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Experimental treatment and fertilization

YL Yan Li
FF Feng Fang
JW Jianlin Wei
XW Xiaobin Wu
RC Rongzong Cui
GL Guosheng Li
FZ Fuli Zheng
DT Deshui Tan
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Two treatment groups were set up in this experiment, namely inorganic fertilizers (control, C), and humic acid fertilizer (HA). Three replicates were performed for each treatment. The irrigation time, frequency, and quantity were identical among the two treatments. The treatment for the C and HA groups were based on local farming habits. Specifically, 58.7 kg/ha of urea, 33.3 kg/ha of triple superphosphate and 37.5 kg/ha of potassium chloride were applied as nitrogen, phosphate and potassium fertilizers, respectively, which equal to 27.0 kg/ha of pure nitrogen, 15.0 kg/ha P2O5, and 22.5 kg/ha K2O, respectively. These fertilizers were applied as a one-time base fertilizer into the topsoil (0–20 cm). The HA was added 1000 kg/ha humic acid (from the Dalian Jiucheng Products Company (Dalian, China), with humic acid 75%), which was applied with the base fertilizer.

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