|The industry now has a benchmark website to enter and review orchard data.
(right click and save to your computer)
Selecting and Measuring Random Sample Trees for Benchmarking
To select random trees:
- Use a dice to select a row number
- Use a dice to select a tree number in the row
- Do not use any tree that is clearly not representative (not thriving or significantly larger)
- Do not include any tree on the edge of the block, as these may be affected by other influences.
- Keep a record of the random trees selected so that you can use the same sample each season.
To measure trunk diameter (mid May to mid June:
- For average trunk diameter select 25 trees by this method, note these trees as your permanent sample trees
- Diameter is measured at 600 mm above ground level
- Specialist tape measures can give diameter reading by measuring circumference; otherwise measure circumference in milimeters, multiply by 7 and divide by 22
To measure blight percentage (January):
- Select 10 random trees as above
- Stand on north of tree; inspect the five nearest nuts along the bearing line for signs of blight.
- Any black spots from blight mean that the nut is counted as blighted.
- Move to east side and repeat, then south, then west – this means you have inspected 20 nuts and have a count of how many of them were blighted.
- Repeat for all ten trees.
- Add up the number of blighted nuts out of the 200 inspected, then divide by 2 to find the percentage.