N Balance in Agroecosystem of Bishan County after Applying Nitrogenous Fertilizers

Abstract

Abstract: The input and output of nitrogen and grain yield during 1949-1980 in Bishan County are analysed. Theresults show that nitrogen consumption is higher than its accumulation(-31.6%,＋14.0%）and the ra-tio of organic-Nto chemlcal-N is obviously in disorder (2.00：0.67）.It is suggested that nitrogen bal-ance can be maintained through planting green manure crops and properly applying manure and chemicalfertilizers.Raising the utilization rate of N fertilizer and the econornic effect of manure can increase thegrain yield and income in agricultural production.

Key words: soil erosion, USLE/RUSLE model, vegetation cover and management factor, remote sensing.

He Xinhua. N Balance in Agroecosystem of Bishan County after Applying Nitrogenous Fertilizers[J]. cje, 1993, (5): 29-35.

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N Balance in Agroecosystem of Bishan County after Applying Nitrogenous Fertilizers

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