Root size is typically measured by assessing the diameter of the root. The specific method used depends on the size and type of root being examined.
For small roots, especially when precision is needed, researchers often use:
- Microscope with Ocular Micrometer: Freshly washed root samples are examined under a microscope. The ocular micrometer, a measuring scale within the microscope's eyepiece, allows for direct and accurate measurement of the root diameter.
For larger roots, more readily available tools can be used:
- Hand Lens: A simple magnifying lens can aid in visual inspection and measurement, especially when combined with a ruler or other measuring device.
- Micrometer Screw or Calipers: These tools, graduated to a tenth of a millimeter, provide a more precise measurement of the root diameter.
In summary, root diameter measurement varies based on the root's size, ranging from microscopic analysis for fine roots to using calipers for larger ones.
