Which of the following statement is not correct about a randomized complete block experiment?

Correct option is C

What is a Randomized Complete Block Design (RCBD)?
RCBD is one of the most commonly used designs in agricultural experiments.
It is used to control variability when experimental units are not homogeneous.
The field or experiment area is divided into blocks (groups of similar units), and each treatment appears once per block.
✅ Key Features of RCBD:
All treatments appear in every block → Ensures complete comparison within each block.
Randomization is done within each block separately → Treatments are randomly assigned within the block to eliminate bias.
Blocks are homogeneous internally, but different from each other due to known or suspected variation (e.g., slope, fertility gradient).
�� Explanation of Options:
(a) Every block is randomized separately from other blocks ✔️ Correct – Each block undergoes independent randomization.
(b) Every treatment must appear at least once in each block ✔️ Correct – This is what makes the design “complete”.
(c) Each block contains a different set of treatments ❌ Incorrect – In RCBD, each block must contain the same set of treatments, not a different set. This ensures valid comparison.
(d) Treatments are randomized in each block ✔️ Correct – Randomization prevents systematic errors.