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Jul 30, 2018

Castor, is a very common toxic crops, plant height, and plant life for more than 15 years, has a strong kind of sex, resistance to acid soil, are widely planted around the world, a leading producer of Brazil, India, China, south of hainan island, north to heilongjiang are cultivated, in production, most of north China, northeast China in the Yellow River and the Yangtze river's most widely distributed) and Thailand, is one of the world's top ten oil crops. Castor like in annual precipitation 700 mm above and warm under the conditions of growth, the most suitable growth temperature of 20 to 28 ℃. Castor seed of seed shell is hard, bibulous slower, should be timely planting in the spring, the rainy season, the seed germination period of temperature for 10 ~ 15 ℃, low temperature easy or to freeze to death, the young plants will delay flowering mature, and reduce the production and the oil content of seed; Therefore, when planting in the northern latitudes, attention should be paid to mastering the planting season. According to the color of its stem, castor bean plant can be divided into red stem and green stem. "No thorns" and "no thorns" can be distinguished by the presence or absence of fleshy spines on the fruit. It can also be divided into large and small seeds according to their size. A good castor bean can be judged by its appearance. Its seed coat is black and shiny, and the seed kernel is white, without spots and dry smell. Grasp a handful of castor bean seeds with your hand to make them firm and firm. If the seed skins do not break, the seeds are clean, plump and unshrivelled.

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