重庆市壁山县双碑四组肥料施用与农田生态氮素循环初探  

A PRELIMINARY STUDY OF FERTILIZER APPLICATION AND NITROGEN CYCLE IN AGRO-ECOSYSTEM

作　　者：何新华[1] 李晓堤 

机构地区：[1]云南师范大学生物系 [2]云南省昆明市第5中学

出　　处：《农村生态环境》1990年第4期34-38,共5页Rural Eco-Environment

摘　　要：本文从农田生态系统中氮素循环出发,比较了双碑四组1976—1980年的肥料施用和粮食生产中的氮素输入和输出。结果表明,土壤氮素消耗大于积累(-33_34％——+11.0％);有机与无机肥料施用比例明显失调(1.00:1.02);化学氮肥投资(不变价格)占农业总投资的比例以平均2.5％的递增率逐年上升。只有广辟肥源,生物固氮,科学施肥,强化农田氮素输入,才能保持农田生态系统中氮素平衡。只有提高氮肥利用率和肥料经济效益,才能达到增产增收。Nitrogen input and output in manure applications and grain yields from 1976 -1980 in Shuangbe No. 4 brigade are analysed and compared. The results show that the nitrogen consumption was higher than the nitrogen accumulation in the soil nitrogen balance ( -33.4%-+ 11.0% ), the ratio of organic manures and chemical fertilizers was obvious disorder (1.00:1.02) ; and the ratio of chemical fertilizer investment(unvaried price) in the total agrculture expenditures had increased by 2.5% every year. It is suggested that the nitrogen balance could be maintained by the plantation of green manure crops, proper application of manure and fertilizer and strengthening the nitrogen input into the farmland in the farmland eco-system, and [so on. Only by raising the nitrogen utilization coefficient and the manure economic effect could the grain yield and farmer's income be increased in the agricultural production.

关 键 词：肥料 施用 农田 氮素 生态系统 

分 类 号：S181[农业科学—农业基础科学]