Abstract:

Phenology refers to the periodic natural phenomena of animals, plants, weather, etc., that change with seasons. The Seventy−two pentads are the result of the meticulous observation and summary of natural phenomena by ancient ancestors in the practice of long−term production, and their application to the judging of agricultural time. This study built on previous studies and focused on the formation, evolution, characteristics and implications of the Seventy−two periods. It analyzed the record of the Seventy−two periods in historical literature and summarized their economic, social and cultural values in conjunction with contemporary production and life. The results showed that the historical changes of the Seventy−two pentads went through a long process from sporadic to abundant, from scattered to orderly, and from folk to official. Its response system had significant characteristics such as naturalness, timing, correspondence, typicality and dynamism, in accordance with the laws of natural science and agricultural production. The combination of promoting the Seventy−two pentads and modern technological means can provide more accurate and efficient guidance and services for agricultural production.

Key words: Phenology, Seventy?two Pentads, Phenological system, Scientific definition, Agricultural activities