自1973年秋石油危机后,使人们更加认识到石油资源的有限性,因此世界各国对石油资源代用燃料的开发研究,给予了极大的关注,使这项研究得到了迅速地发展。农用动力的供求矛盾,对第三世界国家尤为突出。以我国1980年为例,农用动力为2.2亿马力,其中内燃机仅为1.4亿马 Since the oil crisis in the autumn of 1973, people have become more aware of the limited nature of petroleum resources. Therefore, countries around the world have paid great attention to the research and development of alternative fuels for petroleum resources, and this research has been rapidly developed. Contradiction between supply and demand for agricultural power is particularly prominent in third-world countries. Taking China as an example in 1980, the agricultural power was 220 million horsepower, of which the internal combustion engine was only 140 million horses.