作物生长发育需要适宜的温度。在适温的范围外,往往生长不良,甚至死亡。夏季温度高,喜凉作物不但生长受到抑制,而且还容易发生病害。夏季蔬菜生产中出现的病毒病,其发病的原因与高温就有着密切的关系。我们在1975年、1976年进行了土壤降温剂的研究。试验初步证明:土壤降温剂能降低 Crop growth and development need suitable temperature. Outside of the proper temperature range, it often grows poorly and even dies. High summer temperatures, hi not only inhibited the growth of cool crops, but also prone to disease. The virus disease that appears in the summer vegetable production, the reason of its occurrence has the close relation with the high temperature. We conducted soil cooling agent research in 1975 and 1976. Preliminary test shows that: soil cooling agent can reduce