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Effects of Fertilizer Placement and Nitrogen Forms on Soil Nitrogen Diffusion and Migration of Red Yellow Soil in China

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Figure

Figure 1. Location of the experimental site at Dongzhi county of Chizhou city.
Figure 2. Dynamic changes of soil mixed uniformly with 12 cm top soil (mixed application), (b) placed in holes at 12-cm depth (point deep placement), NH -N+4 content under different fertilization methods (vertical direction)
Figure 4. Dynamic changes of soil mixed uniformly with 12 cm top soil (mixed application), (b) placed in holes at 12-cm depth (point deep placement), NO -N3− content under different fertilization methods (vertical direction)
Figure 6. Effects of different nitrogen (N) fertilizers on inorganic N (NH -N4+ + NO -N3−) contents in soils after a point deep placement (vertical direction) treatment
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