Temporal and Spatial Profiling of Root Growth Revealed Novel Response of Maize Roots under Various Nitrogen Supplies in the Field
Figure 7
Temporal and spatial distribution of soil mineral nitrogen (Nmin; NH4+-N+NO3−-N) in the 0–60 cm soil profile in response to N fertilization in 2009.
The soil samples were obtained by excavating soil layers within a soil volume of 28 cm×35 cm and a total depth of 60 cm with 10 cm increments at each time after shoot harvest. The bars represent the standard error of the mean, n = 4.