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Grain yield (t ha−1) in the field experiment in 2007 and 2008. Effects of N fertilizer supplies and benomyl on maize grain yield. Each value is the mean of four replicates (±SE). Different letters above bars denote significant difference among treatments at a specific growth stage (P < 0.05). –N–B: no N fertilizer and no benomyl; –N+B: no N fertilizer and benomyl; +N–B, N fertilizer and no benomyl; +N+B, N fertilizer and benomyl.
