Traditional Culture Encyclopedia - Weather inquiry - What indicators of rapeseed will affect the erucic acid content of rapeseed oil after pressing?
What indicators of rapeseed will affect the erucic acid content of rapeseed oil after pressing?
The research shows that temperature has a certain influence on the fatty acid composition of rape. According to the research of Canvin, D.T.( 1965), the erucic acid content is low and the oleic acid content is high in the process of rape seed ripening at high temperature. However, at low temperature, erucic acid content increased and oleic acid content decreased. In Canada, the erucic acid content of rape grown in summer is lower than that in winter. The content of fatty acids, especially erucic acid, in rapeseed cultivated in Japan and South Korea and harvested under the condition of changing cultivation seasons is negatively correlated with the average accumulated temperature from flowering to maturity. It can be seen that temperature is one of the main factors affecting erucic acid content. The temperature of rape maturity should be above 20℃, especially when the sunshine is sufficient, the temperature difference between day and night is large and the soil temperature is suitable, which is most conducive to the accumulation of oil. The oil content of rape seeds in Xinjiang is low, with an average of 32.34%, which is mainly due to the high temperature and dry weather during rape maturity, which is not conducive to oil accumulation. (2) lighting. The light condition has obvious influence on the oil content of rape, and sufficient light is beneficial to the accumulation of oil. According to the research of Oil Research Institute of China Academy of Agricultural Sciences (1980), the average oil content of rape seeds in Tibet is 45.70%, ranking first in the country, mainly because the altitude of Tibet is over 4,000 meters and the sunshine hours are over 3,000 hours, which is twice as high as that of other regions in the same latitude. (3) moisture. Rape needs more water at flowering and corn-opening stage, and the maximum water holding capacity in the field should reach 70 ~ 85% to meet the needs. Therefore, irrigation in the late arid area is beneficial to accumulation, but there is too much rain in the south, so attention should be paid to drainage to facilitate the formation of oil. (4) wind. Rape is a cross-pollinated crop. Because its flower organs are exposed, there are many buds, the flowering period is long, and it is mainly pollinated by bees, insects and wind, and biological hybridization is easy to occur in production, so the natural outcrossing rate of rapeseed is quite high, with cabbage type 10 ~ 30% and cabbage type 80 ~ 90%. This not only reduces the output, but also reduces the quality. Therefore, in the production of double-low rapeseed, it is necessary to concentrate on contiguous planting and strictly establish isolated production bases. Generally, 600 meters and 300 meters of space isolation is needed between cabbage varieties of the same type and between cabbage and cabbage varieties. In addition, different latitudes also have certain effects on the quality of rapeseed. Research Institute of Oilseed Crops, Chinese Academy of Agricultural Sciences (1974) studies that the oil content of rapeseed decreases with the decrease of latitude. For example, glycerol 3 is in Xiangyang (N32. ) oil content is 42.06%, which is in Jingzhou (N30. ) is 4 1.68%, in Changde (N29. ) is 38.59%, in Hengyang (N27. )35.77%。 In the range of altitude 1500m, there was a significant positive correlation between altitude and seed oil content (r=0.79). According to the research of Xu Yijun (1982), the glucosinolate content of the same rape variety changed when it was planted in different places. For example, Xiuyou 1 from Jiangxi was introduced into Jiaxing, Zhejiang, and the content of glucosinolates increased from 4. 19% to 4.85%. The content of glucosinolates in Guanzhong of Shaanxi Province decreased from 5. 13% to 4.23% after it was introduced to Nanjing.
Quoted from:/technology/files/145797.asp.
It has the color, transparency, smell and taste of normal low erucic rapeseed oil, and has no odor such as scorch and rancidity.
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