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油桐是雌雄同株、异花授粉树种。因其栽培历史久,分布范围广,长期实生繁殖和自然、人工选择的结果,使其变异多样,良莠不齐,直接影响到油桐的产量、质量。现在河南省油桐林100万亩,结果面积约60多万亩,仅收桐子1300多万斤,平均亩产20斤左右,单株产量不足半斤。造成产量低的原因是多方面的,其中种性混杂,没有发展优良品种是重要原因之一。良种是速生丰产的物质基础。遵照毛主席“有了优良品种,即不增加劳动力、肥料,也可获得较多的收成”的教导,在油桐集中产区,依俈群众,
Tung tree is monoecious, cross-pollination tree species. Because of its long history of cultivation, distribution of a wide range of long-term breeding and natural, artificial selection of the results, make it varied, good and bad, directly affect the production and quality of tung tree. At present, there are 1 million mu of oil Tong Lin in Henan Province. The result area is about 600,000 mu. Only the Tongzi is collected more than 1,300,000 kg. The average yield is about 20 kg per mu and the yield per plant is less than half a catty. The causes of low yield are many, which mixed species, there is no development of fine varieties is one of the important reasons. Variety is a material basis for fast-growing and high yield. In accordance with Chairman Mao’s “good varieties, that is, without increasing labor, fertilizer, but also get more harvest” teaching, in tung oil producing areas, according to the masses,