Which of the following design is used to test a large number of genotypes in a limited area?

Correct option is B

What is Augmented Design?
An Augmented Design is a special type of experimental layout developed to evaluate a large number of test genotypes, especially when land, seed, or replication is limited.
It is most commonly used in plant breeding programs during early-generation testing or preliminary yield trials.
�� Key Features of Augmented Design:
Unreplicated Test Entries:
New or untested genotypes (entries) are usually not replicated, helping conserve space and resources.
Replicated Checks:
A few well-known standard varieties (checks) are replicated across blocks to adjust for environmental variation.
Useful When:
The number of genotypes is very large.
The area or resources are limited.
Replication is not feasible for all entries.
�� Advantages:
Efficient use of limited land and inputs.
Allows statistical adjustment using the replicated checks.
Ideal for preliminary screening trials.
�� Option-wise Explanation:
(a) Randomized Block Design (RBD) – ❌ Requires replication for all genotypes, not suitable for very large unreplicated trials.
(b) Augmented Design – ✅ Correct, specifically designed for large number of genotypes in limited space.
(c) Latin Square Design – ❌ Controls two sources of variation but requires equal number of rows and columns—inefficient for large unreplicated tests.
(d) Completely Randomized Design (CRD) – ❌ Suitable for homogeneous environments, but impractical for field trials with many genotypes and environmental variation.