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- W2008627541 abstract "Water samples at zero tension were collected using an open-ended lysimeter and analyzed for NO 3 − -N from a Chicot sandy clay loam and a Ste. Rosalie clay soil under continuous corn (Zea mays L.) in 1993 and 1994, shortly after spring thaw. There was negligible leaching of NO 3 − -N at previous fertilizer N rates of 0 and 170 kg ha -1 in both soils. However, NO 3 − -N concentrations of the leachates from soils receiving 285 and 400 kg N ha -1 yr -1 varied from 1.4 to 80 mg L -1 , depending on the initial levels of soil residual NO 3 − -N and the supply of percolation water. When the initial levels of soil NO 3 − -N were relatively high and percolation of water was relatively slow in 1993, NO 3 − -N concentrations of the leachates ranged from 20 to 80 mg L -1 . Nitrite-N concentrations were from 1.4 to 15.6 mg L -1 when the initial levels of soil residual NO 3 − -N were relatively low and percolation was relatively fast in 1994. The occasional higher NO 3 − -N concentrations in the leachate from the previous higher N applications indicated a potential for contaminating surface and ground waters as a result of NO 3 − -N leaching in the early spring. Key words: Residual N, nitrate-N leaching, soil solution, continuous corn, N fertilization" @default.
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- W2008627541 date "2004-11-01" @default.
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- W2008627541 title "Nitrate leaching from residual fertilizer N after spring thaw in two corn agro-ecosystems" @default.
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- W2008627541 doi "https://doi.org/10.4141/s03-077" @default.
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