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Two kinds of field experiments were conducted in Yongshou, Shaanxi Province, and Louyang, Henan Province, to study wheat responses to nitrate and ammonium N applied at different times with three treatments: control, nitrate and ammonium N at a rate of 100kgNha−1 as basal fertilizer. During the plant growing period, pH, ammonium and nitrate N were determined in rhizosphere and bulk soil, and nitrate...
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