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EXAMPLE OF STUDIES WHERE BLOCKING MAYBE EMPLOYED ARE
LISTED BELOW:

TREATMENTS BLOCKS EXPERIMENTAL UNITS
1.Corn varieties Area divided according Plots within the blocks
to soil fertility level
2.Hog ration Breeds Weanlings
3.Fertilizer rates for rice Rtice paddies Plots within the paddies
4.Sources of cuttings for Different portions of Area for each source of
sweet potato the camote vine cuttings
5.Feedsupplement in sex Chicks or pullets
poultry

ADVANTAGES OF RBCBD

1. Simple and flexible
2. Ability to reduce experimental error
3. Increases level of precision in experimental results
4. Accommodates any number of treatments and replications

DISADVANTAGE

1. It entails additional cost and space since replication must be always
the same among treatments.

RANDOMIZATION IN RCBD

Example: Varietal trial of 5varieties of rice (as treatments A,B,C,D and E. )
replicated four times

 STEP 1. Establish the peripheral lines of the study area with the
dimension of each experimental unit or plot, the spaces and distance
of planting and the alleys between blocks and plots as your guide.

Least FERTILITY GRADIENT Most fertile
fertile portion
portion

 STEP 2. Divide equally the whole area into blocks across the fertility
gradient. Corresponding to the number of replicates and each block
into the number of treatments.

Block Block
I II III IV I II III IV