SOIL PREPARATION
Steel frame
1.5 m
Trapdoor
1.0 m
Galvanised window frame
Wooden side panel
Glass panel
2.5 m
FIGURE 4.2: Root observation chamber with glass panels for studying grapevine root growth in situ (Van Zyl, 1984).
FIGURE 4.3: The quantitative excavation of roots to determine their lateral as well as vertical distribution is time-consuming and labour-intensive (Photo: ARC Infruitec- Nietvoorbij).
50 | ROOT RESPONSE TO SOIL CONDITIONS
Made with FlippingBook Annual report