《Table 1 Test design》

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《Effects of Applying Humic Acid and DMPP Compound Fertilizer on the Growth of Maize》

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kg/t

The fertilizer used in the CK control was compound fertilizer.Humic acid was added at concentrations of 5，10 kg/t，and DMPP at 0.5，1 kg/t.Humic acid and DMPP were compounded in pairs at different concentrations，and sprayed uniformly on the surfaces of fertilizer granules according to different dosages.As shown in Table 1，a total of 9 treatments were set.The test maize was planted on June 15 and harvested on August 20，2015.Each pot contained 7.5 kg of soil.The amount of fertilizer was N-P2O5-K2O=0.12-0.12-0.12 g/kg，equivalent to 15-15-15 compound fertilizer of 6 g/pot.After thoroughly mixing with the soil，1 plant was planted in each pot with 6 repetitions for each treatment.Except for experimental factors，the remaining field management and other conditions were the same.