Quality Raw Cassava and Planted in fertile soil to maintain quality, Maintained and guaranteed quality As well as being fertilized with manure regularly, it is also plowed by and manually to produce quality soil. cassava production also by utilizing ZPT. How to use it too, namely by soaking the cassava stems before planting in a ZPT solution mixed with clean water, for comparison. Then, soak the cassava stems for 24 hours, then drain and let stand until potential roots appear after which the cassava seeds are ready to be planted.