Abstract: The lack of energy resource in countrysides induces environmental deterioration of agricultural ecosystem, and this deterioration is getting serious in our country. Based on the present status of energy shortage in our countrysides and the ecological disturbance induced by it, the necessity of improving ecological balance in countrysides and studying the relationship between lack of energy resource and deterioration of ecosystem is discussed by the author.

Key words: Nutrient use efficiency, Resorption, Nutrient availability, Internal cycling, Nutrient loss