Should the root tubes for the CI-600 / 602 be installed vertically, horizontally or at an angle?

The angle the CI-600 / 602 root tubes are installed will depend on the species, type of study (i.e. agriculture, forestry). Often, root tubes are installed at a 45° angle, especially when looking at fine root growth. However, a study by Villordon et al. (2011) , found vertically installed root tubes gave the best estimate of root growth and storage roots development in sweet potato, Ipomoea batatas.