[Leaching loss of nitrate from semiarid area agroecosystem].
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.
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Department of Natural Resources and Environment Science, Northwestern Agricultural University, Yangling 712100. Lisq@public.xa.sn.cn
Li
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D018556:Crops, Agricultural; D017753:Ecosystem; D005308:Fertilizers; D009566:Nitrates / Q000032:analysis*; D014867:Water
D005308:Fertilizers; D009566:Nitrates; D014867:Water