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Piet Sabbe 's Profile
Piet Sabbe
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Joined:
22/05/2012
Last Updated:
02/07/2012
Location:
El Limonal, Imbabura, Ecuador
Climate Zone:
Sub tropical
Web site:
www.bospas.org





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Parque Bambú - Ecuador

Parque Bambú - Ecuador

Ibarra - Imbabura, EC


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Parque Bambú - Ecuador
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Vetiver, an excellent tool for erosion control in subtropics and tropics.

Posted by Piet Sabbe about 7 years ago

After many years of searching and experimenting to find the ideal erosion barrier, Vetiver proved to be the best solution for erosion control, soil conservation and slope stabilization.

Vetiver (Vetiveria zizanioides) is a tropical grass from Indochina. The main characteristic is the vertical growth of the roots to a depth of 2…3 meters. Planted in hedges, along the contour line on the slope (see graphic) it develops – in about one year – into a strong barrier that stops run-off. The deposit of sediment behind the barrier results in ´induced terracing´. The distance between the hedges is calculated according to the inclination of the slope.

I have been using Vetiver for more than 15 years with excellent results. My farm is located in a subtropical valley, on the western slopes of the Andes, 1 000 m above sea level, with a precipitation of 1 500 mm/year. The whole region has been severely deforested during the past 65 years, resulting in a tremendous loss of fertile soil.

Vetiver is certainly not solving all problems related to erosion, but it is a powerful tool to stabilize hillsides and stop further depletion of the soil. For example, I have been able to perfectly stabilize a 50 m wide and 150 m long slope which, during every rainy season, sunk about 1,5 m.

In some cases, Vetiver is not a permanent solution but a pioneer intervention. One can plant trees between the hedges as part of a reforestation program or in an agroforestry set-up. During the first 3 or 4 years, when the trees are still small, Vetiver is the erosion controller.  Later, as the trees grow and root deep in the ground, Vetiver will lose its importance because the tree roots will be able to stabilize the slope. Furthermore, Vetiver – like any other grass specie - will perish in the shade of trees. That´s when the time has come to dig up the Vetiver grass and plant it in another location where erosion control is needed.

For more information, see:    www.vetiverconsultecuador.blogspot.com

 

One year old plant Vetiver hedge Graphic of vetiver planting Slope stabilization Sediment building up behind the vetiver hedge Planting vetiver on a 30 degrees slope Vetiver 10 months old Protection of an irrigation swale 7

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My Badges
Consultant
My Permaculture Qualifications
Unverified
Permaculture in the Andes
Type: Permaculture Design Certificate (PDC) course
Verifying teacher: Jeff Mecham
Other Teachers: Ian Evans
Location: Tabacunda Ecuador
Date: Jul 1996

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