We know that the wetting agent Fiba-Zorb lasts a long time from the 18 month Levington trial, but growers irrigate continuously during cultivation and we researched, with PBG at Naaldwijk, the possibility of Fiba-Zorb being rinsed or leached out by continual irrigation, as is the case with many wetting agents.​​

 

In both figures it can be seen that the irrigation has hardly any effect on the leaching of the Fiba-Zorb from the potting soil.
 

This is a most important feature and one that is important for the grower to use Fiba-Zorb.

 

Rinsed black peat treated with Fiba-Zorb. The ochre line, unrinsed, shows to be almost the same as the rinsed blue line.​​

 

The rinsed white peat potting soil having been treated with Fiba-Zorb unrinsed, ochre line, compared with rinsed, blue line..​​