Test strips

What is a test strip?

It is a strip across a farmer's field where one input is changed (either added, omitted or modified). Treatments within the strip may include a change in planting density, a new variety, or changes in fertilizer or pest management, etc... Test strips can be used for both farmer- or researcher-led field demonstrations.

Why have test strips?

Test strips are simple to highly visible. It is easy to apply and it offers a simple way to assess a treatment relative to the farmers current practice and circumstances. The strip plots are useful tools during field days for demonstrating “new” options for farmers.

To establish test strips:

1. Place adjacent to a road or point of high visibility for easy comparison with current farmers' practices.
2. Make sure the part of the field is representative of the field (and the district).
3. A 5 m wide strip across a field is generally adequate.
4. The whole field (including the strip) is managed by the farmer.
5. Test strips are best interpreted when there is a single treatment per strip.
6. Place a sign outlining the treatment and who to contact for more information.

Limitations of Addition Plots

• If the part of the field receiving the treatment is not representative for the rest of the field or region, conclusions on treatment performance may be incorrect.
• Test strips can only be used to highlight the effect of one treatment at a time.