Fig. 1
From: Real-time monitoring of rhizosphere nitrate fluctuations under crops following defoliation
Generalised schematic diagram of column for NO3−-selective sensor experiments. Soil columns have dimensions of height = 50 cm and inside diameter = 15.4 cm. Possible experimental regime changes are marked in green, with the different assays possible shown in blue. Holes are available at three different levels for placement of the NO3−-selective sensors (shown as tip sensor photo symbol), at the top 1 cm (yellow), the bottom 1 cm (brown), and midway between (orange). Drainage holes were located at the bottom of the column, where soil water can be sampled using a lysimeter indicated with photo symbol of mini suction 10 Rhizon SMS lysimeters (Rhizosphere Research Products B.V., Wageningen, The Netherlands). Note microbial analysis was not performed in this work