study on Energy Inputs in Agriculture and Their Efficiencies in Shanghai Outskirts

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cje ›› 1987, Vol. ›› Issue (5): 21-26.

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study on Energy Inputs in Agriculture and Their Efficiencies in Shanghai Outskirts

Wang Fangtao

Institute of Soil and Fertilizer, Shanghai Academy of Agricultural Sciences

Received:1986-06-27 Online:1987-10-10

Abstract

Abstract: The energy inputs,outputs and their structures in agriculture of Shanghai Outskirts werestudied.The results indicated when the chemical nitrogen fertilizers accounted for 72.4% in the total mineral energy inputs the efficiencies Of the energy inputs were reduced.There-fore,a proper decrease of the application of chemical nitrogen fertilizers was suggested.

Key words: Wetland ecosystem, Distribution characteristics of phosphorus and potassium, Seasonal dynamics, Sanjiang Plain

Wang Fangtao. study on Energy Inputs in Agriculture and Their Efficiencies in Shanghai Outskirts[J]. cje, 1987, (5): 21-26.

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study on Energy Inputs in Agriculture and Their Efficiencies in Shanghai Outskirts

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