Seed has 25 to 55 percent oil, 18 to 24 percent protein and 12 to 20 percent of the skin .klzahayy from which they extracted the oil called Canola.
less than 30 micromoles of glucosinolates per gram meal seed oil which has a large amount of unsaturated fatty acids and about 2% or less of erucic acid, and their oils are taken orally .
Because of the rape seed oil plant, this plant is grown for centuries in succession. The growth of the plant in the eastern coast of the Mediterranean Sea, although it has a very long history. Evidence that the herb and oil, in 2000 BC in India was used. In Eastern Europe this plant is grown from the fourteenth century. The seventeenth century, this plant is cultivated on a large scale in Europe.
Rapeseed field in the south of Cambridge, UK
Rapeseed field stigma, Iran
Flower of rape
Lack of macronutrients and micronutrients in the soil affects performance and reduces the performance of the plant ( most in need of food in canola plant growth and flowering time is in the spring 
Some micronutrients such as zinc and iron are essential for plant growth and physiological processes such as photosynthesis, chlorophyll production and the formation of plant growth hormones are involved and a lack of them leads to nutrient imbalances and ultimately reduce the quantity and quality of the product [ 7] in situations where the soil is deficient in micronutrients and dry soil, foliar sprays should these elements be used in canola early vegetative growth, which increases the yield and oil content . The increase in the number of pods per plant, seed yield and oil percent. 
Iron is another essential element for plant growth in terms of shortage, the number of photosynthetic pigments and chlorophyll content of leaves is reduced in this way we will reduce the weight of the grain.  by increasing the PH concentration of iron in the root of the increase in However, iron deficiency chlorosis of leaves show and concluded that nitrates cause absorption of iron and copper are in calcareous soils.  The importance of the meristematic regions due to its efficiency in the production of auxin in canola increased branching is 
PH alkaline soils due to soil application on, causes the organic matter combined with Vmjmvhhayy of the form that it is possible some of them are indissoluble. (Religious leader al 1367) Rape need quite a lot of nitrogen, but the reaction to the fertilizer depends on environmental conditions such as the weather conditions, soil type, soil moisture, as well as its genotype.  canola optimal performance Terms consumption of 200 kg of nitrogen per hectare has been achieved.  The use of ammonium sulfate with urea due to its solvent by pouring water on the leaves before flowering is very appropriate 
Since ammonium sulfate sulfur required to provide that rape is one of the elements of rape can be used effectively in practice . Water scarcity could impact negatively affect the performance of rape, but this effect depends on the genotype and stage of plant development . Rape water stress in different phonological stages have different effects in the oil and protein, and dealing with the reproductive stage of drought stress reduced its performance . In a wet environment, rapeseed irrigation, pods to prolong the flowering period and the number of seeds per pod by creating higher leaf area at flowering time down @ the most sensitive time for irrigation canola is flowering and early pod .
Canola varieties of rapeseed and temperate regions Vsrdsyrast.azlhazasydhay Vmkhsvs amino Gvgrddarvvytamynha rich. Canola meal on average 40% less than 2% of the total Zhrvtyyn Dard.myzan Avrvsyk acid fatty acids.
Containing less than 30 micromoles glucosinolates Drhrgrm dry without oil.