随着工业化水平的逐步提高，环境污染日益加量。化学农药、化肥等的大量使用和食品生产加工过程中合成添加剂如防腐剂、人工色素等的普遍使用，食品污染和品质下降的问题越来越受到人们的关注。早在二十世纪三四十年代，就有人提出保护土壤的“健康”，发展有机农业，为人类生 With the gradual increase of industrialization level, the environmental pollution is increasing day by day. The widespread use of chemical pesticides, fertilizers, etc., and the widespread use of synthetic additives, such as preservatives, artificial colors and the like, in food production and processing have drawn more and more attention. As early as the 1930s and 1940s, it was proposed that the “health” of the soil should be protected, that organic agriculture should be developed and that human beings