Green Area Index Tool
'GAI (Green Area Index), the ratio of leaf green area to the area of ground on which the crop is growing, is a useful tool in canopy management.
Below are a series of reference photographs for you to compare with your crop. For further details on how to use GAI, particularly in the management of forward crops see Topic Sheet 82 - Managing forward crops of oilseed rape.'
GAI 0.2
GAI 0.6
GAI 1.2
GAI 1.8
GAI 2.6
GAI 2.7 | 
