Kringloopbestendig telen in grond en in zandbedden : LWV19101

Samenvatting

Soil bound growers of several crops are reluctant in the application of reuse of drain water. In this project it is investigated if technical adaptations are required or substances are released in the water which may influence the growth. Analysing soil and water supply and drain for nutrients, salts, heavy metals or crop protection products did not show big differences at several companies. Plant response tests did not show any proof of appearance of substances released by the roots and accumulating in the recirculating water. The use of a bypass dosing unit for water and fertilizers in combination with surface water of varying quality and limited sampling of the water might be a reason of growth inhibition during the cultivation. No substance has been found which may cause growth inhibition.