last year was published a really interesting paper with some recommendations on truffle orchard management the first years, prior the fruiting stage.
I just upload the paper with the author’s permit at my dropbox account:
The main results are:
– in order to improve tree survival, the weed control is better than to water or fertilize.
– use of glifosate (Round-up) at early spring gives better results than a shallow plough. Glifosate increases the rate of survival and at the same time, increases the level of truffle infection in the roots.
– Some water stress increases the roots/shoot ratio.
– To water half of potential evapotranspiration in the summer duplicates the level of truffle infection. This watering rate do not increases tree grouth.
– most truffle mycorhiza where found at 10-30cm deep in the soil. Almost no mycorhizas in the first 10cm.
hope you’ll find quite usefull.
All the best,
Marcos S. Morcillo