Leaching loss of nitrate from semiarid area agroecosystem

Abstract

Abstract: A 6 years lysimeter experiment shows that an obvious nitrate leaching even occurred in semiarid area agroecosystem.The leaching loss was positively related to precipitation,and had a signficant difference among years with different precipitation.The application rate of N fertilizers determined the amount of leaching loss,but no obvious difference was found between urea and ammonium bicarbonate.Different depth of soil had different water storage,and therefore, had different leached amounts.Summer fallowing could increase the potential nitrate leaching loss.

Key words: Nitrate nitrogen, Leaching loss, Semiarid area, grain-leaf ratio., nitrogen application rate, winter wheat, canopy, drip irrigation

LI Shiqing, Li Shengxiu. Leaching loss of nitrate from semiarid area agroecosystem[J]. Chinese Journal of Applied Ecology, 2000, 11(2): 240-242.

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