In agricultural experiments often the existing practices on check varieties called control treatments are compared with new varieties or germplasms collected through exotic or domestic collections called test treatments. In some cases experimental material for test treatments is limited and it is not possible to replicate them in the design. However, adequate material is available for replicating control treatment in the design. Augmented designs are useful for these experimental situation.

An augmented design is any standard design in control treatments augmented with additional (new or test) treatments in complete or incomplete blocks in one-way heterogeneity setting. In general, these experiments are conducted using an augmented randomized complete block design, where the test treatments are replicated once in the design and control treatments appear exactly once in each block.

Hi Bera,

If you have enough material for your new treatment it would be better to replicate them more than once along with the existing strandard treatment the you can use the Dunnet multiple comparison test to compare. 

How do I use augmented block design in evaluation a single cross that has been advanced to F4 in rice