Vetiver long hedgerows on flat land

Zimbabwe - Flood and erosion control on vertisols with slope of less that 1%.
I share with you a video clip from Graham Dabb's of the vetiver hedgerows planted at scale under a pilot program funded by the Malilangwe Wildlife Trust. (
--from Dick Grimshaw)
Graham writes: " Rains were not as good as the previous years but crops in the area look okay. Although not officially confirmed, as of yet, communities are commenting that the stem borer incidence in maize, where the vetiver is grown, is at its lowest level since 2019. Compiling more accurate information will be done over the next few weeks. .......Sediment retention is easily evident above and directly below all lines, particularly where hedges intersect gullies. Retention levels in these areas are on average 15 to 23cm. The hedges are also encouraging more and more farmers to plough on the contour"
This work: 
  1. shows that these long hedgerows are very workable and effective, and do not require large waterways to dispose diverted run off as in the case of contour terraces or bunds 
  2.  it dispels the often quoted theory that flat land does not erode or require conservation techniques 
  3. Australian should look at the possibility of including vetiver in "key line" technology 
  4. Commercial farmers in southern Brazil and Uruguay have serious erosion problems on commercial farms even when they use no-till methods of cultivation - vetiver hedgerows offer a solution 
  5. soil conservation is not the only benefit - others include groundwater recharge and pest control 
  6. where labor costs are high machine planting is quite feasible.