Rainfed rice - IRRI books - International Rice Research Institute

RAINFED RICE A SOURCEBOOK OF BEST PRACTICES AND STRATEGIES IN EASTERN INDIA
Required characteristics of entries for MLT
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Superior performance for yield in ST
Desirable agronomic/quality traits
High degree of phenotypic uniformity and genotypic
stability
Known pedigrees/parentages
Types of multi-location trials
Multi-location trials (MLT)
Cooperating breeders conduct multi-
location trials (also known as national
trials). The entries for these trials
come from cooperating breeders of
the crop network and are grouped
according to different ecosystems and
crop duration, i.e., early, medium and
late maturity groups.
The trials are laid out at several
locations, representative of different
agro-climatic zones, identified by the
crop coordinator in consultation with
cooperating institutions.
These trials provide the entries
received from breeders of different
parts of the country the opportunity
to express their potential in varying
sets of environments. They also
enable breeders to identify suitable
varieties and their adaptability
characteristics.
Performance trials
INITIAL EVALUATION TRIALS (IET)
Based on their performance in station trials, entries are selected by
breeders for IET. The number of entries is generally quite large, but,
inclusive of checks, should not exceed 49.
INITIAL VARIETY TRIALS (IVT)
Entries with better performance in yield and/or disease and pest
reactions in IET are promoted to this stage. Besides yield, data on disease
and pest reactions, etc., of the entries under natural conditions are
recorded.
ADVANCED VARIETY TRIALS (AVT)
Based on their performance in the IVT, promising entries are promoted
for testing to AVT. This being the final yield evaluation trial, entries are
tested for at least two seasons in replicated trials.
ADDITIONAL DATA TRIAL (ADT)
For collecting information on agronomy, resistance to biotic stresses and
quality.