For underground irrigation of trees (fruit trees, forest trees, ornamental trees): Bury the diffuser 50-70cm below the soil surface alternatively install the diffusers before the plantation pits for the installation of the tree. In this case the diffuser should be 50-70cm far from the axis of the tree.
For the irrigation of shrubs and perennial medicinal or ornamental herbs, the diffusers are installed in pits or holes 20 to 40 cm deep below the soil surface (topographic surface) and 20 cm far from the axis of the shrubs and perennial medicinal or ornamental herbs.
Installation of the Tree and Shrub Diffuser
For the installation of diffusers for trees and shrubs, holes are dug at the edge of the canopy of the tree or shrub. If the canopy is between 1m and 2m it is recommended to put 2 diffusers. If the canopy is between 2m and 4m it is recommended to put 3 diffuses. Beyond 5m it is recommended to put 4-6 diffusers. Each square hole (40x50cm) or circular hole (ϕ 35-40 cm), must have a depth of 60cm. If using augers, the hole depth must be 60cm, and the diameter must be at least 35 cm for the 30cm/15cm diffusers and 25cm for the15cm/15cm diffusers.
Place the diffuser at the bottom of the hole, cover the hole and press down the soil. If you choose to bury the pipes and the dosing emitter you should shorten the diffuser’s pipe by 10cm.
If the soil is hard and difficult to dig through, set up water dosing emitters connected to the water distribution pipe (ϕ 16mm or 20mm) along the edge of the canopy. Allow the dosing emitters to release water for 10-12 hours to moisten the soil as a “pre – irrigation” to help facilitate digging the hole for the diffuser.
For diagrams on installing the tree diffuser and for more information please click here