Dutch Plantin 18 www.agrii.co.uk Buffering: Because Coco-pith has a negatively charged complex, there are positively charged ions primarily consisting of sodium and potassium on this complex. This doesn’t cause many problems to start with, because these elements surround the complex (like iron to a magnet) and are bound and therefore not available to the plant root. The problem, however, begins after fertilising with calcium or magnesium (elements often used in cultivation). The calcium will push the sodium and potassium from the complex and take their place. This all sounds very theoretical but it has real consequences for growers: although they feed the plants, calcium, sodium and potassium will become available to the plant roots instead. To prevent this from happening, Dutch Plantin has added another coco product to their range; besides washed coco, they also offer buffered-coco-pith. In the buffered coco- pith the ions have been exchanged and the excess of sodium and potassium have been washed away…the time bomb has been deactivated! Aging: To guarantee the stability of the Coco-pith, Dutch Plantin ‘ages’ the Coco-pith before further treatment. Although this is a quite expensive way of production, we do this to avoid problems with breaking down of the Coco-pith and to improve the stability and reliability of your growing medium. Washing: Many customers prefer to have a washed material because this ﬁts better in their culture or way of working. To avoid surprises with high EC’s, Dutch Plantin washes the Coco-pith before sending it to the customer. The EC is washed down to less than 1,0 mS/cm in 1:1,5 dilution. For this purpose, Dutch Plantin has access to clean water reserves.