area below 3700 meters above sea level. Panicum miliaceum. Straight root system. The stem is erect with few branches, and the plant height is 30 ~ 90 cm. Leaves alternate, divided into basal leaves and cauline leaves. Basal leaves are undeveloped, creeping, oval, petiolate, pinnately divided, terminal lobes are round or oval, densely setose and waxy. Cauline leaves and branched leaves have no petiole, the lower part of the stem leaves is pinnately split, the base expands to support the stem, and there are bristles and cilia on both sides;

The upper stems and leaves are violin-shaped or lanceolate, the base is heart-shaped, holding the stems, with drooping spikes on both sides, whole or with dendritic teeth. The flowering period is from May to July, and it is an infinite raceme, which is inserted at the top of the main stem or branch. The flower is yellow with 4 petals, which is a typical cruciform flower. 6 stamens, 4 strong stamens. The fruiting period is from August to September, with silique strip shape and beak at the top. Seeds spherical, purple-brown.

The fruit of rape is a pod. The pod consists of three parts: peck, main body and stem. When the pod matures, it will automatically crack due to dehydration and contraction. Rapeseed is spherical or ovoid and consists of seed coat, embryo and endosperm residue. The chemical composition of seeds generally contains 3.9%-5.2% nitrogen, 24.6%-32.4% protein, 5.7%-9.6% cellulose, 4. 1%-5.3% ash and 37.5%-46.3% oil.